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<h3>
Sebastian Graf pushed to branch wip/T18341
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27">42f9bf20</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-08-31T19:19:21+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Handle ⊥ and strict fields correctly (#18341)
In #18341, we discovered an incorrect digression from Lower Your Guards.
This MR changes what's necessary to support properly fixing #18341.
In particular, bottomness constraints are now properly tracked in the
oracle/inhabitation testing, as an additional field
`vi_bot :: Maybe Bool` in `VarInfo`. That in turn allows us to
model newtypes as advertised in the Appendix of LYG and fix #17725.
For some reason I couldn't follow, this also fixes #18273.
I also added a couple of regression tests that were missing. Most of
them were already fixed before.
In summary, this patch fixes #18341, #17725, #18273.
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<h4>27 changed files:</h4>
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<a href="#a5cc2925ca8258af241be7e5b0381edf30266302">
.gitignore
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<a href="#6fcf64907fb5bdd93082d2d1eb94e4566e735865">
compiler/GHC/Core/DataCon.hs
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compiler/GHC/Data/Bag.hs
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compiler/GHC/HsToCore/Binds.hs
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compiler/GHC/HsToCore/Expr.hs
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compiler/GHC/HsToCore/GuardedRHSs.hs
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compiler/GHC/HsToCore/Match.hs
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compiler/GHC/HsToCore/Monad.hs
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compiler/GHC/HsToCore/PmCheck.hs
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compiler/GHC/HsToCore/PmCheck/Oracle.hs
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compiler/GHC/HsToCore/PmCheck/Ppr.hs
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compiler/GHC/HsToCore/PmCheck/Types.hs
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compiler/GHC/HsToCore/PmCheck/Types.hs-boot
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compiler/GHC/Tc/Types.hs
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testsuite/tests/pmcheck/should_compile/T10183.hs
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testsuite/tests/pmcheck/should_compile/T17340.stderr
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testsuite/tests/pmcheck/should_compile/T17378.hs
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testsuite/tests/pmcheck/should_compile/T17729.hs
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testsuite/tests/pmcheck/should_compile/T18273.hs
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testsuite/tests/pmcheck/should_compile/T18341.hs
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testsuite/tests/pmcheck/should_compile/TooManyDeltas.hs
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testsuite/tests/pmcheck/should_compile/TooManyDeltas.stderr
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<a href="#a52966ece03f9e76a93a2c4ea96b9fb25368723d">
testsuite/tests/pmcheck/should_compile/all.T
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<h4>Changes:</h4>
<li id="a5cc2925ca8258af241be7e5b0381edf30266302">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#a5cc2925ca8258af241be7e5b0381edf30266302"><strong>.gitignore</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -232,3 +232,6 @@ ghc.nix/</td>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="plaintext"># Tooling - vscode</span>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="plaintext">.vscode</span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="plaintext"># Tooling - ghcide</span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="plaintext">*.hiedb</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#6fcf64907fb5bdd93082d2d1eb94e4566e735865"><strong>compiler/GHC/Core/DataCon.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -53,7 +53,7 @@ module GHC.Core.DataCon (</td>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Predicates on DataCons</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isNullarySrcDataCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isNullaryRepDataCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTupleDataCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isUnboxedTupleCon</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="55" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isUnboxedSumCon</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC56" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isVanillaDataCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">classDataCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dataConCannotMatch</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isVanillaDataCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">isNewDataCon</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">classDataCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dataConCannotMatch</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">dataConUserTyVarsArePermuted</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isBanged</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isMarkedStrict</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">eqHsBang</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isSrcStrict</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isSrcUnpacked</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">specialPromotedDc</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1477,6 +1477,10 @@ isUnboxedSumCon (MkData {dcRepTyCon = tc}) = isUnboxedSumTyCon tc</td>
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<pre style="margin: 0;"> <span id="LC1477" class="line" lang="haskell"><span class="n" style="color: #333;">isVanillaDataCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC1478" class="line" lang="haskell"><span class="n" style="color: #333;">isVanillaDataCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dcVanilla</span> <span class="n" style="color: #333;">dc</span></span>
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1479
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<pre style="margin: 0;"> <span id="LC1479" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1480" class="line" lang="haskell"><span class="cd">-- | Is this the 'DataCon' of a newtype?</span></span>
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<pre style="margin: 0;">+<span id="LC1481" class="line" lang="haskell"><span class="n" style="color: #333;">isNewDataCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC1482" class="line" lang="haskell"><span class="n" style="color: #333;">isNewDataCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNewTyCon</span> <span class="p">(</span><span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1483" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1484" class="line" lang="haskell"><span class="cd">-- | Should this DataCon be allowed in a type even without -XDataKinds?</span></span>
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<pre style="margin: 0;"> <span id="LC1485" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Currently, only Lifted & Unlifted</span></span>
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<pre style="margin: 0;"> <span id="LC1486" class="line" lang="haskell"><span class="n" style="color: #333;">specialPromotedDc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#2fefe3125c649bc5377b06a7cca18e785855b79c"><strong>compiler/GHC/Data/Bag.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -6,7 +6,7 @@</td>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Bag: an unordered collection with duplicates</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ScopedTypeVariables, CPP, DeriveFunctor #-}</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ScopedTypeVariables, CPP, DeriveFunctor<span class="idiff left right">, TypeFamilies</span> #-}</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Bag</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- abstract type</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -27,9 +27,9 @@ module GHC.Data.Bag (</td>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prelude</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">IsList</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Data</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -333,3 +333,8 @@ instance Traversable Bag where</td>
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="haskell"> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UnitBag</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UnitBag</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="haskell"> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TwoBags</span> <span class="n" style="color: #333;">b1</span> <span class="n" style="color: #333;">b2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TwoBags</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">b1</span> <span class="o" style="font-weight: 600;"><*></span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">b2</span></span>
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<pre style="margin: 0;"> <span id="LC335" class="line" lang="haskell"> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ListBag</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ListBag</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">xs</span></span>
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC337" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">IsList</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Item</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="haskell"> <span class="n" style="color: #333;">fromList</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToBag</span></span>
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<pre style="margin: 0;">+<span id="LC340" class="line" lang="haskell"> <span class="n" style="color: #333;">toList</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bagToList</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#65e2067fbb7377818b6cadff0531f44029499948"><strong>compiler/GHC/HsToCore/Binds.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -184,8 +184,8 @@ dsHsBind dflags b@(FunBind { fun_id = L loc fun</td>
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="haskell"><span class="n" style="color: #333;">dsHsBind</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatBind</span> <span class="p">{</span> <span class="n" style="color: #333;">pat_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pat</span><span class="p">,</span> <span class="n" style="color: #333;">pat_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ticks</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_tick</span><span class="p">,</span> <span class="n" style="color: #333;">var_ticks</span><span class="p">)</span> <span class="p">})</span></span>
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187
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">delt</span>as</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">covCheckGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindGuards</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">body_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGuarded</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">delt</span>as</span></span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">nabl</span>as</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">covCheckGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindGuards</span> <span class="n" style="color: #333;">grhss</span></span>
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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">body_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGuarded</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">nabl</span>as</span></span>
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189
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189
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">body'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkOptTickBox</span> <span class="n" style="color: #333;">rhs_tick</span> <span class="n" style="color: #333;">body_expr</span></span>
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190
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190
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="haskell"> <span class="n" style="color: #333;">pat'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">decideBangHood</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">pat</span></span>
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191
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191
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">force_var</span><span class="p">,</span><span class="n" style="color: #333;">sel_binds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkSelectorBinds</span> <span class="n" style="color: #333;">var_ticks</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">body'</span></span>
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<li id="6bdd5abc649727f2a802bc96ce5c276de19d3726">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#6bdd5abc649727f2a802bc96ce5c276de19d3726"><strong>compiler/GHC/HsToCore/Expr.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -215,8 +215,8 @@ dsUnliftedBind (PatBind {pat_lhs = pat, pat_rhs = grhss</td>
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215
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span> <span class="p">})</span> <span class="n" style="color: #333;">body</span></span>
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- let C x# y# = rhs in body</span></span>
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ==> case rhs of C x# y# -> body</span></span>
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<pre style="margin: 0;">-<span id="LC218" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">match_<span class="idiff left right">delt</span>as</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">covCheckGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindGuards</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">-<span id="LC219" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGuarded</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">match_<span class="idiff left right">delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">match_<span class="idiff left right">nabl</span>as</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">covCheckGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindGuards</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGuarded</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">match_<span class="idiff left right">nabl</span>as</span></span>
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220
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">upat</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">pat</span></span>
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221
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"> <span class="n" style="color: #333;">eqn</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EqnInfo</span> <span class="p">{</span> <span class="n" style="color: #333;">eqn_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">upat</span><span class="p">],</span></span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"> <span class="n" style="color: #333;">eqn_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -486,8 +486,8 @@ dsExpr (HsMultiIf res_ty alts)</td>
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC487" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC488" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">alts</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="n" style="color: #333;">emptyLocalBinds</span><span class="p">)</span></span>
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489
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<pre style="margin: 0;">-<span id="LC489" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">delt</span>as</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">covCheckGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">IfAlt</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">-<span id="LC490" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">IfAlt</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">nabl</span>as</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">covCheckGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">IfAlt</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">+<span id="LC490" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">IfAlt</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">nabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">error_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkErrorExpr</span></span>
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">extractMatchResult</span> <span class="n" style="color: #333;">match_result</span> <span class="n" style="color: #333;">error_expr</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC493" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<li id="83f0b13548ac43fe13b1813fb407249ff9b825f7">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#83f0b13548ac43fe13b1813fb407249ff9b825f7"><strong>compiler/GHC/HsToCore/GuardedRHSs.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -25,7 +25,7 @@ import GHC.Core.Utils (bindNonRec)</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.Utils</span></span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck.Types</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck.Types</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -48,9 +48,9 @@ producing an expression with a runtime error in the corner case if</td>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">necessary. The type argument gives the type of the @ei@.</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC51" class="line" lang="haskell"><span class="n" style="color: #333;">dsGuarded</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="haskell"><span class="n" style="color: #333;">dsGuarded</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">delt</span>as</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC53" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindRhs</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"><span class="n" style="color: #333;">dsGuarded</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="n" style="color: #333;">dsGuarded</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">nabl</span>as</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindRhs</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">nabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"> <span class="n" style="color: #333;">error_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkErrorAppDs</span> <span class="n" style="color: #333;">nON_EXHAUSTIVE_GUARDS_ERROR_ID</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">empty</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"> <span class="n" style="color: #333;">extractMatchResult</span> <span class="n" style="color: #333;">match_result</span> <span class="n" style="color: #333;">error_expr</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -59,28 +59,28 @@ dsGuarded grhss rhs_ty rhss_deltas = do</td>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="n" style="color: #333;">dsGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Guarded RHSs</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Type of RHS</span></span>
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<pre style="margin: 0;">-<span id="LC62" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Refined pattern match checking</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Refined pattern match checking</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- models, one for the pattern part and</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- one for each GRHS.</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MatchResult</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC66" class="line" lang="haskell"><span class="n" style="color: #333;">dsGRHSs</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="haskell"><span class="n" style="color: #333;">dsGRHSs</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">nabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">notNull</span> <span class="n" style="color: #333;">grhss</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC68" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">match_results</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">grhss</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">delt</span>as</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC69" class="line" lang="haskell"> <span class="n" style="color: #333;">zipWithM</span> <span class="p">(</span><span class="n" style="color: #333;">dsGRHS</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">toList</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">delt</span>as</span><span class="p">)</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">-<span id="LC70" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">getPmDelt</span>as</span></span>
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We need to remember the <span class="idiff left right">Delt</span>as from the particular match context we</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">match_results</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">grhss</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">nabl</span>as</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"> <span class="n" style="color: #333;">zipWithM</span> <span class="p">(</span><span class="n" style="color: #333;">dsGRHS</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">toList</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">nabl</span>as</span><span class="p">)</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">getPmNabl</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We need to remember the <span class="idiff left right">Nabl</span>as from the particular match context we</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- are in, which might be different to when dsLocalBinds is actually</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- called.</span></span>
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<pre style="margin: 0;">-<span id="LC74" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ds_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updPm<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>as</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">dsLocalBinds</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ds_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updPm<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>as</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">dsLocalBinds</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr1</span> <span class="n" style="color: #333;">combineMatchResults</span> <span class="n" style="color: #333;">match_results</span></span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adjustMatchResultDs</span> <span class="n" style="color: #333;">ds_binds</span> <span class="n" style="color: #333;">match_result1</span></span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: nested dsLet inside matchResult</span></span>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">match_result2</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC80" class="line" lang="haskell"><span class="n" style="color: #333;">dsGRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"><span class="n" style="color: #333;">dsGRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MatchResult</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC82" class="line" lang="haskell"><span class="n" style="color: #333;">dsGRHS</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhs_<span class="idiff left right">delt</span>as</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHS</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">guards</span> <span class="n" style="color: #333;">rhs</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC83" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">guards</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatGuard</span> <span class="n" style="color: #333;">hs_ctx</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_<span class="idiff left right">delt</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"><span class="n" style="color: #333;">dsGRHS</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhs_<span class="idiff left right">nabl</span>as</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHS</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">guards</span> <span class="n" style="color: #333;">rhs</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">guards</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatGuard</span> <span class="n" style="color: #333;">hs_ctx</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_<span class="idiff left right">nabl</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -92,7 +92,7 @@ dsGRHS hs_ctx rhs_ty rhs_deltas (L _ (GRHS _ guards rhs))</td>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">GuardStmt</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Guard</span></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsStmtContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="c1" style="color: #998; font-style: italic;">-- Context</span></span>
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<pre style="margin: 0;">-<span id="LC95" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span> <span class="c1" style="color: #998; font-style: italic;">-- The RHS's covered set for PmCheck</span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span> <span class="c1" style="color: #998; font-style: italic;">-- The RHS's covered set for PmCheck</span></span>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="c1" style="color: #998; font-style: italic;">-- RHS</span></span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- Type of RHS of guard</span></span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MatchResult</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -100,8 +100,8 @@ matchGuards :: [GuardStmt GhcTc] -- Guard</td>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See comments with HsExpr.Stmt re what a BodyStmt means</span></span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Here we must be in a guard context (not do-expression, nor list-comp)</span></span>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC103" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<pre style="margin: 0;">-<span id="LC104" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">core_rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">updPm<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>as</span> <span class="p">(</span><span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">core_rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">updPm<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>as</span> <span class="p">(</span><span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">cantFailMatchResult</span> <span class="n" style="color: #333;">core_rhs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- BodyStmts must be guards</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -111,31 +111,31 @@ matchGuards [] _ deltas rhs _</td>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: The success of this clause depends on the typechecker not</span></span>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- wrapping the 'otherwise' in empty HsTyApp or HsWrap constructors</span></span>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If it does, you'll get bogus overlap warnings</span></span>
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<pre style="margin: 0;">-<span id="LC114" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BodyStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BodyStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">addTicks</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isTrueLHsExpr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC116" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">adjustMatchResultDs</span> <span class="n" style="color: #333;">addTicks</span> <span class="n" style="color: #333;">match_result</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC118" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BodyStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC119" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BodyStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="haskell"> <span class="n" style="color: #333;">pred_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkGuardedMatchResult</span> <span class="n" style="color: #333;">pred_expr</span> <span class="n" style="color: #333;">match_result</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC123" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LetStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">binds</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC124" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LetStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">binds</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">adjustMatchResultDs</span> <span class="p">(</span><span class="n" style="color: #333;">dsLocalBinds</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span> <span class="n" style="color: #333;">match_result</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB the dsLet occurs inside the match_result</span></span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Reason: dsLet takes the body expression as its argument</span></span>
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so we can't desugar the bindings without the</span></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- body expression in hand</span></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC131" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BindStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">bind_rhs</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BindStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">bind_rhs</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">upat</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">pat</span></span>
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"> <span class="n" style="color: #333;">match_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">selectMatchVar</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">upat</span></span>
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We only allow unrestricted patterns in guard, hence the `Many`</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- above. It isn't clear what linear patterns would mean, maybe we will</span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- figure it out in the future.</span></span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC138" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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139
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="haskell"> <span class="n" style="color: #333;">core_rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">bind_rhs</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">match_var</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">core_rhs</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</span> <span class="n" style="color: #333;">ctx</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">match_result</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#085703923f9c18f6ac9f926ac9a4c7c7e6d9d9ed"><strong>compiler/GHC/HsToCore/Match.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -35,7 +35,7 @@ import GHC.Tc.Utils.Zonk</td>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck</span></span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck.Types</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">initDelt</span>as</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck.Types</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nablas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">initNabl</span>as</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Literal</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Utils</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -766,31 +766,31 @@ matchWrapper ctxt mb_scr (MG { mg_alts = L _ matches</td>
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<pre style="margin: 0;"> <span id="LC766" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">hsLMatchPats</span> <span class="n" style="color: #333;">m</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC767" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Pattern match check warnings for /this match-group/.</span></span>
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<pre style="margin: 0;">-<span id="LC769" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @rhss_<span class="idiff left right">deltas@ is a flat list of covered Delt</span>as for each RHS.</span></span>
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<pre style="margin: 0;">-<span id="LC770" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Each Match will split off one <span class="idiff left right">Delt</span>as for its RHSs from this.</span></span>
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<pre style="margin: 0;">-<span id="LC771" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">matches_<span class="idiff left right">delt</span>as</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isMatchContextPmChecked</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @rhss_<span class="idiff left right">nablas@ is a flat list of covered Nabl</span>as for each RHS.</span></span>
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<pre style="margin: 0;">+<span id="LC770" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Each Match will split off one <span class="idiff left right">Nabl</span>as for its RHSs from this.</span></span>
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">matches_<span class="idiff left right">nabl</span>as</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isMatchContextPmChecked</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;"> <span id="LC772" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">addHsScrutTmCs</span> <span class="n" style="color: #333;">mb_scr</span> <span class="n" style="color: #333;">new_vars</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC773" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Long-distance information]</span></span>
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<pre style="margin: 0;"> <span id="LC774" class="line" lang="haskell"> <span class="n" style="color: #333;">covCheckMatches</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">locn</span><span class="p">)</span> <span class="n" style="color: #333;">new_vars</span> <span class="n" style="color: #333;">matches</span></span>
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<pre style="margin: 0;">-<span id="LC775" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">init<span class="idiff left right">Delt</span>asMatches</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">init<span class="idiff left right">Nabl</span>asMatches</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC776" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC777" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">eqns_info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipWithM</span> <span class="n" style="color: #333;">mk_eqn_info</span> <span class="n" style="color: #333;">matches</span> <span class="n" style="color: #333;">matches_<span class="idiff left right">delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC777" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">eqns_info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipWithM</span> <span class="n" style="color: #333;">mk_eqn_info</span> <span class="n" style="color: #333;">matches</span> <span class="n" style="color: #333;">matches_<span class="idiff left right">nabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC778" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">result_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">handleWarnings</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC780" class="line" lang="haskell"> <span class="n" style="color: #333;">matchEquations</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">new_vars</span> <span class="n" style="color: #333;">eqns_info</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">new_vars</span><span class="p">,</span> <span class="n" style="color: #333;">result_expr</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC782" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC783" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Called once per equation in the match, or alternative in the case</span></span>
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<pre style="margin: 0;">-<span id="LC784" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_eqn_info</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LMatch</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">EquationInfo</span></span>
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<pre style="margin: 0;">-<span id="LC785" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_eqn_info</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Match</span> <span class="p">{</span> <span class="n" style="color: #333;">m_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pats</span><span class="p">,</span> <span class="n" style="color: #333;">m_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span> <span class="p">}))</span> <span class="p">(</span><span class="n" style="color: #333;">pat_<span class="idiff left">deltas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rhss_delt</span>as</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_eqn_info</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LMatch</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nablas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">EquationInfo</span></span>
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_eqn_info</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Match</span> <span class="p">{</span> <span class="n" style="color: #333;">m_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pats</span><span class="p">,</span> <span class="n" style="color: #333;">m_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span> <span class="p">}))</span> <span class="p">(</span><span class="n" style="color: #333;">pat_<span class="idiff left">nablas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rhss_nabl</span>as</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC786" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">upats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">decideBangHood</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;">-<span id="LC788" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pat_<span class="idiff left right">delt</span>as is the covered set *after* matching the pattern, but</span></span>
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<pre style="margin: 0;">-<span id="LC789" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- before any of the GRHSs. We extend the environment with pat_<span class="idiff left right">delt</span>as</span></span>
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<pre style="margin: 0;">-<span id="LC790" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (via updPm<span class="idiff left right">Delt</span>as) so that the where-clause of 'grhss' can profit</span></span>
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<pre style="margin: 0;">+<span id="LC788" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pat_<span class="idiff left right">nabl</span>as is the covered set *after* matching the pattern, but</span></span>
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<pre style="margin: 0;">+<span id="LC789" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- before any of the GRHSs. We extend the environment with pat_<span class="idiff left right">nabl</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (via updPm<span class="idiff left right">Nabl</span>as) so that the where-clause of 'grhss' can profit</span></span>
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<pre style="margin: 0;"> <span id="LC791" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- from that knowledge (#18533)</span></span>
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<pre style="margin: 0;">-<span id="LC792" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">updPm<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pat_delt</span>as</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC793" class="line" lang="haskell"> <span class="n" style="color: #333;">dsGRHSs</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">updPm<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pat_nabl</span>as</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"> <span class="n" style="color: #333;">dsGRHSs</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhss_<span class="idiff left right">nabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC794" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">EqnInfo</span> <span class="p">{</span> <span class="n" style="color: #333;">eqn_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">upats</span></span>
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<pre style="margin: 0;"> <span id="LC795" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eqn_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span></span>
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<pre style="margin: 0;"> <span id="LC796" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eqn_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">match_result</span> <span class="p">}</span> <span class="p">}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -799,14 +799,14 @@ matchWrapper ctxt mb_scr (MG { mg_alts = L _ matches</td>
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<pre style="margin: 0;"> <span id="LC799" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">discardWarningsDs</span></span>
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<pre style="margin: 0;"> <span id="LC800" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;"> <span id="LC801" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC802" class="line" lang="haskell"> <span class="n" style="color: #333;">init<span class="idiff left">DeltasMatches</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LMatch</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcTc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">b</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">[(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span><span class="p">)]</span></span>
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<pre style="margin: 0;">-<span id="LC803" class="line" lang="haskell"> <span class="n" style="color: #333;">init<span class="idiff left right">Delt</span>asMatches</span> <span class="n" style="color: #333;">ms</span></span>
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<pre style="margin: 0;">-<span id="LC804" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">init<span class="idiff left">Deltas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">initDelt</span>asGRHSs</span> <span class="p">(</span><span class="n" style="color: #333;">m_grhss</span> <span class="n" style="color: #333;">m</span><span class="p">)))</span> <span class="n" style="color: #333;">ms</span></span>
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<pre style="margin: 0;">+<span id="LC802" class="line" lang="haskell"> <span class="n" style="color: #333;">init<span class="idiff left">NablasMatches</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LMatch</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcTc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">b</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">[(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span><span class="p">)]</span></span>
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell"> <span class="n" style="color: #333;">init<span class="idiff left right">Nabl</span>asMatches</span> <span class="n" style="color: #333;">ms</span></span>
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<pre style="margin: 0;">+<span id="LC804" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">init<span class="idiff left">Nablas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">initNabl</span>asGRHSs</span> <span class="p">(</span><span class="n" style="color: #333;">m_grhss</span> <span class="n" style="color: #333;">m</span><span class="p">)))</span> <span class="n" style="color: #333;">ms</span></span>
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<pre style="margin: 0;"> <span id="LC805" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC806" class="line" lang="haskell"> <span class="n" style="color: #333;">init<span class="idiff left">DeltasGRHSs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GRHSs</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcTc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">b</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span></span>
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<pre style="margin: 0;">-<span id="LC807" class="line" lang="haskell"> <span class="n" style="color: #333;">init<span class="idiff left right">Delt</span>asGRHSs</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expectJust</span> <span class="s" style="color: #d14;">"GRHSs non-empty"</span></span>
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<pre style="margin: 0;">+<span id="LC806" class="line" lang="haskell"> <span class="n" style="color: #333;">init<span class="idiff left">NablasGRHSs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GRHSs</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcTc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">b</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC807" class="line" lang="haskell"> <span class="n" style="color: #333;">init<span class="idiff left right">Nabl</span>asGRHSs</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expectJust</span> <span class="s" style="color: #d14;">"GRHSs non-empty"</span></span>
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">NEL</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">nonEmpty</span></span>
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<pre style="margin: 0;">-<span id="LC809" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">replicate</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="p">(</span><span class="n" style="color: #333;">grhssGRHSs</span> <span class="n" style="color: #333;">m</span><span class="p">))</span> <span class="n" style="color: #333;">init<span class="idiff left right">Delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC809" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">replicate</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="p">(</span><span class="n" style="color: #333;">grhssGRHSs</span> <span class="n" style="color: #333;">m</span><span class="p">))</span> <span class="n" style="color: #333;">init<span class="idiff left right">Nabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC810" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC811" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC812" class="line" lang="haskell"><span class="n" style="color: #333;">matchEquations</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#c8a27621f82549165d8946ae8e9f467660958059"><strong>compiler/GHC/HsToCore/Monad.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -34,7 +34,7 @@ module GHC.HsToCore.Monad (</td>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DsMetaEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DsMetaVal</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">dsGetMetaEnv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dsLookupMetaEnv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dsExtendMetaEnv</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Getting and setting pattern match oracle states</span></span>
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<pre style="margin: 0;">-<span id="LC37" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">getPm<span class="idiff left">Deltas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">updPmDelt</span>as</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">getPm<span class="idiff left">Nablas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">updPmNabl</span>as</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Get COMPLETE sets of a TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">dsGetCompleteMatches</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -304,7 +304,7 @@ mkDsEnvs dflags mod rdr_env type_env fam_inst_env msg_var cc_st_var</td>
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<pre style="margin: 0;"> <span id="LC304" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC305" class="line" lang="haskell"> <span class="n" style="color: #333;">lcl_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DsLclEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">dsl_meta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyNameEnv</span></span>
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<pre style="margin: 0;"> <span id="LC306" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">dsl_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">real_span</span></span>
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<pre style="margin: 0;">-<span id="LC307" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">dsl_<span class="idiff left">deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">initDelt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">dsl_<span class="idiff left">nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">initNabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC308" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC309" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="p">(</span><span class="n" style="color: #333;">gbl_env</span><span class="p">,</span> <span class="n" style="color: #333;">lcl_env</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC310" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -403,14 +403,14 @@ the @SrcSpan@ being carried around.</td>
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<pre style="margin: 0;"> <span id="LC403" class="line" lang="haskell"><span class="n" style="color: #333;">getGhcModeDs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">GhcMode</span></span>
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<pre style="margin: 0;"> <span id="LC404" class="line" lang="haskell"><span class="n" style="color: #333;">getGhcModeDs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getDynFlags</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ghcMode</span></span>
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<pre style="margin: 0;"> <span id="LC405" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC406" class="line" lang="haskell"><span class="cd">-- | Get the current pattern match oracle state. See 'dsl_<span class="idiff left right">delt</span>as'.</span></span>
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<pre style="margin: 0;">-<span id="LC407" class="line" lang="haskell"><span class="n" style="color: #333;">getPm<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span></span>
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<pre style="margin: 0;">-<span id="LC408" class="line" lang="haskell"><span class="n" style="color: #333;">getPm<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">do</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">getLclEnv</span></span><span class="p"><span class="idiff">;</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">return</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff right">dsl_delt</span>as</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC406" class="line" lang="haskell"><span class="cd">-- | Get the current pattern match oracle state. See 'dsl_<span class="idiff left right">nabl</span>as'.</span></span>
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell"><span class="n" style="color: #333;">getPm<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC408" class="line" lang="haskell"><span class="n" style="color: #333;">getPm<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">do</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">getLclEnv</span></span><span class="p"><span class="idiff">;</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">return</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff right">dsl_nabl</span>as</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="haskell"><span class="cd">-- | Set the pattern match oracle state within the scope of the given action.</span></span>
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<pre style="margin: 0;">-<span id="LC411" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See 'dsl_<span class="idiff left right">delt</span>as'.</span></span>
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<pre style="margin: 0;">-<span id="LC412" class="line" lang="haskell"><span class="n" style="color: #333;">updPm<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC413" class="line" lang="haskell"><span class="n" style="color: #333;">updPm<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">updLclEnv</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dsl_deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>as</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See 'dsl_<span class="idiff left right">nabl</span>as'.</span></span>
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<pre style="margin: 0;">+<span id="LC412" class="line" lang="haskell"><span class="n" style="color: #333;">updPm<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC413" class="line" lang="haskell"><span class="n" style="color: #333;">updPm<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">updLclEnv</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dsl_nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>as</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC414" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC415" class="line" lang="haskell"><span class="n" style="color: #333;">getSrcSpanDs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span></span>
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"><span class="n" style="color: #333;">getSrcSpanDs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLclEnv</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#ac0a6473a902628a18b3a470122e5cc1ce09de14"><strong>compiler/GHC/HsToCore/PmCheck.hs</strong></a>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a. The set of uncovered values, 'cr_uncov'</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- b. And an annotated tree variant (like 'AnnMatch') that captures</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- redundancy and inaccessibility information as 'RedSets' annotations</span></span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Basically the UA function from Section 5.1. The Normalised Refinement<span class="idiff left right"> Types</span></span></span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Nabla are modeled as 'Deltas' and check</span>ed in "GHC.HsToCore.PmCheck.Oracle".</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Basically the UA function from Section 5.1. The Normalised Refinement</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Types 'Nablas' are maintain</span>ed in "GHC.HsToCore.PmCheck.Oracle".</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 3. Collect redundancy information into a 'CIRB' with a 'CIRBCollector' such</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- as 'collectMatch'. Follows the R function from Figure 6 of the paper.</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 4. Format and report uncovered patterns and redundant equations ('CIRB')</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with 'formatReportWarnings'. Basically job of the G function, plus proper</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- pretty printing of the warnings (Section 5.4 of the paper).</span></span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 5. Return '<span class="idiff left right">Delt</span>as' reaching syntactic sub-components for</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 5. Return '<span class="idiff left right">Nabl</span>as' reaching syntactic sub-components for</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Long-distance information]. See Section 4.1 of the paper.</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Checking and printing</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -68,7 +68,6 @@ import GHC.Utils.Misc</td>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Panic</span></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.DataCon</span></span>
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71
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvVar</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">isIdHsWrapper</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -103,7 +102,7 @@ import Data.Coerce</td>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="haskell"><span class="n" style="color: #333;">covCheckPatBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [covCheckPatBind only checks PatBindRhs]</span></span>
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="haskell"><span class="n" style="color: #333;">covCheckPatBind</span> <span class="n" style="color: #333;">ctxt</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindRhs</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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106
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<pre style="margin: 0;">-<span id="LC106" class="line" lang="haskell"> <span class="n" style="color: #333;">missing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPm<span class="idiff left right">Delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"> <span class="n" style="color: #333;">missing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPm<span class="idiff left right">Nabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"> <span class="n" style="color: #333;">pat_bind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">desugarPatBind</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"covCheckPatBind {"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">var</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pat_bind</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">missing</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unCA</span> <span class="p">(</span><span class="n" style="color: #333;">checkPatBind</span> <span class="n" style="color: #333;">pat_bind</span><span class="p">)</span> <span class="n" style="color: #333;">missing</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="111" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -112,17 +111,17 @@ covCheckPatBind ctxt@(DsMatchContext PatBindRhs loc) var p = do</td>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"><span class="n" style="color: #333;">covCheckPatBind</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"><span class="cd">-- | Exhaustive for guard matches, is used for guards in pattern bindings and</span></span>
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<pre style="margin: 0;">-<span id="LC115" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in @MultiIf@ expressions. Returns the '<span class="idiff left right">Delt</span>as' covered by the RHSs.</span></span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in @MultiIf@ expressions. Returns the '<span class="idiff left right">Nabl</span>as' covered by the RHSs.</span></span>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="haskell"><span class="n" style="color: #333;">covCheckGRHSs</span></span>
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Match context, for warning messages</span></span>
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The GRHSs to check</span></span>
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<pre style="margin: 0;">-<span id="LC119" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- ^ Covered 'Delt</span>as' for each RHS, for long</span></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nablas</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- ^ Covered 'Nabl</span>as' for each RHS, for long</span></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- distance info</span></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="haskell"><span class="n" style="color: #333;">covCheckGRHSs</span> <span class="n" style="color: #333;">hs_ctxt</span> <span class="n" style="color: #333;">guards</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">grhss</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">combined_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldl1</span> <span class="n" style="color: #333;">combineSrcSpans</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">getLoc</span> <span class="n" style="color: #333;">grhss</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">hs_ctxt</span> <span class="n" style="color: #333;">combined_loc</span></span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="haskell"> <span class="n" style="color: #333;">matches</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">desugarGRHSs</span> <span class="n" style="color: #333;">combined_loc</span> <span class="n" style="color: #333;">empty</span> <span class="n" style="color: #333;">guards</span></span>
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<pre style="margin: 0;">-<span id="LC125" class="line" lang="haskell"> <span class="n" style="color: #333;">missing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPm<span class="idiff left right">Delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"> <span class="n" style="color: #333;">missing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPm<span class="idiff left right">Nabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"covCheckGRHSs"</span> <span class="p">(</span><span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Guards:"</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -140,7 +139,7 @@ covCheckGRHSs hs_ctxt guards@(GRHSs _ grhss _) = do</td>
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- f _ _ = 3 -- clause with a single, un-guarded RHS</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC143" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns one non-empty '<span class="idiff left right">Delt</span>as' for 1.) each pattern of a 'Match' and 2.)</span></span>
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns one non-empty '<span class="idiff left right">Nabl</span>as' for 1.) each pattern of a 'Match' and 2.)</span></span>
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- each of a 'Match'es 'GRHS' for Note [Long-distance information].</span></span>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Special case: When there are /no matches/, then the functionassumes it</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -150,13 +149,13 @@ covCheckMatches</td>
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Match context, for warnings messages</span></span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Match variables, i.e. x and y above</span></span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LMatch</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ List of matches</span></span>
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<pre style="margin: 0;">-<span id="LC153" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="p"><span class="idiff">)]</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- ^ One covered 'Delt</span>as' per Match and</span></span>
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nablas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="p"><span class="idiff">)]</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- ^ One covered 'Nabl</span>as' per Match and</span></span>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GRHS, for long distance info.</span></span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"><span class="n" style="color: #333;">covCheckMatches</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">matches</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We have to force @missing@ before printing out the trace message,</span></span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- otherwise we get interleaved output from the solver. This function</span></span>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- should be strict in @missing@ anyway!</span></span>
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">missing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPm<span class="idiff left right">Delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">missing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPm<span class="idiff left right">Nabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC159" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"covCheckMatches {"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">vars</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Matches:"</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -207,7 +206,7 @@ exception into divergence (@f x = f x@).</td>
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Semantically, unlike every other case expression, -XEmptyCase is strict in its</span></span>
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">match var x, which rules out ⊥ as an inhabitant. So we add x /~ ⊥ to the</span></span>
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<pre style="margin: 0;">-<span id="LC210" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">initial <span class="idiff left right">Delt</span>a and check if there are any values left to match on.</span></span>
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">initial <span class="idiff left right">Nabl</span>a and check if there are any values left to match on.</span></span>
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -233,8 +232,8 @@ data PmGrd</td>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bang pattern, in which case we might want to report it as redundant.</span></span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Dead bang patterns].</span></span>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmBang</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC236" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_id</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC237" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">pm_loc</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_id</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">_pm_loc</span></span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC237" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC238" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | @PmLet x expr@ corresponds to a @let x = expr@ guard. This actually</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -298,15 +297,15 @@ newtype GrdPatBind =</td>
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (later digested into a 'CIRB').</span></span>
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span></span>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span></span>
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<pre style="margin: 0;">-<span id="LC301" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC301" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The /Covered/ set; the set of values reaching a particular program</span></span>
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<pre style="margin: 0;"> <span id="LC302" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- point.</span></span>
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<pre style="margin: 0;">-<span id="LC304" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rs_div</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rs_div</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC304" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The /Diverging/ set; empty if no match can lead to divergence.</span></span>
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<pre style="margin: 0;"> <span id="LC305" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If it wasn't empty, we have to turn redundancy warnings into</span></span>
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<pre style="margin: 0;"> <span id="LC306" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inaccessibility warnings for any subclauses.</span></span>
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<pre style="margin: 0;">-<span id="LC308" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rs_bangs</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC309" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ If any of the '<span class="idiff left right">Delt</span>as' is empty, the corresponding 'SrcInfo' pin-points</span></span>
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rs_bangs</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ If any of the '<span class="idiff left right">Nabl</span>as' is empty, the corresponding 'SrcInfo' pin-points</span></span>
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<pre style="margin: 0;"> <span id="LC309" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a bang pattern in source that is redundant. See Note [Dead bang patterns].</span></span>
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<pre style="margin: 0;"> <span id="LC310" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC311" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -434,7 +433,7 @@ vanillaConGrd scrut con arg_ids =</td>
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<pre style="margin: 0;"> <span id="LC433" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For example:</span></span>
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<pre style="margin: 0;"> <span id="LC434" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @mkListGrds "a" "[(x, True <- x),(y, !y)]"@</span></span>
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<pre style="margin: 0;"> <span id="LC435" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to</span></span>
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<pre style="margin: 0;">-<span id="LC437" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @"[(x:b) <- a, True <- x, (y:c) <- b, <span class="idiff left right">seq y True</span>, [] <- c]"@</span></span>
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<pre style="margin: 0;">+<span id="LC436" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @"[(x:b) <- a, True <- x, (y:c) <- b, <span class="idiff left right">!y</span>, [] <- c]"@</span></span>
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- where @b@ and @c@ are freshly allocated in @mkListGrds@ and @a@ is the match</span></span>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variable.</span></span>
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<pre style="margin: 0;"> <span id="LC439" class="line" lang="haskell"><span class="n" style="color: #333;">mkListGrds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GrdVec</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">GrdVec</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -618,7 +617,7 @@ desugarListPat x pats = do</td>
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<pre style="margin: 0;"> <span id="LC617" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC618" class="line" lang="haskell"><span class="cd">-- | Desugar a constructor pattern</span></span>
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"><span class="n" style="color: #333;">desugarConPatOut</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC621" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">EvVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsConPatDetails</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">GrdVec</span></span>
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<pre style="margin: 0;">+<span id="LC620" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">EvVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsConPatDetails</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">GrdVec</span></span>
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<pre style="margin: 0;"> <span id="LC621" class="line" lang="haskell"><span class="n" style="color: #333;">desugarConPatOut</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">univ_tys</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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<pre style="margin: 0;"> <span id="LC622" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PrefixCon</span> <span class="n" style="color: #333;">ps</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go_field_pats</span> <span class="p">(</span><span class="n" style="color: #333;">zip</span> <span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">..</span><span class="p">]</span> <span class="n" style="color: #333;">ps</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC623" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">InfixCon</span> <span class="n" style="color: #333;">p1</span> <span class="n" style="color: #333;">p2</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go_field_pats</span> <span class="p">(</span><span class="n" style="color: #333;">zip</span> <span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">..</span><span class="p">]</span> <span class="p">[</span><span class="n" style="color: #333;">p1</span><span class="p">,</span><span class="n" style="color: #333;">p2</span><span class="p">])</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -638,14 +637,14 @@ desugarConPatOut x con univ_tys ex_tvs dicts = \case</td>
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<pre style="margin: 0;"> <span id="LC637" class="line" lang="haskell"> <span class="n" style="color: #333;">lbl_to_index</span> <span class="n" style="color: #333;">lbl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expectJust</span> <span class="s" style="color: #d14;">"lbl_to_index"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">elemIndex</span> <span class="n" style="color: #333;">lbl</span> <span class="n" style="color: #333;">orig_lbls</span></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"> <span class="n" style="color: #333;">go_field_pats</span> <span class="n" style="color: #333;">tagged_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC641" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The fields that appear might not be in the correct order. So<span class="idiff left right"> first</span></span></span>
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<pre style="margin: 0;">-<span id="LC642" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">do a PmCon match, then force according to field strictness and then</span></span></span>
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<pre style="margin: 0;">-<span id="LC643" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">force evaluation of the field patterns in the order given by</span></span></span>
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<pre style="margin: 0;">-<span id="LC644" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">the first</span> field of @tagged_pats@.</span></span>
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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The fields that appear might not be in the correct order. So</span></span>
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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right"> 1. Do the PmCon match</span></span></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right"> 2. Then pattern match on the fields in the order given by the first</span></span></span>
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<pre style="margin: 0;">+<span id="LC643" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right"> </span> field of @tagged_pats@.</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Field match order for RecCon]</span></span>
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<pre style="margin: 0;"> <span id="LC645" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC646" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Desugar the mentioned field patterns. We're doing this first to get</span></span>
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<pre style="margin: 0;">-<span id="LC648" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the Ids for pm_con_args.</span></span>
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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the Ids for pm_con_args<span class="idiff left right"> and bring them in order afterwards</span>.</span></span>
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<pre style="margin: 0;"> <span id="LC648" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">trans_pat</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="p">,</span> <span class="n" style="color: #333;">pat</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC649" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">var</span><span class="p">,</span> <span class="n" style="color: #333;">pvec</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">desugarLPatV</span> <span class="n" style="color: #333;">pat</span></span>
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<pre style="margin: 0;"> <span id="LC650" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">((</span><span class="n" style="color: #333;">n</span><span class="p">,</span> <span class="n" style="color: #333;">var</span><span class="p">),</span> <span class="n" style="color: #333;">pvec</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -659,19 +658,11 @@ desugarConPatOut x con univ_tys ex_tvs dicts = \case</td>
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<pre style="margin: 0;"> <span id="LC658" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_ids</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipWithM</span> <span class="n" style="color: #333;">get_pat_id</span> <span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">..</span><span class="p">]</span> <span class="n" style="color: #333;">arg_tys</span></span>
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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">con_grd</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmCon</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">arg_ids</span></span>
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<pre style="margin: 0;"> <span id="LC660" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC662" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2. bang strict fields</span></span>
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<pre style="margin: 0;">-<span id="LC663" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">arg_is_banged</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">isBanged</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">conLikeImplBangs</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;">-<span id="LC664" class="line" lang="haskell"> <span class="n" style="color: #333;">noSrcPmBang</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmBang</span> <span class="p">{</span><span class="n" style="color: #333;">pm_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">i</span><span class="p">,</span> <span class="n" style="color: #333;">pm_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC665" class="line" lang="haskell"> <span class="n" style="color: #333;">bang_grds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">noSrcPmBang</span> <span class="p">(</span><span class="n" style="color: #333;">filterByList</span> <span class="n" style="color: #333;">arg_is_banged</span> <span class="n" style="color: #333;">arg_ids</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC666" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC667" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 3. guards from field selector patterns</span></span>
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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2. guards from field selector patterns</span></span>
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<pre style="margin: 0;"> <span id="LC662" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">arg_grds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">concat</span> <span class="n" style="color: #333;">arg_grdss</span></span>
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<pre style="margin: 0;"> <span id="LC663" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC664" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tracePm "ConPatOut" (ppr x $$ ppr con $$ ppr arg_ids)</span></span>
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<pre style="margin: 0;">-<span id="LC671" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC672" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Store the guards in exactly that order</span></span>
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<pre style="margin: 0;">-<span id="LC673" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. 2. 3.</span></span>
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<pre style="margin: 0;">-<span id="LC674" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">con_grd</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">bang_grds</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">arg_grds</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC665" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">con_grd</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">arg_grds</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC666" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC667" class="line" lang="haskell"><span class="n" style="color: #333;">desugarPatBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">GrdPatBind</span></span>
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<pre style="margin: 0;"> <span id="LC668" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See 'GrdPatBind' for how this simply repurposes GrdGRHS.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -759,30 +750,45 @@ desugarBoolGuard e</td>
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<pre style="margin: 0;"> <span id="LC750" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">[</span><span class="n" style="color: #333;">vanillaConGrd</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">trueDataCon</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC751" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC752" class="line" lang="haskell"> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkPmId</span> <span class="n" style="color: #333;">boolTy</span></span>
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<pre style="margin: 0;">-<span id="LC762" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;"><span class="idiff left">$</span></span><span class="idiff right"> </span><span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmLet</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">rhs</span><span class="p">,</span> <span class="n" style="color: #333;">vanillaConGrd</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">trueDataCon</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC753" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmLet</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">rhs</span><span class="p">,</span> <span class="n" style="color: #333;">vanillaConGrd</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">trueDataCon</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC754" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC755" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Field match order for RecCon]</span></span>
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<pre style="margin: 0;"> <span id="LC756" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC757" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The order for RecCon field patterns actually determines evaluation order of</span></span>
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<pre style="margin: 0;"> <span id="LC758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the pattern match. For example:</span></span>
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<pre style="margin: 0;"> <span id="LC759" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC769" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = T { a :: <span class="idiff left right">!Bool, b :: Char, c</span> :: Int }</span></span>
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<pre style="margin: 0;">+<span id="LC760" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = T { a :: <span class="idiff left right">Char, b</span> :: Int }</span></span>
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761
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<pre style="margin: 0;"> <span id="LC761" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: T -> ()</span></span>
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<pre style="margin: 0;">-<span id="LC771" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f T{ c = 42, b = 'b' } = ()</span></span>
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f T{ b = 42, a = 'a' } = ()</span></span>
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then @f (T (error "a") (error "b"))@ errors out with "b" because it is mentioned</span></span>
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<pre style="margin: 0;">+<span id="LC765" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">first in the pattern match.</span></span>
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<pre style="margin: 0;"> <span id="LC766" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then</span></span>
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<pre style="margin: 0;">-<span id="LC774" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * @f (T (error "a") (error "b") (error "c"))@ errors out with "a" because of</span></span>
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<pre style="margin: 0;">-<span id="LC775" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the strict field.</span></span>
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<pre style="margin: 0;">-<span id="LC776" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * @f (T True (error "b") (error "c"))@ errors out with "c" because it</span></span>
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<pre style="margin: 0;">-<span id="LC777" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is mentioned frist in the pattern match.</span></span>
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This means we can't just desugar the pattern match to</span></span>
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@[T a b <- x, 'a' <- a, 42 <- b]@. Instead we have to force them in the</span></span>
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">right order: @[T a b <- x, 42 <- b, 'a' <- a]@.</span></span>
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC779" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This means we can't just desugar the pattern match to the PatVec</span></span>
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<pre style="margin: 0;">-<span id="LC780" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@[T !_ 'b' 42]@. Instead we have to generate variable matches that have</span></span>
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<pre style="margin: 0;">-<span id="LC781" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">strictness according to the field declarations and afterwards force them in the</span></span>
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<pre style="margin: 0;">-<span id="LC782" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">right order. As a result, we get the PatVec @[T !_ b c, 42 <- c, 'b' <- b]@.</span></span>
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Strict fields and fields of unlifted type]</span></span>
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How do strict fields play into Note [Field match order for RecCon]? Answer:</span></span>
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">They don't. Desugaring is entirely unconcerned by strict fields; the forcing</span></span>
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">happens *before* pattern matching. But for each strict (or more generally,</span></span>
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<pre style="margin: 0;">+<span id="LC776" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unlifted) field @s@ we have to add @s /~ ⊥@ constraints when we check the PmCon</span></span>
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<pre style="margin: 0;">+<span id="LC777" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">guard in 'checkGrd'. Strict fields are devoid of ⊥ by construction, there's</span></span>
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">nothing that a bang pattern would act on. Example from #18341:</span></span>
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<pre style="margin: 0;">+<span id="LC779" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC780" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = MkT !Int</span></span>
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<pre style="margin: 0;">+<span id="LC781" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: T -> ()</span></span>
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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (MkT _) | False = () -- inaccessible</span></span>
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (MkT !_) | False = () -- redundant, not only inaccessible!</span></span>
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f _ = ()</span></span>
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<pre style="margin: 0;"> <span id="LC785" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Of course, when the labels occur in the order they are defined, we can just use</span></span>
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<pre style="margin: 0;">-<span id="LC785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the simpler desugaring.</span></span>
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<pre style="margin: 0;">+<span id="LC786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The second clause desugars to @MkT n <- x, !n@. When coverage checked, the</span></span>
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<pre style="margin: 0;">+<span id="LC787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'PmCon' @MkT n <- x@ refines the set of values that reach the bang pattern with</span></span>
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<pre style="margin: 0;">+<span id="LC788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the constraints @x ~ MkT n, n /~ ⊥@ (this list is computed by 'pmConCts').</span></span>
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<pre style="margin: 0;">+<span id="LC789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Checking the 'PmBang' @!n@ will then try to add the constraint @n ~ ⊥@ to this</span></span>
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">set to get the diverging set, which is found to be empty. Hence the whole</span></span>
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">clause is detected as redundant, as expected.</span></span>
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<pre style="margin: 0;"> <span id="LC792" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC793" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Order of guards matters]</span></span>
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<pre style="margin: 0;"> <span id="LC794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -834,7 +840,7 @@ data CheckResult a</td>
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span></span>
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835
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841
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">a</span></span>
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842
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A hole for redundancy info and covered sets.</span></span>
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837
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<pre style="margin: 0;">-<span id="LC837" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC843" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The set of uncovered values falling out at the bottom.</span></span>
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (for -Wincomplete-patterns, but also important state for the algorithm)</span></span>
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<pre style="margin: 0;"> <span id="LC846" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Precision</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -852,23 +858,23 @@ instance Outputable a => Outputable (CheckResult a) where</td>
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_precision</span> <span class="kt" style="color: #458; font-weight: 600;">Approximate</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(Approximate)"</span></span>
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859
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"> <span class="n" style="color: #333;">field</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">value</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">equals</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">value</span></span>
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC855" class="line" lang="haskell"><span class="cd">-- | Lift 'addPmCts' over '<span class="idiff left right">Delt</span>as'.</span></span>
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<pre style="margin: 0;">-<span id="LC856" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCts<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmCts</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span></span>
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<pre style="margin: 0;">-<span id="LC857" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCts<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cts</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">liftDeltasM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff">d</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addPmCts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">d</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cts</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC861" class="line" lang="haskell"><span class="cd">-- | Lift 'addPmCts' over '<span class="idiff left right">Nabl</span>as'.</span></span>
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCts<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmCts</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCts<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cts</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">liftNablasM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff">d</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addPmCts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">d</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cts</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC859" class="line" lang="haskell"><span class="cd">-- | 'addPmCts<span class="idiff left right">Delt</span>as' for a single 'PmCt'.</span></span>
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<pre style="margin: 0;">-<span id="LC860" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCt<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmCt</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span></span>
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<pre style="margin: 0;">-<span id="LC861" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCt<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addPmCtsDeltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>as</span> <span class="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC865" class="line" lang="haskell"><span class="cd">-- | 'addPmCts<span class="idiff left right">Nabl</span>as' for a single 'PmCt'.</span></span>
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<pre style="margin: 0;">+<span id="LC866" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCt<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmCt</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC867" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCt<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addPmCtsNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>as</span> <span class="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC863" class="line" lang="haskell"><span class="cd">-- | Test if any of the '<span class="idiff left right">Delt</span>a's is inhabited. Currently this is pure, because</span></span>
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<pre style="margin: 0;">-<span id="LC864" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we preserve the invariant that there are no uninhabited '<span class="idiff left right">Delt</span>a's. But that</span></span>
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<pre style="margin: 0;">+<span id="LC869" class="line" lang="haskell"><span class="cd">-- | Test if any of the '<span class="idiff left right">Nabl</span>a's is inhabited. Currently this is pure, because</span></span>
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<pre style="margin: 0;">+<span id="LC870" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we preserve the invariant that there are no uninhabited '<span class="idiff left right">Nabl</span>a's. But that</span></span>
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- could change in the future, for example by implementing this function in</span></span>
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<pre style="margin: 0;"> <span id="LC872" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- terms of @notNull <$> provideEvidence 1 ds@.</span></span>
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<pre style="margin: 0;">-<span id="LC867" class="line" lang="haskell"><span class="n" style="color: #333;">isInhabited</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC868" class="line" lang="haskell"><span class="n" style="color: #333;">isInhabited</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left right">Delt</span>as</span> <span class="n" style="color: #333;">ds</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">ds</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC873" class="line" lang="haskell"><span class="n" style="color: #333;">isInhabited</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"><span class="n" style="color: #333;">isInhabited</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left right">Nabl</span>as</span> <span class="n" style="color: #333;">ds</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">ds</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC875" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC876" class="line" lang="haskell"><span class="cd">-- | Coverage checking action. Can be composed 'leftToRight' or 'topToBottom'.</span></span>
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<pre style="margin: 0;">-<span id="LC871" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="p">{</span> <span class="n" style="color: #333;">unCA</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="p">{</span> <span class="n" style="color: #333;">unCA</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC878" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Functor</span></span>
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC880" class="line" lang="haskell"><span class="cd">-- | Composes 'CheckAction's top-to-bottom:</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -910,23 +916,34 @@ leftToRight f (CA left) (CA right) = CA $ \inc -> do</td>
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<pre style="margin: 0;"> <span id="LC916" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uncov'</span></span>
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">prec'</span> <span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">cr_approx</span> <span class="n" style="color: #333;">l</span> <span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">cr_approx</span> <span class="n" style="color: #333;">r</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC918" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC913" class="line" lang="haskell"><span class="cd">-- | @throttle limit old new@ returns @old@ if the number of '<span class="idiff left right">Delt</span>a's in @new@</span></span>
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<pre style="margin: 0;">-<span id="LC914" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- is exceeding the given @limit@ and the @old@ number of '<span class="idiff left right">Delt</span>a's.</span></span>
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<pre style="margin: 0;">+<span id="LC919" class="line" lang="haskell"><span class="cd">-- | @throttle limit old new@ returns @old@ if the number of '<span class="idiff left right">Nabl</span>a's in @new@</span></span>
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<pre style="margin: 0;">+<span id="LC920" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- is exceeding the given @limit@ and the @old@ number of '<span class="idiff left right">Nabl</span>a's.</span></span>
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<pre style="margin: 0;"> <span id="LC921" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Countering exponential blowup].</span></span>
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<pre style="margin: 0;">-<span id="LC916" class="line" lang="haskell"><span class="n" style="color: #333;">throttle</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Precision</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC917" class="line" lang="haskell"><span class="n" style="color: #333;">throttle</span> <span class="n" style="color: #333;">limit</span> <span class="n" style="color: #333;">old</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">old_ds</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">new</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MkDelt</span>as</span> <span class="n" style="color: #333;">new_ds</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC922" class="line" lang="haskell"><span class="n" style="color: #333;">throttle</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Precision</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC923" class="line" lang="haskell"><span class="n" style="color: #333;">throttle</span> <span class="n" style="color: #333;">limit</span> <span class="n" style="color: #333;">old</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">old_ds</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">new</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MkNabl</span>as</span> <span class="n" style="color: #333;">new_ds</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC924" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--- | pprTrace "PmCheck:throttle" (ppr (length old_ds) <+> ppr (length new_ds) <+> ppr limit) False = undefined</span></span>
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<pre style="margin: 0;"> <span id="LC925" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">new_ds</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">max</span> <span class="n" style="color: #333;">limit</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">old_ds</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Approximate</span><span class="p">,</span> <span class="n" style="color: #333;">old</span><span class="p">)</span></span>
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920
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926
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<pre style="margin: 0;"> <span id="LC926" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Precise</span><span class="p">,</span> <span class="n" style="color: #333;">new</span><span class="p">)</span></span>
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921
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927
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC922" class="line" lang="haskell"><span class="cd">-- | Matching on a newtype doesn't force anything.</span></span>
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923
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<pre style="margin: 0;">-<span id="LC923" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Divergence of Newtype matches] in "GHC.HsToCore.PmCheck.Oracle".</span></span>
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924
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<pre style="margin: 0;">-<span id="LC924" class="line" lang="haskell"><span class="n" style="color: #333;">conMatchForces</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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925
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<pre style="margin: 0;">-<span id="LC925" class="line" lang="haskell"><span class="n" style="color: #333;">conMatchForces</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">))</span></span>
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926
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<pre style="margin: 0;">-<span id="LC926" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNewTyCon</span> <span class="p">(</span><span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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927
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<pre style="margin: 0;">-<span id="LC927" class="line" lang="haskell"><span class="n" style="color: #333;">conMatchForces</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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928
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<pre style="margin: 0;">-<span id="LC928" class="line" lang="haskell"></span>
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929
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<pre style="margin: 0;">-<span id="LC929" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- First the functions that correspond to checking LYG primitives:</span></span>
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<pre style="margin: 0;">+<span id="LC928" class="line" lang="haskell"><span class="cd">-- | The 'PmCts' arising from a successful 'PmCon' match @T gammas as ys <- x@.</span></span>
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929
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<pre style="margin: 0;">+<span id="LC929" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- These include</span></span>
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<pre style="margin: 0;">+<span id="LC930" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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931
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<pre style="margin: 0;">+<span id="LC931" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @gammas@: Constraints arising from the bound evidence vars</span></span>
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932
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<pre style="margin: 0;">+<span id="LC932" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @y /~ ⊥@ constraints for each unlifted field (including strict fields)</span></span>
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933
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<pre style="margin: 0;">+<span id="LC933" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @y@ in @ys@</span></span>
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<pre style="margin: 0;">+<span id="LC934" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * The constructor constraint itself: @x ~ T as ys@.</span></span>
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935
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<pre style="margin: 0;">+<span id="LC935" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC936" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Strict fields and fields of unlifted type].</span></span>
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937
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<pre style="margin: 0;">+<span id="LC937" class="line" lang="haskell"><span class="n" style="color: #333;">pmConCts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">EvVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmCts</span></span>
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"><span class="n" style="color: #333;">pmConCts</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gammas</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">unlifted</span> <span class="p">`</span><span class="n" style="color: #333;">snocBag</span><span class="p">`</span> <span class="n" style="color: #333;">con_ct</span></span>
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<pre style="margin: 0;">+<span id="LC939" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC940" class="line" lang="haskell"> <span class="n" style="color: #333;">gammas</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToBag</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmTyCt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">evVarPred</span><span class="p">)</span> <span class="n" style="color: #333;">dicts</span></span>
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<pre style="margin: 0;">+<span id="LC941" class="line" lang="haskell"> <span class="n" style="color: #333;">con_ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC942" class="line" lang="haskell"> <span class="n" style="color: #333;">unlifted</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToBag</span> <span class="p">[</span> <span class="kt" style="color: #458; font-weight: 600;">PmNotBotCt</span> <span class="n" style="color: #333;">arg</span></span>
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">arg</span><span class="p">,</span> <span class="n" style="color: #333;">bang</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span></span>
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<pre style="margin: 0;">+<span id="LC944" class="line" lang="haskell"> <span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"pmConCts"</span> <span class="n" style="color: #333;">args</span> <span class="p">(</span><span class="n" style="color: #333;">pmAltConImplBangs</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC945" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isBanged</span> <span class="n" style="color: #333;">bang</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isUnliftedType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell"> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC947" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC948" class="line" lang="haskell"><span class="n" style="color: #333;">checkSequence</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">grdtree</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="n" style="color: #333;">anntree</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="n" style="color: #333;">grdtree</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="n" style="color: #333;">anntree</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC949" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The implementation is pretty similar to</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -939,31 +956,32 @@ checkGrd :: PmGrd -> CheckAction RedSets</td>
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<pre style="margin: 0;"> <span id="LC956" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrd</span> <span class="n" style="color: #333;">grd</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">inc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">grd</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC957" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- let x = e: Refine with x ~ e</span></span>
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<pre style="margin: 0;"> <span id="LC958" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmLet</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC942" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmCoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC959" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtNablas</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmCoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tracePm "check:Let" (ppr x <+> char '=' <+> ppr e)</span></span>
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<pre style="margin: 0;"> <span id="LC961" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyRedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matched</span> <span class="p">}</span></span>
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944
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962
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<pre style="margin: 0;"> <span id="LC962" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span></span>
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945
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963
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<pre style="margin: 0;"> <span id="LC963" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Precise</span> <span class="p">}</span></span>
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946
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964
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<pre style="margin: 0;"> <span id="LC964" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Bang x _: Diverge on x ~ ⊥, refine with x /~ ⊥</span></span>
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947
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965
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<pre style="margin: 0;"> <span id="LC965" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmBang</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">mb_info</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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948
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<pre style="margin: 0;">-<span id="LC948" class="line" lang="haskell"> <span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCt<span class="idiff left right">Delt</span>as</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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949
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<pre style="margin: 0;">-<span id="LC949" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCt<span class="idiff left right">Delt</span>as</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNotBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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966
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<pre style="margin: 0;">+<span id="LC966" class="line" lang="haskell"> <span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCt<span class="idiff left right">Nabl</span>as</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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967
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<pre style="margin: 0;">+<span id="LC967" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCt<span class="idiff left right">Nabl</span>as</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNotBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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950
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968
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<pre style="margin: 0;"> <span id="LC968" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Dead bang patterns]</span></span>
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951
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969
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<pre style="margin: 0;"> <span id="LC969" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- mb_info = Just info <==> PmBang originates from bang pattern in source</span></span>
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952
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970
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<pre style="margin: 0;"> <span id="LC970" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">bangs</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mb_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitOL</span> <span class="p">(</span><span class="n" style="color: #333;">div</span><span class="p">,</span> <span class="n" style="color: #333;">info</span><span class="p">)</span></span>
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953
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971
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<pre style="margin: 0;"> <span id="LC971" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NilOL</span></span>
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972
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<pre style="margin: 0;">+<span id="LC972" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tracePm "check:Bang" (ppr x <+> ppr div)</span></span>
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954
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973
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<pre style="margin: 0;"> <span id="LC973" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matched</span><span class="p">,</span> <span class="n" style="color: #333;">rs_div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">div</span><span class="p">,</span> <span class="n" style="color: #333;">rs_bangs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bangs</span> <span class="p">}</span></span>
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955
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974
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<pre style="margin: 0;"> <span id="LC974" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span></span>
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956
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975
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<pre style="margin: 0;"> <span id="LC975" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Precise</span> <span class="p">}</span></span>
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957
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<pre style="margin: 0;">-<span id="LC957" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Con: Diverge on x ~ ⊥, fall through on x /~ K and refine with x ~ K ys</span></span>
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958
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<pre style="margin: 0;">-<span id="LC958" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and type info</span></span>
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976
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<pre style="margin: 0;">+<span id="LC976" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Con: Fall through on x /~ K and refine with x ~ K ys and type info</span></span>
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959
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977
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<pre style="margin: 0;"> <span id="LC977" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmCon</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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960
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<pre style="margin: 0;">-<span id="LC960" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">div</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">if</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">conMatchForces</span></span> <span class="n" style="color: #333;">con</span></span>
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961
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<td class="diff-line-num new_line old" data-linenumber="978" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC961" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">addPmCt<span class="idiff left right">Delt</span>as</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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978
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">!</span></span><span class="n" style="color: #333;"><span class="idiff">div</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">if</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">isPmAltConMatchStrict</span></span> <span class="n" style="color: #333;">con</span></span>
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<td class="diff-line-num new new_line" data-linenumber="979" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
979
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<pre style="margin: 0;">+<span id="LC979" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">addPmCt<span class="idiff left right">Nabl</span>as</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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962
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980
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<pre style="margin: 0;"> <span id="LC980" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">mempty</span></span>
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963
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<pre style="margin: 0;">-<span id="LC963" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">uncov</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addPmCtDeltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmNotConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">con</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<td class="diff-line-num old old_line" data-linenumber="964" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
964
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<pre style="margin: 0;">-<span id="LC964" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">matched</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addPmCtsDeltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">$</span></span></span>
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965
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<pre style="margin: 0;">-<span id="LC965" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">listToBag</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmTyCt</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">evVarPred</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><$></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dicts</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">snocBag</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">con</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tvs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">args</span></span></span>
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966
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<td class="diff-line-num new_line old" data-linenumber="981" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC966" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tracePm "checkGrd:Con" (ppr inc $$ ppr <span class="idiff left right">x $$ ppr con $$ ppr di</span>cts $$ ppr matched)</span></span>
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981
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<pre style="margin: 0;">+<span id="LC981" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left">let</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">con_cts</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pmConCts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">con</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tvs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dicts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">args</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="982" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
982
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<pre style="margin: 0;">+<span id="LC982" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">!</span></span><span class="n" style="color: #333;"><span class="idiff">matched</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addPmCtsNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">con_cts</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="983" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
983
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<pre style="margin: 0;">+<span id="LC983" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">!</span></span><span class="n" style="color: #333;"><span class="idiff">uncov</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addPmCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmNotConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">con</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="984" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
984
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<pre style="margin: 0;">+<span id="LC984" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tracePm "checkGrd:Con" (ppr inc $$ ppr <span class="idiff left right">grd $$ ppr con_</span>cts $$ ppr matched)</span></span>
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967
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985
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<pre style="margin: 0;"> <span id="LC985" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyRedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matched</span><span class="p">,</span> <span class="n" style="color: #333;">rs_div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">div</span> <span class="p">}</span></span>
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968
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986
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<pre style="margin: 0;"> <span id="LC986" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uncov</span></span>
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969
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987
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<pre style="margin: 0;"> <span id="LC987" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Precise</span> <span class="p">}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -997,7 +1015,7 @@ checkGRHS (GrdGRHS { gg_grds = grds, gg_rhs = rhs_info }) =</td>
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1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"><span class="n" style="color: #333;">checkEmptyCase</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GrdEmptyCase</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="kt" style="color: #458; font-weight: 600;">AnnEmptyCase</span></span>
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1017
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="haskell"><span class="n" style="color: #333;">checkEmptyCase</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GrdEmptyCase</span> <span class="p">{</span> <span class="n" style="color: #333;">ge_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">var</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">inc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC1000" class="line" lang="haskell"> <span class="n" style="color: #333;">unc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCt<span class="idiff left right">Delt</span>as</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNotBotCt</span> <span class="n" style="color: #333;">var</span><span class="p">)</span></span>
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1018
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"> <span class="n" style="color: #333;">unc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCt<span class="idiff left right">Nabl</span>as</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNotBotCt</span> <span class="n" style="color: #333;">var</span><span class="p">)</span></span>
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1001
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1019
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AnnEmptyCase</span><span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unc</span><span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span> <span class="p">}</span></span>
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1002
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"></span>
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1003
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"><span class="n" style="color: #333;">checkPatBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GrdPatBind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="kt" style="color: #458; font-weight: 600;">AnnPatBind</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1007,7 +1025,7 @@ checkPatBind = coerce checkGRHS</td>
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1026
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Precise pattern match exhaustiveness checking is necessarily exponential in</span></span>
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1009
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1027
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<pre style="margin: 0;"> <span id="LC1027" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the size of some input programs. We implement a counter-measure in the form of</span></span>
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1010
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<pre style="margin: 0;">-<span id="LC1010" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the -fmax-pmcheck-models flag, limiting the number of <span class="idiff left right">Delt</span>as we check against</span></span>
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1028
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<pre style="margin: 0;">+<span id="LC1028" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the -fmax-pmcheck-models flag, limiting the number of <span class="idiff left right">Nabl</span>as we check against</span></span>
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1011
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1029
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<pre style="margin: 0;"> <span id="LC1029" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">each pattern by a constant.</span></span>
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1012
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1030
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<pre style="margin: 0;"> <span id="LC1030" class="line" lang="haskell"></span>
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1013
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1031
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<pre style="margin: 0;"> <span id="LC1031" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How do we do that? Consider</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1016,13 +1034,13 @@ How do we do that? Consider</td>
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1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f True True = ()</span></span>
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1017
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1035
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<pre style="margin: 0;"> <span id="LC1035" class="line" lang="haskell"></span>
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1018
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1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And imagine we set our limit to 1 for the sake of the example. The first clause</span></span>
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1019
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<pre style="margin: 0;">-<span id="LC1019" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will be checked against the initial <span class="idiff left right">Delt</span>a, {}. Doing so will produce an</span></span>
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1037
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<pre style="margin: 0;">+<span id="LC1037" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will be checked against the initial <span class="idiff left right">Nabl</span>a, {}. Doing so will produce an</span></span>
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1020
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1038
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Uncovered set of size 2, containing the models {x/~True} and {x~True,y/~True}.</span></span>
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1021
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1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Also we find the first clause to cover the model {x~True,y~True}.</span></span>
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1022
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1040
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<pre style="margin: 0;"> <span id="LC1040" class="line" lang="haskell"></span>
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1023
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But the Uncovered set we get out of the match is too huge! We somehow have to</span></span>
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1024
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ensure not to make things worse as they are already, so we continue checking</span></span>
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1025
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<pre style="margin: 0;">-<span id="LC1025" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with a singleton Uncovered set of the initial <span class="idiff left right">Delt</span>a {}. Why is this</span></span>
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1043
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<pre style="margin: 0;">+<span id="LC1043" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with a singleton Uncovered set of the initial <span class="idiff left right">Nabl</span>a {}. Why is this</span></span>
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1026
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1044
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<pre style="margin: 0;"> <span id="LC1044" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">sound (wrt. the notion in GADTs Meet Their Match)? Well, it basically amounts</span></span>
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1027
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1045
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<pre style="margin: 0;"> <span id="LC1045" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to forgetting that we matched against the first clause. The values represented</span></span>
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1028
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1046
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<pre style="margin: 0;"> <span id="LC1046" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by {} are a superset of those represented by its two refinements {x/~True} and</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1093,41 +1111,41 @@ addRedundantBangs red_bangs cirb =</td>
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1093
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1111
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<pre style="margin: 0;"> <span id="LC1111" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 1. A 'CIRB', classifying every encountered RHS in the tree as</span></span>
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1094
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1112
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<pre style="margin: 0;"> <span id="LC1112" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- redundant, inaccessible or covered.</span></span>
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1095
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1113
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<pre style="margin: 0;"> <span id="LC1113" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 2. A piece of long-distance information @ldi@, consisting of a</span></span>
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1096
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<pre style="margin: 0;">-<span id="LC1096" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- nesting of '<span class="idiff left right">Delt</span>as' mirroring tree structure.</span></span>
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1114
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<pre style="margin: 0;">+<span id="LC1114" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- nesting of '<span class="idiff left right">Nabl</span>as' mirroring tree structure.</span></span>
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1097
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1115
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<pre style="margin: 0;"> <span id="LC1115" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For example, 'collectMatchGroup' operates on a Match Group and thus</span></span>
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1098
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<pre style="margin: 0;">-<span id="LC1098" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returns a list of '<span class="idiff left right">Delt</span>as' for the pattern part of each Match, as well as</span></span>
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1099
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<pre style="margin: 0;">-<span id="LC1099" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a further nested list of '<span class="idiff left right">Delt</span>as' for each of the GRHS of the Match.</span></span>
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1116
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<pre style="margin: 0;">+<span id="LC1116" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returns a list of '<span class="idiff left right">Nabl</span>as' for the pattern part of each Match, as well as</span></span>
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1117
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<pre style="margin: 0;">+<span id="LC1117" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a further nested list of '<span class="idiff left right">Nabl</span>as' for each of the GRHS of the Match.</span></span>
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1100
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1118
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<pre style="margin: 0;"> <span id="LC1118" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">CIRBCollector</span> <span class="n" style="color: #333;">ann</span> <span class="n" style="color: #333;">ldi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ann</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CIRB</span><span class="p">,</span> <span class="n" style="color: #333;">ldi</span><span class="p">)</span></span>
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1101
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1119
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<pre style="margin: 0;"> <span id="LC1119" class="line" lang="haskell"></span>
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1102
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<pre style="margin: 0;">-<span id="LC1102" class="line" lang="haskell"><span class="cd">-- | Checks the '<span class="idiff left right">Delt</span>as' in a 'RedSets' for inhabitants and returns</span></span>
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1120
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<pre style="margin: 0;">+<span id="LC1120" class="line" lang="haskell"><span class="cd">-- | Checks the '<span class="idiff left right">Nabl</span>as' in a 'RedSets' for inhabitants and returns</span></span>
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1103
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1121
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<pre style="margin: 0;"> <span id="LC1121" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 1. Whether the Covered set was inhabited</span></span>
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1104
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1122
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<pre style="margin: 0;"> <span id="LC1122" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 2. Whether the Diverging set was inhabited</span></span>
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1105
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1123
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<pre style="margin: 0;"> <span id="LC1123" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 3. The new inhabited Covered set for long-distance information.</span></span>
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1106
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1124
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<pre style="margin: 0;"> <span id="LC1124" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Recovering from unsatisfiable pattern-matching constraints].</span></span>
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1107
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<pre style="margin: 0;">-<span id="LC1107" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 4. All source bangs whose '<span class="idiff left right">Delt</span>as' were empty, which means they are</span></span>
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1125
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<pre style="margin: 0;">+<span id="LC1125" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 4. All source bangs whose '<span class="idiff left right">Nabl</span>as' were empty, which means they are</span></span>
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1108
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1126
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<pre style="margin: 0;"> <span id="LC1126" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- redundant.</span></span>
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1109
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<pre style="margin: 0;">-<span id="LC1109" class="line" lang="haskell"><span class="n" style="color: #333;">testRedSets</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">RedSets</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Bool</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Bool</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1127" class="line" lang="haskell"><span class="n" style="color: #333;">testRedSets</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">RedSets</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Bool</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Bool</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">)</span></span>
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1110
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1128
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<pre style="margin: 0;"> <span id="LC1128" class="line" lang="haskell"><span class="n" style="color: #333;">testRedSets</span> <span class="n" style="color: #333;">ldi</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cov</span><span class="p">,</span> <span class="n" style="color: #333;">rs_div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">div</span><span class="p">,</span> <span class="n" style="color: #333;">rs_bangs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bangs</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1111
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1129
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<pre style="margin: 0;"> <span id="LC1129" class="line" lang="haskell"> <span class="n" style="color: #333;">is_covered</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isInhabited</span> <span class="n" style="color: #333;">cov</span></span>
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1112
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1130
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<pre style="margin: 0;"> <span id="LC1130" class="line" lang="haskell"> <span class="n" style="color: #333;">may_diverge</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isInhabited</span> <span class="n" style="color: #333;">div</span></span>
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1113
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<pre style="margin: 0;">-<span id="LC1113" class="line" lang="haskell"> <span class="n" style="color: #333;">red_bangs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">mapMaybeM</span> <span class="p">(</span><span class="n" style="color: #333;">fromOL</span> <span class="n" style="color: #333;">bangs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">delt</span>as</span><span class="p">,</span> <span class="n" style="color: #333;">bang</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1114
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<pre style="margin: 0;">-<span id="LC1114" class="line" lang="haskell"> <span class="n" style="color: #333;">isInhabited</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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1131
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<pre style="margin: 0;">+<span id="LC1131" class="line" lang="haskell"> <span class="n" style="color: #333;">red_bangs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">mapMaybeM</span> <span class="p">(</span><span class="n" style="color: #333;">fromOL</span> <span class="n" style="color: #333;">bangs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as</span><span class="p">,</span> <span class="n" style="color: #333;">bang</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1132
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<pre style="margin: 0;">+<span id="LC1132" class="line" lang="haskell"> <span class="n" style="color: #333;">isInhabited</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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1115
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1133
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<pre style="margin: 0;"> <span id="LC1133" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1116
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<td class="diff-line-num new_line" data-linenumber="1134" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1134
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<pre style="margin: 0;"> <span id="LC1134" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">bang</span><span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="1117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1117
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<td class="diff-line-num new_line" data-linenumber="1135" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1135
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<pre style="margin: 0;"> <span id="LC1135" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Recovering from unsatisfiable pattern-matching constraints]</span></span>
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1118
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<td class="diff-line-num new_line old" data-linenumber="1136" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1118" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Delt</span>as for long-distance info: Use (non-empty!) fallback ldi if Covered</span></span>
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1136
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<pre style="margin: 0;">+<span id="LC1136" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Nabl</span>as for long-distance info: Use (non-empty!) fallback ldi if Covered</span></span>
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1119
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<td class="diff-line-num new_line" data-linenumber="1137" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1137
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<pre style="margin: 0;"> <span id="LC1137" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- set was empty</span></span>
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1120
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<td class="diff-line-num new_line" data-linenumber="1138" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1138
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<pre style="margin: 0;"> <span id="LC1138" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ldi'</span></span>
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1121
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1139
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<pre style="margin: 0;"> <span id="LC1139" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_covered</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cov</span></span>
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1122
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1140
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<pre style="margin: 0;"> <span id="LC1140" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ldi</span></span>
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1123
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1141
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<pre style="margin: 0;"> <span id="LC1141" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">is_covered</span><span class="p">,</span> <span class="n" style="color: #333;">may_diverge</span><span class="p">,</span> <span class="n" style="color: #333;">ldi'</span><span class="p">,</span> <span class="n" style="color: #333;">toOL</span> <span class="n" style="color: #333;">red_bangs</span><span class="p">)</span></span>
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1124
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1142
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<pre style="margin: 0;"> <span id="LC1142" class="line" lang="haskell"></span>
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1125
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<pre style="margin: 0;">-<span id="LC1125" class="line" lang="haskell"><span class="n" style="color: #333;">collectMatchGroup</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CIRBCollector</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AnnMatchGroup</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span><span class="p">))</span></span>
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1143
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<pre style="margin: 0;">+<span id="LC1143" class="line" lang="haskell"><span class="n" style="color: #333;">collectMatchGroup</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CIRBCollector</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AnnMatchGroup</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span><span class="p">))</span></span>
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1126
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1144
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<pre style="margin: 0;"> <span id="LC1144" class="line" lang="haskell"><span class="n" style="color: #333;">collectMatchGroup</span> <span class="n" style="color: #333;">ldi</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AnnMatchGroup</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1127
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1145
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<pre style="margin: 0;"> <span id="LC1145" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">cirbs</span><span class="p">,</span> <span class="n" style="color: #333;">ldis</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">NE</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">unzip</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverse</span> <span class="p">(</span><span class="n" style="color: #333;">collectMatch</span> <span class="n" style="color: #333;">ldi</span><span class="p">)</span> <span class="n" style="color: #333;">matches</span></span>
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1128
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1146
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<pre style="margin: 0;"> <span id="LC1146" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">sconcat</span> <span class="n" style="color: #333;">cirbs</span><span class="p">,</span> <span class="n" style="color: #333;">ldis</span><span class="p">)</span></span>
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1129
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1147
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<pre style="margin: 0;"> <span id="LC1147" class="line" lang="haskell"></span>
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1130
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<pre style="margin: 0;">-<span id="LC1130" class="line" lang="haskell"><span class="n" style="color: #333;">collectMatch</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CIRBCollector</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AnnMatch</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span><span class="p">)</span></span>
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1148
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<pre style="margin: 0;">+<span id="LC1148" class="line" lang="haskell"><span class="n" style="color: #333;">collectMatch</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CIRBCollector</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AnnMatch</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span><span class="p">)</span></span>
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1131
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1149
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<pre style="margin: 0;"> <span id="LC1149" class="line" lang="haskell"><span class="n" style="color: #333;">collectMatch</span> <span class="n" style="color: #333;">ldi</span> <span class="kt" style="color: #458; font-weight: 600;">AnnMatch</span> <span class="p">{</span> <span class="n" style="color: #333;">am_red</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">red</span><span class="p">,</span> <span class="n" style="color: #333;">am_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1132
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1150
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<pre style="margin: 0;"> <span id="LC1150" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">is_covered</span><span class="p">,</span> <span class="n" style="color: #333;">may_diverge</span><span class="p">,</span> <span class="n" style="color: #333;">ldi'</span><span class="p">,</span> <span class="n" style="color: #333;">red_bangs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">testRedSets</span> <span class="n" style="color: #333;">ldi</span> <span class="n" style="color: #333;">red</span></span>
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<td class="diff-line-num old_line" data-linenumber="1133" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1133
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1151
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<pre style="margin: 0;"> <span id="LC1151" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">cirb</span><span class="p">,</span> <span class="n" style="color: #333;">ldis</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">collectGRHSs</span> <span class="n" style="color: #333;">ldi'</span> <span class="n" style="color: #333;">grhss</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1138" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1156" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1138,12 +1156,12 @@ collectMatch ldi AnnMatch { am_red = red, am_grhss = grhss } = do</td>
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1138
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1156
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<pre style="margin: 0;"> <span id="LC1156" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cirb</span></span>
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1139
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1157
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<pre style="margin: 0;"> <span id="LC1157" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">cirb'</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">ldi'</span><span class="p">,</span> <span class="n" style="color: #333;">ldis</span><span class="p">))</span></span>
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1140
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1158
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<pre style="margin: 0;"> <span id="LC1158" class="line" lang="haskell"></span>
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1141
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<pre style="margin: 0;">-<span id="LC1141" class="line" lang="haskell"><span class="n" style="color: #333;">collectGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CIRBCollector</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AnnGRHS</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span><span class="p">)</span></span>
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1159
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<pre style="margin: 0;">+<span id="LC1159" class="line" lang="haskell"><span class="n" style="color: #333;">collectGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CIRBCollector</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AnnGRHS</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span><span class="p">)</span></span>
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1142
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1160
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<pre style="margin: 0;"> <span id="LC1160" class="line" lang="haskell"><span class="n" style="color: #333;">collectGRHSs</span> <span class="n" style="color: #333;">ldi</span> <span class="n" style="color: #333;">grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1143
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1161
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<pre style="margin: 0;"> <span id="LC1161" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">cirbs</span><span class="p">,</span> <span class="n" style="color: #333;">ldis</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">NE</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">unzip</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverse</span> <span class="p">(</span><span class="n" style="color: #333;">collectGRHS</span> <span class="n" style="color: #333;">ldi</span><span class="p">)</span> <span class="n" style="color: #333;">grhss</span></span>
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1144
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1162
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<pre style="margin: 0;"> <span id="LC1162" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">sconcat</span> <span class="n" style="color: #333;">cirbs</span><span class="p">,</span> <span class="n" style="color: #333;">ldis</span><span class="p">)</span></span>
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1145
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1163
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<pre style="margin: 0;"> <span id="LC1163" class="line" lang="haskell"></span>
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1146
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<pre style="margin: 0;">-<span id="LC1146" class="line" lang="haskell"><span class="n" style="color: #333;">collectGRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CIRBCollector</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AnnGRHS</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span></span>
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1164
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<pre style="margin: 0;">+<span id="LC1164" class="line" lang="haskell"><span class="n" style="color: #333;">collectGRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CIRBCollector</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AnnGRHS</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span></span>
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1147
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1165
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<pre style="margin: 0;"> <span id="LC1165" class="line" lang="haskell"><span class="n" style="color: #333;">collectGRHS</span> <span class="n" style="color: #333;">ldi</span> <span class="kt" style="color: #458; font-weight: 600;">AnnGRHS</span> <span class="p">{</span> <span class="n" style="color: #333;">ag_red</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">red</span><span class="p">,</span> <span class="n" style="color: #333;">ag_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1148
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1166
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<pre style="margin: 0;"> <span id="LC1166" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">is_covered</span><span class="p">,</span> <span class="n" style="color: #333;">may_diverge</span><span class="p">,</span> <span class="n" style="color: #333;">ldi'</span><span class="p">,</span> <span class="n" style="color: #333;">red_bangs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">testRedSets</span> <span class="n" style="color: #333;">ldi</span> <span class="n" style="color: #333;">red</span></span>
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1149
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1167
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<pre style="margin: 0;"> <span id="LC1167" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">cirb</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_covered</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span> <span class="p">{</span> <span class="n" style="color: #333;">cirb_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitOL</span> <span class="n" style="color: #333;">info</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1174" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1156,9 +1174,9 @@ collectEmptyCase _ = pure (mempty, ())</td>
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1156
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1174
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<pre style="margin: 0;"> <span id="LC1174" class="line" lang="haskell"></span>
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1157
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1175
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<pre style="margin: 0;"> <span id="LC1175" class="line" lang="haskell"><span class="n" style="color: #333;">collectPatBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CIRBCollector</span> <span class="kt" style="color: #458; font-weight: 600;">AnnPatBind</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1158
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1176
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<pre style="margin: 0;"> <span id="LC1176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We don't make use of long-distance information in pattern bindings, hence</span></span>
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1159
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<pre style="margin: 0;">-<span id="LC1159" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @()@ instead of some '<span class="idiff left right">Delt</span>as'.</span></span>
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1177
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<pre style="margin: 0;">+<span id="LC1177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @()@ instead of some '<span class="idiff left right">Nabl</span>as'.</span></span>
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1160
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1178
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<pre style="margin: 0;"> <span id="LC1178" class="line" lang="haskell"><span class="n" style="color: #333;">collectPatBind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AnnPatBind</span> <span class="n" style="color: #333;">grhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1161
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<pre style="margin: 0;">-<span id="LC1161" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- use 'mempty' as fallback '<span class="idiff left right">Delt</span>as' because we discard it anyway</span></span>
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1179
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<pre style="margin: 0;">+<span id="LC1179" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- use 'mempty' as fallback '<span class="idiff left right">Nabl</span>as' because we discard it anyway</span></span>
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1162
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1180
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<pre style="margin: 0;"> <span id="LC1180" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">cirb</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">collectGRHS</span> <span class="n" style="color: #333;">mempty</span> <span class="n" style="color: #333;">grhs</span></span>
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1163
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1181
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<pre style="margin: 0;"> <span id="LC1181" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">cirb</span><span class="p">,</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span></span>
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1164
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1182
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<pre style="margin: 0;"> <span id="LC1182" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1254" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1236,10 +1254,10 @@ reportWarnings dflags ctx@(DsMatchContext kind loc) vars</td>
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1236
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1254
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<pre style="margin: 0;"> <span id="LC1254" class="line" lang="haskell"> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">q</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">matchSeparator</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"..."</span><span class="p">)</span></span>
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1237
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1255
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<pre style="margin: 0;"> <span id="LC1255" class="line" lang="haskell"></span>
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1238
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1256
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<pre style="margin: 0;"> <span id="LC1256" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Print several clauses (for uncovered clauses)</span></span>
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1239
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<pre style="margin: 0;">-<span id="LC1239" class="line" lang="haskell"> <span class="n" style="color: #333;">pprEqns</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprContext</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"are non-exhaustive"</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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1257
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<pre style="margin: 0;">+<span id="LC1257" class="line" lang="haskell"> <span class="n" style="color: #333;">pprEqns</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprContext</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"are non-exhaustive"</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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1240
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1258
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<pre style="margin: 0;"> <span id="LC1258" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">vars</span> <span class="kr" style="font-weight: 600;">of</span> <span class="c1" style="color: #998; font-style: italic;">-- See #11245</span></span>
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1241
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1259
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<pre style="margin: 0;"> <span id="LC1259" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Guards do not cover entire pattern space"</span></span>
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1242
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<pre style="margin: 0;">-<span id="LC1242" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">us</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pprUncovered</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">delta</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vars</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>as</span></span>
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1260
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<pre style="margin: 0;">+<span id="LC1260" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">us</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pprUncovered</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nabla</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vars</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>as</span></span>
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1243
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1261
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<pre style="margin: 0;"> <span id="LC1261" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Patterns not matched:"</span><span class="p">)</span> <span class="mi" style="color: #099;">4</span></span>
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1244
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1262
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<pre style="margin: 0;"> <span id="LC1262" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">(</span><span class="n" style="color: #333;">take</span> <span class="n" style="color: #333;">maxPatterns</span> <span class="n" style="color: #333;">us</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">dots</span> <span class="n" style="color: #333;">maxPatterns</span> <span class="n" style="color: #333;">us</span><span class="p">)</span></span>
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1245
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1263
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<pre style="margin: 0;"> <span id="LC1263" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1254" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1272" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1254,14 +1272,14 @@ reportWarnings dflags ctx@(DsMatchContext kind loc) vars</td>
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1254
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1272
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<pre style="margin: 0;"> <span id="LC1272" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">bullet</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Patterns reported as unmatched might actually be matched"</span><span class="p">)</span></span>
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1255
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1273
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<pre style="margin: 0;"> <span id="LC1273" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Increase the limit or resolve the warnings to suppress this message."</span> <span class="p">]</span></span>
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1256
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1274
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<pre style="margin: 0;"> <span id="LC1274" class="line" lang="haskell"></span>
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1257
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<pre style="margin: 0;">-<span id="LC1257" class="line" lang="haskell"><span class="n" style="color: #333;">getNFirstUncovered</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span><span class="p">]</span></span>
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1258
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<pre style="margin: 0;">-<span id="LC1258" class="line" lang="haskell"><span class="n" style="color: #333;">getNFirstUncovered</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">deltas</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">bagToList</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>as</span><span class="p">)</span></span>
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1275
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<pre style="margin: 0;">+<span id="LC1275" class="line" lang="haskell"><span class="n" style="color: #333;">getNFirstUncovered</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span><span class="p">]</span></span>
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1276
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<pre style="margin: 0;">+<span id="LC1276" class="line" lang="haskell"><span class="n" style="color: #333;">getNFirstUncovered</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">bagToList</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>as</span><span class="p">)</span></span>
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1259
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1277
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<pre style="margin: 0;"> <span id="LC1277" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1260
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1278
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<pre style="margin: 0;"> <span id="LC1278" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;">0</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1261
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1279
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<pre style="margin: 0;"> <span id="LC1279" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1262
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<pre style="margin: 0;">-<span id="LC1262" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="n" style="color: #333;"><span class="idiff right">delt</span>as</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1263
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<pre style="margin: 0;">-<span id="LC1263" class="line" lang="haskell"> <span class="n" style="color: #333;">front</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">provideEvidence</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span></span>
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1264
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<pre style="margin: 0;">-<span id="LC1264" class="line" lang="haskell"> <span class="n" style="color: #333;">back</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">front</span><span class="p">)</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as</span></span>
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1280
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<pre style="margin: 0;">+<span id="LC1280" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>as</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1281
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<pre style="margin: 0;">+<span id="LC1281" class="line" lang="haskell"> <span class="n" style="color: #333;">front</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">provideEvidence</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1282" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1282
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<pre style="margin: 0;">+<span id="LC1282" class="line" lang="haskell"> <span class="n" style="color: #333;">back</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">front</span><span class="p">)</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as</span></span>
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1265
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1283
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<pre style="margin: 0;"> <span id="LC1283" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">front</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">back</span><span class="p">)</span></span>
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1266
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1284
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<pre style="margin: 0;"> <span id="LC1284" class="line" lang="haskell"></span>
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1267
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1285
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<pre style="margin: 0;"> <span id="LC1285" class="line" lang="haskell"><span class="n" style="color: #333;">dots</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1386" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1404" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1386,21 +1404,21 @@ code that we don't want to warn about.</td>
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1386
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1404
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<pre style="margin: 0;"> <span id="LC1404" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Long-distance information</span></span>
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1387
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1405
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<pre style="margin: 0;"> <span id="LC1405" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1388
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1406
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<pre style="margin: 0;"> <span id="LC1406" class="line" lang="haskell"></span>
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1389
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<pre style="margin: 0;">-<span id="LC1389" class="line" lang="haskell"><span class="cd">-- | Locally update 'dsl_<span class="idiff left right">delt</span>as' with the given action, but defer evaluation</span></span>
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1407
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<pre style="margin: 0;">+<span id="LC1407" class="line" lang="haskell"><span class="cd">-- | Locally update 'dsl_<span class="idiff left right">nabl</span>as' with the given action, but defer evaluation</span></span>
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1390
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1408
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<pre style="margin: 0;"> <span id="LC1408" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with 'unsafeInterleaveM' in order not to do unnecessary work.</span></span>
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1391
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<pre style="margin: 0;">-<span id="LC1391" class="line" lang="haskell"><span class="n" style="color: #333;">locallyExtendPm<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="n" style="color: #333;">a</span></span>
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1392
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<pre style="margin: 0;">-<span id="LC1392" class="line" lang="haskell"><span class="n" style="color: #333;">locallyExtendPm<span class="idiff left right">Delt</span>as</span> <span class="n" style="color: #333;">ext</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1393
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<pre style="margin: 0;">-<span id="LC1393" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">getPmDelt</span>as</span></span>
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1394
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<pre style="margin: 0;">-<span id="LC1394" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unsafeInterleaveM</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1395
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<pre style="margin: 0;">-<span id="LC1395" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">deltas'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ext</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>as</span></span>
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1396
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<pre style="margin: 0;">-<span id="LC1396" class="line" lang="haskell"> <span class="n" style="color: #333;">inh</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isInhabited</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as'</span></span>
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1409
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<pre style="margin: 0;">+<span id="LC1409" class="line" lang="haskell"><span class="n" style="color: #333;">locallyExtendPm<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="n" style="color: #333;">a</span></span>
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1410
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<pre style="margin: 0;">+<span id="LC1410" class="line" lang="haskell"><span class="n" style="color: #333;">locallyExtendPm<span class="idiff left right">Nabl</span>as</span> <span class="n" style="color: #333;">ext</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1411
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<pre style="margin: 0;">+<span id="LC1411" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">getPmNabl</span>as</span></span>
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1412
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<pre style="margin: 0;">+<span id="LC1412" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unsafeInterleaveM</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1413
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<pre style="margin: 0;">+<span id="LC1413" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">nablas'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ext</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>as</span></span>
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1414
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<pre style="margin: 0;">+<span id="LC1414" class="line" lang="haskell"> <span class="n" style="color: #333;">inh</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isInhabited</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as'</span></span>
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1397
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1415
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<pre style="margin: 0;"> <span id="LC1415" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If adding a constraint would lead to a contradiction, don't add it.</span></span>
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1398
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1416
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<pre style="margin: 0;"> <span id="LC1416" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Recovering from unsatisfiable pattern-matching constraints]</span></span>
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1399
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1417
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<pre style="margin: 0;"> <span id="LC1417" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for why this is done.</span></span>
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1400
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1418
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<pre style="margin: 0;"> <span id="LC1418" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">inh</span></span>
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1401
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<pre style="margin: 0;">-<span id="LC1401" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as'</span></span>
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1402
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<pre style="margin: 0;">-<span id="LC1402" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>as</span></span>
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1403
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<pre style="margin: 0;">-<span id="LC1403" class="line" lang="haskell"> <span class="n" style="color: #333;">updPm<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>as'</span> <span class="n" style="color: #333;">k</span></span>
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1419
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<pre style="margin: 0;">+<span id="LC1419" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as'</span></span>
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1420
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<pre style="margin: 0;">+<span id="LC1420" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>as</span></span>
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1421
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<pre style="margin: 0;">+<span id="LC1421" class="line" lang="haskell"> <span class="n" style="color: #333;">updPm<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>as'</span> <span class="n" style="color: #333;">k</span></span>
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1404
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1422
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<pre style="margin: 0;"> <span id="LC1422" class="line" lang="haskell"></span>
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1405
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1423
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<pre style="margin: 0;"> <span id="LC1423" class="line" lang="haskell"><span class="cd">-- | Add in-scope type constraints if the coverage checker might run and then</span></span>
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1406
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1424
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<pre style="margin: 0;"> <span id="LC1424" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- run the given action.</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1426" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1408,7 +1426,7 @@ addTyCs :: Origin -> Bag EvVar -> DsM a -> DsM a</td>
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1408
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1426
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<pre style="margin: 0;"> <span id="LC1426" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCs</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">ev_vars</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1409
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1427
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<pre style="margin: 0;"> <span id="LC1427" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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1410
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1428
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<pre style="margin: 0;"> <span id="LC1428" class="line" lang="haskell"> <span class="n" style="color: #333;">applyWhen</span> <span class="p">(</span><span class="n" style="color: #333;">needToRunPmCheck</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">origin</span><span class="p">)</span></span>
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1411
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<pre style="margin: 0;">-<span id="LC1411" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">locallyExtendPm<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff">deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addPmCtsDeltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>as</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmTyCt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">evVarPred</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">ev_vars</span><span class="p">)))</span></span>
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1429
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<pre style="margin: 0;">+<span id="LC1429" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">locallyExtendPm<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addPmCtsNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>as</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmTyCt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">evVarPred</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">ev_vars</span><span class="p">)))</span></span>
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1412
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1430
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<pre style="margin: 0;"> <span id="LC1430" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span></span>
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1413
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1431
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<pre style="margin: 0;"> <span id="LC1431" class="line" lang="haskell"></span>
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1414
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1432
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<pre style="margin: 0;"> <span id="LC1432" class="line" lang="haskell"><span class="cd">-- | Add equalities for the 'CoreExpr' scrutinee to the local 'DsM' environment</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1419" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1437" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1419,8 +1437,8 @@ addTyCs origin ev_vars m = do</td>
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1419
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1437
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<pre style="margin: 0;"> <span id="LC1437" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreScrutTmCs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="n" style="color: #333;">a</span></span>
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1420
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1438
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<pre style="margin: 0;"> <span id="LC1438" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreScrutTmCs</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">k</span></span>
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1421
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1439
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<pre style="margin: 0;"> <span id="LC1439" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreScrutTmCs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">scr</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span></span>
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1422
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<pre style="margin: 0;">-<span id="LC1422" class="line" lang="haskell"> <span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">locallyExtendPm<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff right">delt</span>as</span> <span class="o" style="font-weight: 600;">-></span></span>
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1423
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<pre style="margin: 0;">-<span id="LC1423" class="line" lang="haskell"> <span class="n" style="color: #333;">addPmCts<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>as</span> <span class="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmCoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">scr</span><span class="p">))</span></span>
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1440
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<pre style="margin: 0;">+<span id="LC1440" class="line" lang="haskell"> <span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">locallyExtendPm<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>as</span> <span class="o" style="font-weight: 600;">-></span></span>
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1441
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<pre style="margin: 0;">+<span id="LC1441" class="line" lang="haskell"> <span class="n" style="color: #333;">addPmCts<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>as</span> <span class="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmCoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">scr</span><span class="p">))</span></span>
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1424
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1442
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<pre style="margin: 0;"> <span id="LC1442" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreScrutTmCs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"addCoreScrutTmCs: scrutinee, but more than one match id"</span></span>
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1425
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1443
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<pre style="margin: 0;"> <span id="LC1443" class="line" lang="haskell"></span>
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1426
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1444
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<pre style="margin: 0;"> <span id="LC1444" class="line" lang="haskell"><span class="cd">-- | 'addCoreScrutTmCs', but desugars the 'LHsExpr' first.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1448,10 +1466,10 @@ of @f@.</td>
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1448
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1466
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<pre style="margin: 0;"> <span id="LC1466" class="line" lang="haskell"></span>
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1449
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1467
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<pre style="margin: 0;"> <span id="LC1467" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To achieve similar reasoning in the coverage checker, we keep track of the set</span></span>
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1450
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1468
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<pre style="margin: 0;"> <span id="LC1468" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of values that can reach a particular program point (often loosely referred to</span></span>
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1451
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<pre style="margin: 0;">-<span id="LC1451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">as "Covered set") in 'GHC.HsToCore.Monad.dsl_<span class="idiff left right">delt</span>as'.</span></span>
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1452
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<pre style="margin: 0;">-<span id="LC1452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We fill that set with Covered <span class="idiff left right">Delt</span>as returned by the exported checking</span></span>
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1469
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<pre style="margin: 0;">+<span id="LC1469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">as "Covered set") in 'GHC.HsToCore.Monad.dsl_<span class="idiff left right">nabl</span>as'.</span></span>
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1470
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<pre style="margin: 0;">+<span id="LC1470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We fill that set with Covered <span class="idiff left right">Nabl</span>as returned by the exported checking</span></span>
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1453
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1471
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<pre style="margin: 0;"> <span id="LC1471" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">functions, which the call sites put into place with</span></span>
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1454
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<pre style="margin: 0;">-<span id="LC1454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'GHC.HsToCore.Monad.updPm<span class="idiff left right">Delt</span>as'.</span></span>
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1472
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<pre style="margin: 0;">+<span id="LC1472" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'GHC.HsToCore.Monad.updPm<span class="idiff left right">Nabl</span>as'.</span></span>
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1455
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1473
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<pre style="margin: 0;"> <span id="LC1473" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Call sites also extend this set with facts from type-constraint dictionaries,</span></span>
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1456
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1474
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<pre style="margin: 0;"> <span id="LC1474" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">case scrutinees, etc. with the exported functions 'addTyCs', 'addCoreScrutTmCs'</span></span>
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1457
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1475
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<pre style="margin: 0;"> <span id="LC1475" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and 'addHsScrutTmCs'.</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1490" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1472,9 +1490,9 @@ unreachable.</td>
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1472
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1490
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<pre style="margin: 0;"> <span id="LC1490" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We can do better than this, by making sure that the Covered set used for</span></span>
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1473
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1491
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<pre style="margin: 0;"> <span id="LC1491" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Long-distance information] is always inhabited.</span></span>
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1474
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1492
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<pre style="margin: 0;"> <span id="LC1492" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For Covered sets returned by the exported checking functions, that is ensured</span></span>
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1475
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<pre style="margin: 0;">-<span id="LC1475" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in 'testRedSets', which takes and returns a non-empty fallback '<span class="idiff left right">Delt</span>as' in case</span></span>
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1493
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<pre style="margin: 0;">+<span id="LC1493" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in 'testRedSets', which takes and returns a non-empty fallback '<span class="idiff left right">Nabl</span>as' in case</span></span>
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1476
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1494
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<pre style="margin: 0;"> <span id="LC1494" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the refined Covered set became uninhabited.</span></span>
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<pre style="margin: 0;"> <span id="LC1495" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Also, whenever "external" knowledge from a type constraint or case scrutinee is</span></span>
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<pre style="margin: 0;">-<span id="LC1478" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">integrated, we only commit that knowledge to 'GHC.HsToCore.Monad.dsl_<span class="idiff left right">delt</span>as' if</span></span>
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<pre style="margin: 0;">-<span id="LC1479" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the set remains inhabited. That check happens in 'locallyExtendPm<span class="idiff left right">Delt</span>as'.</span></span>
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<pre style="margin: 0;">+<span id="LC1496" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">integrated, we only commit that knowledge to 'GHC.HsToCore.Monad.dsl_<span class="idiff left right">nabl</span>as' if</span></span>
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<pre style="margin: 0;">+<span id="LC1497" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the set remains inhabited. That check happens in 'locallyExtendPm<span class="idiff left right">Nabl</span>as'.</span></span>
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<pre style="margin: 0;"> <span id="LC1498" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -4,22 +4,25 @@ Authors: George Karachalias <george.karachalias@cs.kuleuven.be></td>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Ryan Scott <ryan.gl.scott@gmail.com></span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP, LambdaCase, TupleSections, PatternSynonyms, ViewPatterns, MultiWayIf #-}</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP, LambdaCase, TupleSections, PatternSynonyms, ViewPatterns, MultiWayIf<span class="idiff left right">, ScopedTypeVariables</span> #-}</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"><span class="cd">-- | The pattern match oracle. The main export of the module are the functions</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'addPmCts' for adding facts to the oracle, and 'provideEvidence' to turn a</span></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'Delta' into a concrete evidence for an equation.</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'Nabla' into a concrete evidence for an equation.</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In terms of the [Lower Your Guards paper](https://dl.acm.org/doi/abs/10.1145/3408989)</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- describing the implementation, this module is concerned with Sections 3.4, 3.6 and 3.7.</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- E.g., it represents refinement types diretly as a normalised refinement type 'Nabla'.</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck.Oracle</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tracePm</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkPmId</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Delta</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">initDelt</span>as</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lookupRefuts</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lookupSolution</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nabla</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">initNabl</span>as</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lookupRefuts</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lookupSolution</span><span class="p">,</span></span>
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20
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmCt</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmTyCt</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">PmCts</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">PmCoreCt</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">PmConCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">PmNotConCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">PmBotCt</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">PmNotBotCt</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addPmCts</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- Add a constraint to the oracle.</span></span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">canDiverge</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- Try to add the term equality x ~ ⊥</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">provideEvidence</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -153,12 +156,7 @@ mkOneConFull arg_tys con = do</td>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to the type oracle</span></span>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ty_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTheta</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">eqSpecPreds</span> <span class="n" style="color: #333;">eq_spec</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">thetas</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Figure out the types of strict constructor fields</span></span>
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<pre style="margin: 0;">-<span id="LC156" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">arg_is_strict</span></span>
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<pre style="margin: 0;">-<span id="LC157" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">con</span></span>
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158
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isNewTyCon</span> <span class="p">(</span><span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span></span>
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159
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Divergence of Newtype matches]</span></span>
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<pre style="margin: 0;">-<span id="LC160" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">-<span id="LC161" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">isBanged</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">conLikeImplBangs</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">arg_is_strict</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">isBanged</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">conLikeImplBangs</span> <span class="n" style="color: #333;">con</span></span>
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162
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"> <span class="n" style="color: #333;">strict_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterByList</span> <span class="n" style="color: #333;">arg_is_strict</span> <span class="n" style="color: #333;">field_tys'</span></span>
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163
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ex_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">vars</span><span class="p">,</span> <span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">ty_cs</span><span class="p">,</span> <span class="n" style="color: #333;">strict_arg_tys</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -169,8 +167,8 @@ mkOneConFull arg_tys con = do</td>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Composable satisfiability checks</span></span>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"><span class="cd">-- | Given a '<span class="idiff left right">Delt</span>a', check if it is compatible with new facts encoded in this</span></span>
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- this check. If so, return 'Just' a potentially extended '<span class="idiff left right">Delt</span>a'. Return</span></span>
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"><span class="cd">-- | Given a '<span class="idiff left right">Nabl</span>a', check if it is compatible with new facts encoded in this</span></span>
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- this check. If so, return 'Just' a potentially extended '<span class="idiff left right">Nabl</span>a'. Return</span></span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'Nothing' if unsatisfiable.</span></span>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- There are three essential SatisfiabilityChecks:</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -179,22 +177,22 @@ mkOneConFull arg_tys con = do</td>
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179
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 3. 'tysAreNonVoid', checks if the given types have an inhabitant</span></span>
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Functions like 'pmIsSatisfiable', 'nonVoid' and 'testInhabited' plug these</span></span>
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181
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- together as they see fit.</span></span>
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">SatisfiabilityCheck</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SC</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">SatisfiabilityCheck</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SC</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC184" class="line" lang="haskell"><span class="cd">-- | Check the given '<span class="idiff left right">Delt</span>a' for satisfiability by the given</span></span>
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<pre style="margin: 0;">-<span id="LC185" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'SatisfiabilityCheck'. Return 'Just' a new, potentially extended, '<span class="idiff left right">Delt</span>a' if</span></span>
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"><span class="cd">-- | Check the given '<span class="idiff left right">Nabl</span>a' for satisfiability by the given</span></span>
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'SatisfiabilityCheck'. Return 'Just' a new, potentially extended, '<span class="idiff left right">Nabl</span>a' if</span></span>
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- successful, and 'Nothing' otherwise.</span></span>
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"><span class="n" style="color: #333;">runSatisfiabilityCheck</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">SatisfiabilityCheck</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"><span class="n" style="color: #333;">runSatisfiabilityCheck</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">SC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">chk</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">chk</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span></span>
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="haskell"><span class="n" style="color: #333;">runSatisfiabilityCheck</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">SatisfiabilityCheck</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"><span class="n" style="color: #333;">runSatisfiabilityCheck</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">SC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">chk</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">chk</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span></span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"><span class="cd">-- | Allowing easy composition of 'SatisfiabilityCheck's.</span></span>
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Semigroup</span> <span class="kt" style="color: #458; font-weight: 600;">SatisfiabilityCheck</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is @a >=> b@ from MaybeT DsM</span></span>
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SC</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;"><></span> <span class="kt" style="color: #458; font-weight: 600;">SC</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SC</span> <span class="n" style="color: #333;">c</span></span>
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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<pre style="margin: 0;">+<span id="LC193" class="line" lang="haskell"> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;"><span class="idiff left">delta'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">b</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a'</span></span>
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<pre style="margin: 0;">+<span id="LC195" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;"><span class="idiff left">nabla'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">b</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a'</span></span>
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<pre style="margin: 0;"> <span id="LC196" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span> <span class="kt" style="color: #458; font-weight: 600;">SatisfiabilityCheck</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We only need this because of mconcat (which we use in place of sconcat,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -213,13 +211,13 @@ instance Monoid SatisfiabilityCheck where</td>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- discussed in GADTs Meet Their Match. For an explanation of what role they</span></span>
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- serve, see @Note [Strict argument type constraints]@.</span></span>
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="haskell"><span class="n" style="color: #333;">pmIsSatisfiable</span></span>
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<pre style="margin: 0;">-<span id="LC216" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The ambient term and type constraints</span></span>
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The ambient term and type constraints</span></span>
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (known to be satisfiable).</span></span>
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">TyCt</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The new type constraints.</span></span>
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">TmCt</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The new term constraints.</span></span>
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The strict argument types.</span></span>
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<pre style="margin: 0;">-<span id="LC221" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC222" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ @'Just' <span class="idiff left right">delta@ if the constraints (@delt</span>a@) are</span></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ @'Just' <span class="idiff left right">nabla@ if the constraints (@nabl</span>a@) are</span></span>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- satisfiable, and each strict argument type is inhabitable.</span></span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'Nothing' otherwise.</span></span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"><span class="n" style="color: #333;">pmIsSatisfiable</span> <span class="n" style="color: #333;">amb_cs</span> <span class="n" style="color: #333;">new_ty_cs</span> <span class="n" style="color: #333;">new_tm_cs</span> <span class="n" style="color: #333;">strict_arg_tys</span> <span class="o" style="font-weight: 600;">=</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -492,21 +490,21 @@ tyOracle (TySt inert) cts</td>
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"tyOracle"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">pprErrMsgBagWithLoc</span> <span class="n" style="color: #333;">errs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell"><span class="cd">-- | A 'SatisfiabilityCheck' based on new type-level constraints.</span></span>
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<pre style="margin: 0;">-<span id="LC495" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns a new '<span class="idiff left right">Delt</span>a' if the new constraints are compatible with existing</span></span>
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns a new '<span class="idiff left right">Nabl</span>a' if the new constraints are compatible with existing</span></span>
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<pre style="margin: 0;"> <span id="LC494" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ones. Doesn't bother calling out to the type oracle if the bag of new type</span></span>
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<pre style="margin: 0;"> <span id="LC495" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constraints was empty. Will only recheck 'PossibleMatches' in the term oracle</span></span>
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<pre style="margin: 0;"> <span id="LC496" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for emptiness if the first argument is 'True'.</span></span>
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"><span class="n" style="color: #333;">tyIsSatisfiable</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SatisfiabilityCheck</span></span>
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<pre style="margin: 0;">-<span id="LC500" class="line" lang="haskell"><span class="n" style="color: #333;">tyIsSatisfiable</span> <span class="n" style="color: #333;">recheck_complete_sets</span> <span class="n" style="color: #333;">new_ty_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SC</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC498" class="line" lang="haskell"><span class="n" style="color: #333;">tyIsSatisfiable</span> <span class="n" style="color: #333;">recheck_complete_sets</span> <span class="n" style="color: #333;">new_ty_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SC</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">new_ty_cs</span></span>
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<pre style="margin: 0;">-<span id="LC502" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC503" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">tyOracle</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">delta_ty_st</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span><span class="p">)</span> <span class="n" style="color: #333;">new_ty_cs</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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<pre style="margin: 0;">+<span id="LC500" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC501" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">tyOracle</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">nabla_ty_st</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span><span class="p">)</span> <span class="n" style="color: #333;">new_ty_cs</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC503" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty_st'</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC506" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;"><span class="idiff left">delta'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">delta</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a_ty_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty_st'</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;"><span class="idiff left">nabla'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nabla</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a_ty_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty_st'</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC505" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">recheck_complete_sets</span></span>
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<pre style="margin: 0;">-<span id="LC508" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">ensureAll<span class="idiff left">PossibleMatchesInhabited</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a'</span></span>
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<pre style="margin: 0;">-<span id="LC509" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC506" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">ensureAll<span class="idiff left">Inhabited</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a'</span></span>
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<pre style="margin: 0;">+<span id="LC507" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC509" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -618,21 +616,46 @@ warning messages (which can be alleviated by someone with enough dedication).</td>
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<pre style="margin: 0;"> <span id="LC616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC617" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC618" class="line" lang="haskell"><span class="cd">-- | A 'SatisfiabilityCheck' based on new term-level constraints.</span></span>
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<pre style="margin: 0;">-<span id="LC621" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns a new '<span class="idiff left right">Delt</span>a' if the new constraints are compatible with existing</span></span>
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<pre style="margin: 0;">+<span id="LC619" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns a new '<span class="idiff left right">Nabl</span>a' if the new constraints are compatible with existing</span></span>
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ones.</span></span>
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<pre style="margin: 0;"> <span id="LC621" class="line" lang="haskell"><span class="n" style="color: #333;">tmIsSatisfiable</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">TmCt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SatisfiabilityCheck</span></span>
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<pre style="margin: 0;">-<span id="LC624" class="line" lang="haskell"><span class="n" style="color: #333;">tmIsSatisfiable</span> <span class="n" style="color: #333;">new_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SC</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">runMaybeT</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">foldlM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addTmCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">new_tm_cs</span></span>
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"><span class="n" style="color: #333;">tmIsSatisfiable</span> <span class="n" style="color: #333;">new_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SC</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">runMaybeT</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">foldlM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addTmCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">new_tm_cs</span></span>
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<pre style="margin: 0;"> <span id="LC623" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC624" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------</span></span>
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<pre style="margin: 0;"> <span id="LC625" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Looking up VarInfo</span></span>
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<pre style="margin: 0;"> <span id="LC626" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC627" class="line" lang="haskell"><span class="n" style="color: #333;">emptyVarInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span></span>
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<pre style="margin: 0;">-<span id="LC630" class="line" lang="haskell"><span class="n" style="color: #333;">emptyVarInfo</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">emptyPmAltConSet</span> <span class="kt" style="color: #458; font-weight: 600;">NoPM</span></span>
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<pre style="margin: 0;">+<span id="LC628" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We could initialise @bot@ to @Just False@ in case of an unlifted type here,</span></span>
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<pre style="margin: 0;">+<span id="LC629" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but it's cleaner to let the user of the constraint solver take care of this.</span></span>
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<pre style="margin: 0;">+<span id="LC630" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- After all, there are also strict fields, the unliftedness of which isn't</span></span>
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<pre style="margin: 0;">+<span id="LC631" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- evident in the type. So treating unlifted types here would never be</span></span>
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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- sufficient anyway.</span></span>
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"><span class="n" style="color: #333;">emptyVarInfo</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">emptyPmAltConSet</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span> <span class="kt" style="color: #458; font-weight: 600;">NoPM</span></span>
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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC635" class="line" lang="haskell"><span class="n" style="color: #333;">lookupVarInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span></span>
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (lookupVarInfo tms x) tells what we know about 'x'</span></span>
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<pre style="margin: 0;"> <span id="LC637" class="line" lang="haskell"><span class="n" style="color: #333;">lookupVarInfo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="p">(</span><span class="n" style="color: #333;">emptyVarInfo</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">lookupSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC639" class="line" lang="haskell"><span class="cd">-- | Like @lookupVarInfo ts x@, but @lookupVarInfo ts x = (y, vi)@ also looks</span></span>
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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- through newtype constructors. We have @x ~ N1 (... (Nk y))@ such that the</span></span>
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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returned @y@ doesn't have a positive newtype constructor constraint</span></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- associated with it (yet). The 'VarInfo' returned is that of @y@'s</span></span>
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<pre style="margin: 0;">+<span id="LC643" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- representative.</span></span>
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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Careful, this means that @idType x@ might be different to @idType y@, even</span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- modulo type normalisation!</span></span>
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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also Note [Coverage checking Newtype matches].</span></span>
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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"><span class="n" style="color: #333;">lookupVarInfoNT</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"><span class="n" style="color: #333;">lookupVarInfoNT</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupVarInfo</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">VI</span><span class="p">{</span> <span class="n" style="color: #333;">vi_pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">as_newtype</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">y</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">lookupVarInfoNT</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC653" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC654" class="line" lang="haskell"> <span class="n" style="color: #333;">as_newtype</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToMaybe</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">go</span></span>
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655
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<pre style="margin: 0;">+<span id="LC655" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">),</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">y</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNewDataCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC658" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell"><span class="n" style="color: #333;">initPossibleMatches</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span></span>
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<pre style="margin: 0;"> <span id="LC660" class="line" lang="haskell"><span class="n" style="color: #333;">initPossibleMatches</span> <span class="n" style="color: #333;">ty_st</span> <span class="n" style="color: #333;">vi</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">VI</span><span class="p">{</span> <span class="n" style="color: #333;">vi_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">vi_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoPM</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC661" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- New evidence might lead to refined info on ty, in turn leading to discovery</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -669,13 +692,6 @@ initPossibleMatches ty_st vi@VI{ vi_ty = ty, vi_cache = NoPM } = do</td>
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692
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<pre style="margin: 0;"> <span id="LC692" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">vi</span><span class="p">{</span> <span class="n" style="color: #333;">vi_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">vi_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PM</span> <span class="p">(</span><span class="n" style="color: #333;">mkUniqDSet</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">cs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC693" class="line" lang="haskell"><span class="n" style="color: #333;">initPossibleMatches</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">vi</span></span>
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694
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC672" class="line" lang="haskell"><span class="cd">-- | @initLookupVarInfo ts x@ looks up the 'VarInfo' for @x@ in @ts@ and tries</span></span>
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<pre style="margin: 0;">-<span id="LC673" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to initialise the 'vi_cache' component if it was 'NoPM' through</span></span>
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<pre style="margin: 0;">-<span id="LC674" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'initPossibleMatches'.</span></span>
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<pre style="margin: 0;">-<span id="LC675" class="line" lang="haskell"><span class="n" style="color: #333;">initLookupVarInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span></span>
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<pre style="margin: 0;">-<span id="LC676" class="line" lang="haskell"><span class="n" style="color: #333;">initLookupVarInfo</span> <span class="kt" style="color: #458; font-weight: 600;">MkDelta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">,</span> <span class="n" style="color: #333;">delta_ty_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty_st</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">-<span id="LC677" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">initPossibleMatches</span> <span class="n" style="color: #333;">ty_st</span> <span class="p">(</span><span class="n" style="color: #333;">lookupVarInfo</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC678" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC695" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [COMPLETE sets on data families]</span></span>
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<pre style="margin: 0;"> <span id="LC696" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC697" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">User-defined COMPLETE sets involving data families are attached to the family</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -720,22 +736,11 @@ TyCon, so tc_rep = tc_fam afterwards.</td>
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<pre style="margin: 0;"> <span id="LC736" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC737" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC738" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC723" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Exported utility functions querying '<span class="idiff left right">Delt</span>a'</span></span>
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<pre style="margin: 0;">+<span id="LC739" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Exported utility functions querying '<span class="idiff left right">Nabl</span>a'</span></span>
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<pre style="margin: 0;"> <span id="LC740" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC725" class="line" lang="haskell"><span class="cd">-- | Check whether adding a constraint @x ~ BOT@ to 'Delta' succeeds.</span></span>
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<pre style="margin: 0;">-<span id="LC726" class="line" lang="haskell"><span class="n" style="color: #333;">canDiverge</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC727" class="line" lang="haskell"><span class="n" style="color: #333;">canDiverge</span> <span class="n" style="color: #333;">delta</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkDelta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">-<span id="LC728" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">neg</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupVarInfo</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">-<span id="LC729" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isEmptyPmAltConSet</span> <span class="n" style="color: #333;">neg</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">pos_can_diverge</span> <span class="n" style="color: #333;">pos</span></span>
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<pre style="margin: 0;">-<span id="LC730" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC731" class="line" lang="haskell"> <span class="n" style="color: #333;">pos_can_diverge</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">),</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">y</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC732" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Divergence of Newtype matches]</span></span>
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<pre style="margin: 0;">-<span id="LC733" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNewTyCon</span> <span class="p">(</span><span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canDiverge</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">-<span id="LC734" class="line" lang="haskell"> <span class="n" style="color: #333;">pos_can_diverge</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC735" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC736" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Divergence of Newtype matches]</span></span>
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<pre style="margin: 0;">-<span id="LC737" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC738" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Newtypes behave rather strangely when compared to ordinary DataCons. In a</span></span>
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<pre style="margin: 0;">+<span id="LC741" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Coverage checking Newtype matches]</span></span>
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<pre style="margin: 0;">+<span id="LC742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC743" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Newtypes have quite peculiar match semantics compared to ordinary DataCons. In a</span></span>
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<pre style="margin: 0;"> <span id="LC744" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pattern-match, they behave like a irrefutable (lazy) match, but for inhabitation</span></span>
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<pre style="margin: 0;"> <span id="LC745" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">testing purposes (e.g. at construction sites), they behave rather like a DataCon</span></span>
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<pre style="margin: 0;"> <span id="LC746" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with a *strict* field, because they don't contribute their own bottom and are</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -750,19 +755,21 @@ This distinction becomes apparent in #17248:</td>
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<pre style="margin: 0;"> <span id="LC755" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC756" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we treat Newtypes like we treat regular DataCons, we would mark the third</span></span>
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<pre style="margin: 0;"> <span id="LC757" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">clause as redundant, which clearly is unsound. The solution:</span></span>
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<pre style="margin: 0;">-<span id="LC753" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. When compiling the PmCon guard in 'pmCompileTree', don't add a @DivergeIf@,</span></span>
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<pre style="margin: 0;">-<span id="LC754" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> because the match will never diverge.</span></span>
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<pre style="margin: 0;">-<span id="LC755" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Regard @T2 x@ as 'canDiverge' iff @x@ 'canDiverge'. E.g. @T2 x ~ _|_@ <=></span></span>
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<pre style="margin: 0;">-<span id="LC756" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> @x ~ _|_@. This way, the third clause will still be marked as inaccessible</span></span>
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<pre style="margin: 0;">-<span id="LC757" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RHS instead of redundant.</span></span>
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<pre style="margin: 0;">-<span id="LC758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. When testing for inhabitants ('mkOneConFull'), we regard the newtype field as</span></span>
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<pre style="margin: 0;">-<span id="LC759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> strict, so that the newtype is inhabited iff its field is inhabited.</span></span>
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<pre style="margin: 0;">+<span id="LC758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. 'isPmAltConMatchStrict' returns False for newtypes, indicating that a</span></span>
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<pre style="margin: 0;">+<span id="LC759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype match is lazy.</span></span>
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<pre style="margin: 0;">+<span id="LC760" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. When we find @x ~ T2 y@, transfer all constraints on @x@ (which involve @⊥@)</span></span>
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<pre style="margin: 0;">+<span id="LC761" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to @y@, similar to what 'equate' does, and don't add a @x /~ ⊥@ constraint.</span></span>
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This way, the third clause will still be marked as inaccessible RHS instead</span></span>
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of redundant. This is ensured by calling 'lookupVarInfoNT'.</span></span>
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. Immediately reject when we find @x /~ T2@.</span></span>
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<pre style="margin: 0;">+<span id="LC765" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Handling of Newtypes is also described in the Appendix of the Lower Your Guards paper,</span></span>
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where you can find the solution in a perhaps more digestible format.</span></span>
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<pre style="margin: 0;"> <span id="LC767" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC762" class="line" lang="haskell"><span class="n" style="color: #333;">lookupRefuts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Uniquable</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"><span class="n" style="color: #333;">lookupRefuts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Uniquable</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Unfortunately we need the extra bit of polymorphism and the unfortunate</span></span>
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<pre style="margin: 0;"> <span id="LC771" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- duplication of lookupVarInfo here.</span></span>
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<pre style="margin: 0;">-<span id="LC765" class="line" lang="haskell"><span class="n" style="color: #333;">lookupRefuts</span> <span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left">Delta</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDIE</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="p">}</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"><span class="n" style="color: #333;">lookupRefuts</span> <span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left">Nabla</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDIE</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="p">}</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC773" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupUDFM_Directly</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">getUnique</span> <span class="n" style="color: #333;">k</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC774" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC775" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Indirect</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pmAltConSetElems</span> <span class="p">(</span><span class="n" style="color: #333;">vi_neg</span> <span class="p">(</span><span class="n" style="color: #333;">lookupVarInfo</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">y</span><span class="p">))</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -772,10 +779,10 @@ isDataConSolution :: (PmAltCon, [TyVar], [Id]) -> Bool</td>
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="haskell"><span class="n" style="color: #333;">isDataConSolution</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">),</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC780" class="line" lang="haskell"><span class="n" style="color: #333;">isDataConSolution</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC775" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @lookupSolution <span class="idiff left right">delt</span>a x@ picks a single solution ('vi_pos') of @x@ from</span></span>
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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @lookupSolution <span class="idiff left right">nabl</span>a x@ picks a single solution ('vi_pos') of @x@ from</span></span>
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<pre style="margin: 0;"> <span id="LC783" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- possibly many, preferring 'RealDataCon' solutions whenever possible.</span></span>
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<pre style="margin: 0;">-<span id="LC777" class="line" lang="haskell"><span class="n" style="color: #333;">lookupSolution</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">])</span></span>
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778
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<pre style="margin: 0;">-<span id="LC778" class="line" lang="haskell"><span class="n" style="color: #333;">lookupSolution</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">case</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vi_pos</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">lookupVarInfo</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">delta_tm_st</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span><span class="p">)</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"><span class="n" style="color: #333;">lookupSolution</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"><span class="n" style="color: #333;">lookupSolution</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">case</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vi_pos</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">lookupVarInfo</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">nabla_tm_st</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span><span class="p">)</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC786" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"> <span class="n" style="color: #333;">pos</span></span>
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">sol</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">find</span> <span class="n" style="color: #333;">isDataConSolution</span> <span class="n" style="color: #333;">pos</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">sol</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="842" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -842,13 +849,13 @@ instance Outputable PmCt where</td>
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmTyCt</span> <span class="n" style="color: #333;">pred_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pred_ty</span></span>
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843
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850
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<pre style="margin: 0;"> <span id="LC850" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmTmCt</span> <span class="n" style="color: #333;">tm_ct</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tm_ct</span></span>
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851
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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC845" class="line" lang="haskell"><span class="cd">-- | Adds new constraints to '<span class="idiff left right">Delt</span>a' and returns 'Nothing' if that leads to a</span></span>
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<pre style="margin: 0;">+<span id="LC852" class="line" lang="haskell"><span class="cd">-- | Adds new constraints to '<span class="idiff left right">Nabl</span>a' and returns 'Nothing' if that leads to a</span></span>
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- contradiction.</span></span>
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<pre style="margin: 0;">-<span id="LC847" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmCts</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmCts</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC855" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TmState invariants].</span></span>
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<pre style="margin: 0;">-<span id="LC849" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCts</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCts</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">ty_cts</span><span class="p">,</span> <span class="n" style="color: #333;">tm_cts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionTyTmCts</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;">-<span id="LC851" class="line" lang="haskell"> <span class="n" style="color: #333;">runSatisfiabilityCheck</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mconcat</span></span>
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<pre style="margin: 0;">+<span id="LC858" class="line" lang="haskell"> <span class="n" style="color: #333;">runSatisfiabilityCheck</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mconcat</span></span>
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">tyIsSatisfiable</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">ty_cts</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tmIsSatisfiable</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">tm_cts</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"> <span class="p">]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -861,44 +868,40 @@ partitionTyTmCts = partitionEithers . map to_either . toList</td>
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"><span class="cd">-- | Adds a single term constraint by dispatching to the various term oracle</span></span>
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- functions.</span></span>
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<pre style="margin: 0;">-<span id="LC864" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmCt</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeT</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span></span>
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<pre style="margin: 0;">-<span id="LC865" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCt</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmVarCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">y</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addVarCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">-<span id="LC866" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCt</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmCoreCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">e</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addCoreCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">-<span id="LC867" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCt</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">con</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tvs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC868" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCt</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmNotConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">con</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addNotConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span></span>
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869
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<pre style="margin: 0;">-<span id="LC869" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCt</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmBotCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addBotCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">-<span id="LC870" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCt</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmNotBotCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addNotBotCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">x</span></span>
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871
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<pre style="margin: 0;">+<span id="LC871" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmCt</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeT</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span></span>
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872
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<pre style="margin: 0;">+<span id="LC872" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCt</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmVarCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">y</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addVarCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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873
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<pre style="margin: 0;">+<span id="LC873" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCt</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmCoreCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">e</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addCoreCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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874
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCt</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">con</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tvs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC875" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCt</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmNotConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">con</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addNotConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;">+<span id="LC876" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCt</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmBotCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addBotCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">x</span></span>
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877
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCt</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmNotBotCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addNotBotCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">x</span></span>
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878
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<pre style="margin: 0;"> <span id="LC878" class="line" lang="haskell"></span>
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879
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"><span class="cd">-- | Adds the constraint @x ~ ⊥@, e.g. that evaluation of a particular 'Id' @x@</span></span>
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<pre style="margin: 0;">-<span id="LC873" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- surely diverges.</span></span>
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<pre style="margin: 0;">-<span id="LC874" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Only that's a lie, because we don't currently preserve the fact in 'Delta'</span></span>
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876
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- after we checked compatibility. See Note [Preserving TmBotCt]</span></span>
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877
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<pre style="margin: 0;">-<span id="LC877" class="line" lang="haskell"><span class="n" style="color: #333;">addBotCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span></span>
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878
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<pre style="margin: 0;">-<span id="LC878" class="line" lang="haskell"><span class="n" style="color: #333;">addBotCt</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">x</span></span>
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879
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<pre style="margin: 0;">-<span id="LC879" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">canDiverge</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">delta</span></span>
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880
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<pre style="margin: 0;">-<span id="LC880" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mzero</span></span>
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<pre style="margin: 0;">-<span id="LC881" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Preserving TmBotCt]</span></span>
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<pre style="margin: 0;">-<span id="LC883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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884
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<pre style="margin: 0;">-<span id="LC884" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Whenever we add a new constraint to 'Delta' via 'addTmCt', we want to check it</span></span>
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<pre style="margin: 0;">-<span id="LC885" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for compatibility with existing constraints in the modeled indert set and then</span></span>
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886
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<pre style="margin: 0;">-<span id="LC886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">add it the constraint itself to the inert set.</span></span>
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887
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<pre style="margin: 0;">-<span id="LC887" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For a 'TmBotCt' @x ~ ⊥@ we don't actually add it to the inert set after checking</span></span>
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888
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<pre style="margin: 0;">-<span id="LC888" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it for compatibility with 'Delta'.</span></span>
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889
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<pre style="margin: 0;">-<span id="LC889" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And that is fine in the context of the patter-match checking algorithm!</span></span>
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890
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<pre style="margin: 0;">-<span id="LC890" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Whenever we add a 'TmBotCt' (we only do so for checking divergence of bang</span></span>
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891
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<pre style="margin: 0;">-<span id="LC891" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">patterns and strict constructor matches), we don't add any more constraints to</span></span>
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892
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<pre style="margin: 0;">-<span id="LC892" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the inert set afterwards, so we don't need to preserve it.</span></span>
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893
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<pre style="margin: 0;">-<span id="LC893" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- surely diverges. Quite similar to 'addConCt', only that it only cares about</span></span>
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881
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<pre style="margin: 0;">+<span id="LC881" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ⊥.</span></span>
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<pre style="margin: 0;">+<span id="LC882" class="line" lang="haskell"><span class="n" style="color: #333;">addBotCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"><span class="n" style="color: #333;">addBotCt</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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884
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">vi</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="p">{</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bot</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupVarInfoNT</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_tm_st</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC885" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">bot</span> <span class="kr" style="font-weight: 600;">of</span></span>
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886
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<pre style="margin: 0;">+<span id="LC886" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mzero</span> <span class="c1" style="color: #998; font-style: italic;">-- There was x /~ ⊥. Contradiction!</span></span>
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla</span> <span class="c1" style="color: #998; font-style: italic;">-- There already is x ~ ⊥. Nothing left to do</span></span>
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<pre style="margin: 0;">+<span id="LC888" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="c1" style="color: #998; font-style: italic;">-- We add x ~ ⊥</span></span>
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<pre style="margin: 0;">+<span id="LC889" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">vi'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vi</span><span class="p">{</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC890" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">vi'</span><span class="p">)</span> <span class="n" style="color: #333;">reps</span><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC891" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC892" class="line" lang="haskell"><span class="cd">-- | Record a @x ~/ K@ constraint, e.g. that a particular 'Id' @x@ can't</span></span>
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<pre style="margin: 0;">-<span id="LC896" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- take the shape of a 'PmAltCon' @K@ in the '<span class="idiff left right">Delt</span>a' and return @Nothing@ if</span></span>
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<pre style="margin: 0;">+<span id="LC893" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- take the shape of a 'PmAltCon' @K@ in the '<span class="idiff left right">Nabl</span>a' and return @Nothing@ if</span></span>
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<pre style="margin: 0;"> <span id="LC894" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that leads to a contradiction.</span></span>
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<pre style="margin: 0;"> <span id="LC895" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TmState invariants].</span></span>
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<pre style="margin: 0;">-<span id="LC899" class="line" lang="haskell"><span class="n" style="color: #333;">addNotConCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span></span>
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<pre style="margin: 0;">-<span id="LC900" class="line" lang="haskell"><span class="n" style="color: #333;">addNotConCt</span> <span class="n" style="color: #333;">delta</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkDelta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">nalt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC901" class="line" lang="haskell"> <span class="n" style="color: #333;">vi</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">pm</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="p">(</span><span class="n" style="color: #333;">initLookupVarInfo</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC896" class="line" lang="haskell"><span class="n" style="color: #333;">addNotConCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<pre style="margin: 0;">+<span id="LC897" class="line" lang="haskell"><span class="n" style="color: #333;">addNotConCt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">))</span></span>
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898
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<pre style="margin: 0;">+<span id="LC898" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNewDataCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mzero</span> <span class="c1" style="color: #998; font-style: italic;">-- (3) in Note [Coverage checking Newtype matches]</span></span>
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<pre style="margin: 0;">+<span id="LC899" class="line" lang="haskell"><span class="n" style="color: #333;">addNotConCt</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span><span class="p">)</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">nalt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC900" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For good performance, it's important to initPossibleMatches here.</span></span>
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<pre style="margin: 0;">+<span id="LC901" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Otherwise we can't mark nalt as matched later on, incurring unnecessary</span></span>
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<pre style="margin: 0;">+<span id="LC902" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inhabitation tests for nalt.</span></span>
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903
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<pre style="margin: 0;">+<span id="LC903" class="line" lang="haskell"> <span class="n" style="color: #333;">vi</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">neg</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pm</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">initPossibleMatches</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_ty_st</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC904" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">lookupVarInfo</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC905" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. Bail out quickly when nalt contradicts a solution</span></span>
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<pre style="margin: 0;"> <span id="LC906" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">contradicts</span> <span class="n" style="color: #333;">nalt</span> <span class="p">(</span><span class="n" style="color: #333;">cl</span><span class="p">,</span> <span class="n" style="color: #333;">_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqPmAltCon</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">nalt</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Equal</span></span>
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<pre style="margin: 0;"> <span id="LC907" class="line" lang="haskell"> <span class="n" style="color: #333;">guard</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">contradicts</span> <span class="n" style="color: #333;">nalt</span><span class="p">)</span> <span class="n" style="color: #333;">pos</span><span class="p">))</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -910,13 +913,14 @@ addNotConCt delta@MkDelta{ delta_tm_st = TmSt env reps } x nalt = do</td>
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<pre style="margin: 0;"> <span id="LC913" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Completeness checking with required Thetas]</span></span>
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<pre style="margin: 0;"> <span id="LC914" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">hasRequiredTheta</span> <span class="n" style="color: #333;">nalt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg</span></span>
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<pre style="margin: 0;"> <span id="LC915" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendPmAltConSet</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">nalt</span></span>
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<pre style="margin: 0;">-<span id="LC913" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">vi_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vi</span><span class="p">{</span> <span class="n" style="color: #333;">vi_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg'</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC916" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">isPmAltConMatchStrict</span> <span class="n" style="color: #333;">nalt</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC917" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">vi1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vi</span><span class="p">{</span> <span class="n" style="color: #333;">vi_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg'</span><span class="p">,</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC918" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 3. Make sure there's at least one other possible constructor</span></span>
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<pre style="margin: 0;">-<span id="LC915" class="line" lang="haskell"> <span class="n" style="color: #333;">vi<span class="idiff left right">'</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">nalt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC919" class="line" lang="haskell"> <span class="n" style="color: #333;">vi<span class="idiff left right">2</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">nalt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC920" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl</span></span>
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<pre style="margin: 0;">-<span id="LC917" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">MaybeT</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ensureInhabited</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">delta</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vi_ext</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vi_cache</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">markMatched</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cl</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pm</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">})</span></span></span>
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<pre style="margin: 0;">-<span id="LC918" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">vi<span class="idiff left right">_ext</span></span></span>
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<pre style="margin: 0;">-<span id="LC919" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">delta_tm_st</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmSt</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">setEntrySDIE</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">vi'</span></span><span class="p">)</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC921" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left">ensureInhabited</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nabla</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vi1</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vi_cache</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">markMatched</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cl</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pm</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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<pre style="margin: 0;">+<span id="LC922" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">vi<span class="idiff left right">1</span></span></span>
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<pre style="margin: 0;">+<span id="LC923" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nabla_tm_st</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmSt</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">setEntrySDIE</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">vi2</span></span><span class="p">)</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC924" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC925" class="line" lang="haskell"><span class="n" style="color: #333;">hasRequiredTheta</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC926" class="line" lang="haskell"><span class="n" style="color: #333;">hasRequiredTheta</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">notNull</span> <span class="n" style="color: #333;">req_theta</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -979,100 +983,104 @@ guessConLikeUnivTyArgsFromResTy _ res_ty (PatSynCon ps) = do</td>
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<pre style="margin: 0;"> <span id="LC983" class="line" lang="haskell"> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcMatchTy</span> <span class="n" style="color: #333;">con_res_ty</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC984" class="line" lang="haskell"> <span class="n" style="color: #333;">traverse</span> <span class="p">(</span><span class="n" style="color: #333;">lookupTyVar</span> <span class="n" style="color: #333;">subst</span><span class="p">)</span> <span class="n" style="color: #333;">univ_tvs</span></span>
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985
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<pre style="margin: 0;"> <span id="LC985" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC982" class="line" lang="haskell"><span class="cd">-- | Adds the constraint @x ~/ ⊥@ to 'Delta'.</span></span>
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<pre style="margin: 0;">+<span id="LC986" class="line" lang="haskell"><span class="cd">-- | Adds the constraint @x ~/ ⊥@ to 'Nabla'. Quite similar to 'addNotConCt',</span></span>
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<pre style="margin: 0;">+<span id="LC987" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but only cares for the ⊥ "constructor".</span></span>
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<pre style="margin: 0;">+<span id="LC988" class="line" lang="haskell"><span class="n" style="color: #333;">addNotBotCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<pre style="margin: 0;">+<span id="LC989" class="line" lang="haskell"><span class="n" style="color: #333;">addNotBotCt</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC990" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">vi</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="p">{</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bot</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupVarInfoNT</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_tm_st</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC991" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">bot</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC992" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mzero</span> <span class="c1" style="color: #998; font-style: italic;">-- There was x ~ ⊥. Contradiction!</span></span>
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<pre style="margin: 0;">+<span id="LC993" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla</span> <span class="c1" style="color: #998; font-style: italic;">-- There already is x /~ ⊥. Nothing left to do</span></span>
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<pre style="margin: 0;">+<span id="LC994" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="c1" style="color: #998; font-style: italic;">-- We add x /~ ⊥ and test if x is still inhabited</span></span>
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<pre style="margin: 0;">+<span id="LC995" class="line" lang="haskell"> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ensureInhabited</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">vi</span><span class="p">{</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC996" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span> <span class="n" style="color: #333;">reps</span><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC997" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC998" class="line" lang="haskell"><span class="cd">-- | Returns (Just vi) if at least one member of each ConLike in the COMPLETE</span></span>
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<pre style="margin: 0;">+<span id="LC999" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- set satisfies the oracle</span></span>
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<pre style="margin: 0;">+<span id="LC1000" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC1001" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Internally uses and updates the ConLikeSets in vi_cache.</span></span>
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1002
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<pre style="margin: 0;"> <span id="LC1002" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC984" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- But doesn't really commit to upholding that constraint in the future. This</span></span>
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985
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<pre style="margin: 0;">-<span id="LC985" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- will be rectified in a follow-up patch. The status quo should work good</span></span>
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986
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<pre style="margin: 0;">-<span id="LC986" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- enough for now.</span></span>
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<pre style="margin: 0;">-<span id="LC987" class="line" lang="haskell"><span class="n" style="color: #333;">addNotBotCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span></span>
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<pre style="margin: 0;">-<span id="LC988" class="line" lang="haskell"><span class="n" style="color: #333;">addNotBotCt</span> <span class="n" style="color: #333;">delta</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkDelta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC989" class="line" lang="haskell"> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">initLookupVarInfo</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">-<span id="LC990" class="line" lang="haskell"> <span class="n" style="color: #333;">vi'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ensureInhabited</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">vi</span></span>
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<pre style="margin: 0;">-<span id="LC991" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- vi' has probably constructed and then thinned out some PossibleMatches.</span></span>
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<pre style="margin: 0;">-<span id="LC992" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We want to cache that work</span></span>
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<pre style="margin: 0;">-<span id="LC993" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">delta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">vi'</span><span class="p">)</span> <span class="n" style="color: #333;">reps</span><span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC994" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC995" class="line" lang="haskell"><span class="n" style="color: #333;">ensureInhabited</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC996" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Returns (Just vi) if at least one member of each ConLike in the COMPLETE</span></span>
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<pre style="margin: 0;">-<span id="LC997" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- set satisfies the oracle</span></span>
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998
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<pre style="margin: 0;">-<span id="LC998" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC999" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Internally uses and updates the ConLikeSets in vi_cache.</span></span>
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1000
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<pre style="margin: 0;">-<span id="LC1000" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1001
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<pre style="margin: 0;">-<span id="LC1001" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: Does /not/ filter each ConLikeSet with the oracle; members may</span></span>
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1002
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<pre style="margin: 0;">-<span id="LC1002" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- remain that do not statisfy it. This lazy approach just</span></span>
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1003
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<pre style="margin: 0;">-<span id="LC1003" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- avoids doing unnecessary work.</span></span>
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1004
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<pre style="margin: 0;">-<span id="LC1004" class="line" lang="haskell"><span class="n" style="color: #333;">ensureInhabited</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fmap</span> <span class="p">(</span><span class="n" style="color: #333;">set_cache</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">test</span> <span class="p">(</span><span class="n" style="color: #333;">vi_cache</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- This would be much less tedious with lenses</span></span>
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<pre style="margin: 0;">+<span id="LC1003" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: Does /not/ filter each ConLikeSet with the oracle; members may</span></span>
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1004
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<pre style="margin: 0;">+<span id="LC1004" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- remain that do not statisfy it. This lazy approach just</span></span>
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1005
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<pre style="margin: 0;">+<span id="LC1005" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- avoids doing unnecessary work.</span></span>
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"><span class="n" style="color: #333;">ensureInhabited</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span></span>
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"><span class="n" style="color: #333;">ensureInhabited</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">vi_bot</span> <span class="n" style="color: #333;">vi</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC1008" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">vi</span> <span class="c1" style="color: #998; font-style: italic;">-- The |-Bot rule from the paper</span></span>
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1009
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<pre style="margin: 0;">+<span id="LC1009" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">vi</span></span>
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1010
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<pre style="margin: 0;">+<span id="LC1010" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">lift</span> <span class="p">(</span><span class="n" style="color: #333;">initPossibleMatches</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_ty_st</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="n" style="color: #333;">inst_complete_sets</span></span>
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1005
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1011
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<pre style="margin: 0;"> <span id="LC1011" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1006
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<pre style="margin: 0;">-<span id="LC1006" class="line" lang="haskell"> <span class="n" style="color: #333;">set_cache</span> <span class="n" style="color: #333;">vi</span> <span class="n" style="color: #333;">cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vi</span> <span class="p">{</span> <span class="n" style="color: #333;">vi_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cache</span> <span class="p">}</span></span>
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1007
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<pre style="margin: 0;">-<span id="LC1007" class="line" lang="haskell"></span>
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1008
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<pre style="margin: 0;">-<span id="LC1008" class="line" lang="haskell"> <span class="n" style="color: #333;">test</span> <span class="kt" style="color: #458; font-weight: 600;">NoPM</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">NoPM</span><span class="p">)</span></span>
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1009
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<pre style="margin: 0;">-<span id="LC1009" class="line" lang="haskell"> <span class="n" style="color: #333;">test</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PM</span> <span class="n" style="color: #333;">ms</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runMaybeT</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PM</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">one_set</span> <span class="n" style="color: #333;">ms</span><span class="p">)</span></span>
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1010
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<pre style="margin: 0;">-<span id="LC1010" class="line" lang="haskell"></span>
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1011
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<pre style="margin: 0;">-<span id="LC1011" class="line" lang="haskell"> <span class="n" style="color: #333;">one_set</span> <span class="n" style="color: #333;">cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">find_one_inh</span> <span class="n" style="color: #333;">cs</span> <span class="p">(</span><span class="n" style="color: #333;">uniqDSetToList</span> <span class="n" style="color: #333;">cs</span><span class="p">)</span></span>
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1012
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<pre style="margin: 0;">-<span id="LC1012" class="line" lang="haskell"></span>
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1013
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<pre style="margin: 0;">-<span id="LC1013" class="line" lang="haskell"> <span class="n" style="color: #333;">find_one_inh</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ConLikeSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ConLike</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">ConLikeSet</span></span>
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1014
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<pre style="margin: 0;">-<span id="LC1014" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (find_one_inh cs cls) iterates over cls, deleting from cs</span></span>
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<pre style="margin: 0;">+<span id="LC1012" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | This is the |-Inst rule from the paper (section 4.5). Tries to</span></span>
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<pre style="margin: 0;">+<span id="LC1013" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- find an inhabitant in every complete set by instantiating with one their</span></span>
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<pre style="margin: 0;">+<span id="LC1014" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constructors. If there is any complete set where we can't find an</span></span>
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1015
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<pre style="margin: 0;">+<span id="LC1015" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inhabitant, the whole thing is uninhabited.</span></span>
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<pre style="margin: 0;">+<span id="LC1016" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_complete_sets</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span></span>
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1017
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<pre style="margin: 0;">+<span id="LC1017" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_complete_sets</span> <span class="n" style="color: #333;">vi</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">VI</span><span class="p">{</span> <span class="n" style="color: #333;">vi_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoPM</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">vi</span></span>
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_complete_sets</span> <span class="n" style="color: #333;">vi</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">VI</span><span class="p">{</span> <span class="n" style="color: #333;">vi_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PM</span> <span class="n" style="color: #333;">ms</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1019
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"> <span class="n" style="color: #333;">ms</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">cs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">inst_complete_set</span> <span class="n" style="color: #333;">vi</span> <span class="n" style="color: #333;">cs</span> <span class="p">(</span><span class="n" style="color: #333;">uniqDSetToList</span> <span class="n" style="color: #333;">cs</span><span class="p">))</span> <span class="n" style="color: #333;">ms</span></span>
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1020
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<pre style="margin: 0;">+<span id="LC1020" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">vi</span><span class="p">{</span> <span class="n" style="color: #333;">vi_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PM</span> <span class="n" style="color: #333;">ms</span> <span class="p">}</span></span>
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1021
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<pre style="margin: 0;">+<span id="LC1021" class="line" lang="haskell"></span>
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1022
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_complete_set</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ConLikeSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ConLike</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">ConLikeSet</span></span>
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1023
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (inst_complete_set cs cls) iterates over cls, deleting from cs</span></span>
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1015
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1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- any uninhabited elements of cls. Stop (returning Just cs)</span></span>
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1016
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- when you see an inhabited element; return Nothing if all</span></span>
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1017
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1026
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- are uninhabited</span></span>
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1018
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<pre style="margin: 0;">-<span id="LC1018" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">find_one_inh</span></span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mzero</span></span>
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1019
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<pre style="margin: 0;">-<span id="LC1019" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">find_one_inh</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cs</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">con</span></span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="n" style="color: #333;"><span class="idiff">cons</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lift</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff right">inh_test</span></span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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1027
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<pre style="margin: 0;">+<span id="LC1027" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">inst_complete_set</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">_</span></span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mzero</span></span>
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1028
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<pre style="margin: 0;">+<span id="LC1028" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">inst_complete_set</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vi</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cs</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">con</span></span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="n" style="color: #333;"><span class="idiff">cons</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lift</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">inst_and_test</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">vi</span></span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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1020
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1029
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<pre style="margin: 0;"> <span id="LC1029" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">cs</span></span>
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1021
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<pre style="margin: 0;">-<span id="LC1021" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left right">find_one_inh</span></span> <span class="p">(</span><span class="n" style="color: #333;">delOneFromUniqDSet</span> <span class="n" style="color: #333;">cs</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="n" style="color: #333;">cons</span></span>
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1030
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<pre style="margin: 0;">+<span id="LC1030" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left">inst_complete_set</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">vi</span></span> <span class="p">(</span><span class="n" style="color: #333;">delOneFromUniqDSet</span> <span class="n" style="color: #333;">cs</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="n" style="color: #333;">cons</span></span>
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1022
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1031
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<pre style="margin: 0;"> <span id="LC1031" class="line" lang="haskell"></span>
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1023
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<pre style="margin: 0;">-<span id="LC1023" class="line" lang="haskell"> <span class="n" style="color: #333;">in<span class="idiff left">h_test</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">::</span></span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1024
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<pre style="margin: 0;">-<span id="LC1024" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @in<span class="idiff left right">h</span>_test K@ Returns False if a non-bottom value @v::ty@ cannot possibly</span></span>
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1032
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<pre style="margin: 0;">+<span id="LC1032" class="line" lang="haskell"> <span class="n" style="color: #333;">in<span class="idiff left">st_and_test</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">VarInfo</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1033
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<pre style="margin: 0;">+<span id="LC1033" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @in<span class="idiff left right">st_and</span>_test K@ Returns False if a non-bottom value @v::ty@ cannot possibly</span></span>
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1025
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1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- be of form @K _ _ _@. Returning True is always sound.</span></span>
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1026
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1035
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<pre style="margin: 0;"> <span id="LC1035" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1027
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1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's like 'DataCon.dataConCannotMatch', but more clever because it takes</span></span>
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1028
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<pre style="margin: 0;">-<span id="LC1028" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the facts in <span class="idiff left right">Delt</span>a into account.</span></span>
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1029
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<pre style="margin: 0;">-<span id="LC1029" class="line" lang="haskell"> <span class="n" style="color: #333;">in<span class="idiff left right">h_test</span></span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1037
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<pre style="margin: 0;">+<span id="LC1037" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the facts in <span class="idiff left right">Nabl</span>a into account.</span></span>
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1038
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<pre style="margin: 0;">+<span id="LC1038" class="line" lang="haskell"> <span class="n" style="color: #333;">in<span class="idiff left">st_and_test</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">vi</span></span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1030
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1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGetFamInstEnvs</span></span>
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1031
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1040
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<pre style="margin: 0;"> <span id="LC1040" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">guessConLikeUnivTyArgsFromResTy</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">vi_ty</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span> <span class="n" style="color: #333;">con</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1032
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- be conservative about this</span></span>
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1033
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1034
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1043
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">_vars</span><span class="p">,</span> <span class="n" style="color: #333;">ty_cs</span><span class="p">,</span> <span class="n" style="color: #333;">strict_arg_tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkOneConFull</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">con</span></span>
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1035
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<pre style="margin: 0;">-<span id="LC1035" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"in<span class="idiff left right">h</span>_test"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty_cs</span><span class="p">)</span></span>
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1044
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<pre style="margin: 0;">+<span id="LC1044" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"in<span class="idiff left right">st_and</span>_test"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty_cs</span><span class="p">)</span></span>
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1036
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1045
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<pre style="margin: 0;"> <span id="LC1045" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- No need to run the term oracle compared to pmIsSatisfiable</span></span>
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1037
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<pre style="margin: 0;">-<span id="LC1037" class="line" lang="haskell"> <span class="n" style="color: #333;">fmap</span> <span class="n" style="color: #333;">isJust</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">runSatisfiabilityCheck</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mconcat</span></span>
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1046
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<pre style="margin: 0;">+<span id="LC1046" class="line" lang="haskell"> <span class="n" style="color: #333;">fmap</span> <span class="n" style="color: #333;">isJust</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">runSatisfiabilityCheck</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mconcat</span></span>
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1038
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1047
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<pre style="margin: 0;"> <span id="LC1047" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Important to pass False to tyIsSatisfiable here, so that we won't</span></span>
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1039
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<pre style="margin: 0;">-<span id="LC1039" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- recursively call ensureAll<span class="idiff left right">PossibleMatches</span>Inhabited, leading to an</span></span>
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1048
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<pre style="margin: 0;">+<span id="LC1048" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- recursively call ensureAllInhabited, leading to an</span></span>
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1040
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1049
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<pre style="margin: 0;"> <span id="LC1049" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- endless recursion.</span></span>
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1041
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1050
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<pre style="margin: 0;"> <span id="LC1050" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">tyIsSatisfiable</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ty_cs</span></span>
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1042
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1051
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<pre style="margin: 0;"> <span id="LC1051" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tysAreNonVoid</span> <span class="n" style="color: #333;">initRecTc</span> <span class="n" style="color: #333;">strict_arg_tys</span></span>
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1043
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1052
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<pre style="margin: 0;"> <span id="LC1052" class="line" lang="haskell"> <span class="p">]</span></span>
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1044
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1053
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<pre style="margin: 0;"> <span id="LC1053" class="line" lang="haskell"></span>
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1045
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1054
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<pre style="margin: 0;"> <span id="LC1054" class="line" lang="haskell"><span class="cd">-- | Checks if every 'VarInfo' in the term oracle has still an inhabited</span></span>
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1046
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<pre style="margin: 0;">-<span id="LC1046" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'vi_cache', considering the current type information in '<span class="idiff left right">Delt</span>a'.</span></span>
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1055
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<pre style="margin: 0;">+<span id="LC1055" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'vi_cache', considering the current type information in '<span class="idiff left right">Nabl</span>a'.</span></span>
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1047
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1056
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<pre style="margin: 0;"> <span id="LC1056" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This check is necessary after having matched on a GADT con to weed out</span></span>
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1048
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1057
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<pre style="margin: 0;"> <span id="LC1057" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- impossible matches.</span></span>
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1049
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<pre style="margin: 0;">-<span id="LC1049" class="line" lang="haskell"><span class="n" style="color: #333;">ensureAll<span class="idiff left">PossibleMatchesInhabited</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1050" class="line" lang="haskell"><span class="n" style="color: #333;">ensureAll<span class="idiff left">PossibleMatchesInhabited</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">delta</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkDelta</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span></span>
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1051
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<pre style="margin: 0;">-<span id="LC1051" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runMaybeT</span> <span class="p">(</span><span class="n" style="color: #333;">set_tm_cs_env</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverseSDIE</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1058" class="line" lang="haskell"><span class="n" style="color: #333;">ensureAll<span class="idiff left">Inhabited</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1059" class="line" lang="haskell"><span class="n" style="color: #333;">ensureAll<span class="idiff left">Inhabited</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nabla</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkNabla</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span></span>
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1060
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<pre style="margin: 0;">+<span id="LC1060" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runMaybeT</span> <span class="p">(</span><span class="n" style="color: #333;">set_tm_cs_env</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverseSDIE</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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1052
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1061
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<pre style="margin: 0;"> <span id="LC1061" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1053
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<pre style="margin: 0;">-<span id="LC1053" class="line" lang="haskell"> <span class="n" style="color: #333;">set_tm_cs_env</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">delta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span></span>
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1054
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<pre style="margin: 0;">-<span id="LC1054" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="o" style="font-weight: 600;">$</span></span>
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1055
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<pre style="margin: 0;">-<span id="LC1055" class="line" lang="haskell"> <span class="n" style="color: #333;">initPossibleMatches</span> <span class="p">(</span><span class="n" style="color: #333;">delta_ty_st</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="n" style="color: #333;">ensureInhabited</span> <span class="n" style="color: #333;">delta</span></span>
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1062
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<pre style="margin: 0;">+<span id="LC1062" class="line" lang="haskell"> <span class="n" style="color: #333;">set_tm_cs_env</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span></span>
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1063
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<pre style="margin: 0;">+<span id="LC1063" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ensureInhabited</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">vi</span></span>
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1056
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1064
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<pre style="margin: 0;"> <span id="LC1064" class="line" lang="haskell"></span>
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1057
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1065
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<pre style="margin: 0;"> <span id="LC1065" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------------------------------</span></span>
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1058
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1066
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<pre style="margin: 0;"> <span id="LC1066" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Term oracle unification procedure</span></span>
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1059
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1067
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<pre style="margin: 0;"> <span id="LC1067" class="line" lang="haskell"></span>
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1060
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1068
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<pre style="margin: 0;"> <span id="LC1068" class="line" lang="haskell"><span class="cd">-- | Adds a @x ~ y@ constraint by trying to unify two 'Id's and record the</span></span>
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1061
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<pre style="margin: 0;">-<span id="LC1061" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- gained knowledge in '<span class="idiff left right">Delt</span>a'.</span></span>
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1069
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<pre style="margin: 0;">+<span id="LC1069" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- gained knowledge in '<span class="idiff left right">Nabl</span>a'.</span></span>
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1062
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1070
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<pre style="margin: 0;"> <span id="LC1070" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1063
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<pre style="margin: 0;">-<span id="LC1063" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns @Nothing@ when there's a contradiction. Returns @Just <span class="idiff left right">delt</span>a@</span></span>
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1064
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<pre style="margin: 0;">-<span id="LC1064" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- when the constraint was compatible with prior facts, in which case @<span class="idiff left right">delt</span>a@</span></span>
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1071
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<pre style="margin: 0;">+<span id="LC1071" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns @Nothing@ when there's a contradiction. Returns @Just <span class="idiff left right">nabl</span>a@</span></span>
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1072
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<pre style="margin: 0;">+<span id="LC1072" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- when the constraint was compatible with prior facts, in which case @<span class="idiff left right">nabl</span>a@</span></span>
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1065
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1073
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<pre style="margin: 0;"> <span id="LC1073" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- has integrated the knowledge from the equality constraint.</span></span>
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1066
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1074
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<pre style="margin: 0;"> <span id="LC1074" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1067
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1075
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<pre style="margin: 0;"> <span id="LC1075" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TmState invariants].</span></span>
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1068
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<pre style="margin: 0;">-<span id="LC1068" class="line" lang="haskell"><span class="n" style="color: #333;">addVarCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeT</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span></span>
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<pre style="margin: 0;">-<span id="LC1069" class="line" lang="haskell"><span class="n" style="color: #333;">addVarCt</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkDelta</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">+<span id="LC1076" class="line" lang="haskell"><span class="n" style="color: #333;">addVarCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeT</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span></span>
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<pre style="margin: 0;">+<span id="LC1077" class="line" lang="haskell"><span class="n" style="color: #333;">addVarCt</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkNabla</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;"> <span id="LC1078" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's important that we never @equate@ two variables of the same equivalence</span></span>
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<pre style="margin: 0;"> <span id="LC1079" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- class, otherwise we might get cyclic substitutions.</span></span>
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1072
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<pre style="margin: 0;"> <span id="LC1080" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Cf. 'extendSubstAndSolve' and</span></span>
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1073
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1081
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @testsuite/tests/pmcheck/should_compile/CyclicSubst.hs@.</span></span>
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<pre style="margin: 0;">-<span id="LC1074" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">sameRepresentativeSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span></span>
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1075
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<pre style="margin: 0;">-<span id="LC1075" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">equate</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">+<span id="LC1082" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">sameRepresentativeSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span></span>
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<pre style="margin: 0;">+<span id="LC1083" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">equate</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;"> <span id="LC1084" class="line" lang="haskell"></span>
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1077
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<pre style="margin: 0;"> <span id="LC1085" class="line" lang="haskell"><span class="cd">-- | @equate ts@(TmSt env) x y@ merges the equivalence classes of @x@ and @y@ by</span></span>
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<pre style="margin: 0;"> <span id="LC1086" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- adding an indirection to the environment.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1081,12 +1089,12 @@ addVarCt delta@MkDelta{ delta_tm_st = TmSt env _ } x y</td>
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<pre style="margin: 0;"> <span id="LC1089" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Preconditions: @not (sameRepresentativeSDIE env x y)@</span></span>
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<pre style="margin: 0;"> <span id="LC1090" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC1091" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TmState invariants].</span></span>
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<pre style="margin: 0;">-<span id="LC1084" class="line" lang="haskell"><span class="n" style="color: #333;">equate</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeT</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span></span>
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<pre style="margin: 0;">-<span id="LC1085" class="line" lang="haskell"><span class="n" style="color: #333;">equate</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkDelta</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1092" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1092
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<pre style="margin: 0;">+<span id="LC1092" class="line" lang="haskell"><span class="n" style="color: #333;">equate</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeT</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span></span>
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1093
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<pre style="margin: 0;">+<span id="LC1093" class="line" lang="haskell"><span class="n" style="color: #333;">equate</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkNabla</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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1086
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1094
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<pre style="margin: 0;"> <span id="LC1094" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">sameRepresentativeSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="p">)</span></span>
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1087
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1095
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<pre style="margin: 0;"> <span id="LC1095" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">lookupSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">lookupSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1088
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<td class="diff-line-num new_line old" data-linenumber="1096" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1088" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="n" style="color: #333;">setIndirectSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="n" style="color: #333;">reps</span> <span class="p">})</span></span>
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1089
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<pre style="margin: 0;">-<span id="LC1089" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="n" style="color: #333;">setIndirectSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">reps</span> <span class="p">})</span></span>
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1096
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<pre style="margin: 0;">+<span id="LC1096" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="n" style="color: #333;">setIndirectSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="n" style="color: #333;">reps</span> <span class="p">})</span></span>
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1097
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<pre style="margin: 0;">+<span id="LC1097" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="n" style="color: #333;">setIndirectSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">reps</span> <span class="p">})</span></span>
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1090
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1098
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<pre style="margin: 0;"> <span id="LC1098" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Merge the info we have for x into the info for y</span></span>
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1091
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1099
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<pre style="margin: 0;"> <span id="LC1099" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">vi_x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">vi_y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1092
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1100
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<pre style="margin: 0;"> <span id="LC1100" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This assert will probably trigger at some point...</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1096" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1104" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1096,16 +1104,16 @@ equate delta@MkDelta{ delta_tm_st = TmSt env reps } x y</td>
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1096
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1104
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<pre style="margin: 0;"> <span id="LC1104" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">env_ind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIndirectSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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1097
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1105
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<pre style="margin: 0;"> <span id="LC1105" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then sum up the refinement counters</span></span>
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1098
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1106
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<pre style="margin: 0;"> <span id="LC1106" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">env_refs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env_ind</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">vi_y</span></span>
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1099
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<pre style="margin: 0;">-<span id="LC1099" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;"><span class="idiff left">delta_refs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">delta</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env_refs</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span></span>
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1107
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<pre style="margin: 0;">+<span id="LC1107" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;"><span class="idiff left">nabla_refs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nabla</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env_refs</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span></span>
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1108
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<pre style="margin: 0;"> <span id="LC1108" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and then gradually merge every positive fact we have on x into y</span></span>
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1101
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<pre style="margin: 0;">-<span id="LC1101" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">add_fact</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">cl</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tvs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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1102
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<pre style="margin: 0;">-<span id="LC1102" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">delta_pos</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">foldlM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">add_fact</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a_refs</span> <span class="p">(</span><span class="n" style="color: #333;">vi_pos</span> <span class="n" style="color: #333;">vi_x</span><span class="p">)</span></span>
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1109
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<pre style="margin: 0;">+<span id="LC1109" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">add_fact</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">cl</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tvs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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1110
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<pre style="margin: 0;">+<span id="LC1110" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">nabla_pos</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">foldlM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">add_fact</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a_refs</span> <span class="p">(</span><span class="n" style="color: #333;">vi_pos</span> <span class="n" style="color: #333;">vi_x</span><span class="p">)</span></span>
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1103
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1111
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<pre style="margin: 0;"> <span id="LC1111" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do the same for negative info</span></span>
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1104
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<pre style="margin: 0;">-<span id="LC1104" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">add_refut</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nalt</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addNotConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">nalt</span></span>
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1105
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<pre style="margin: 0;">-<span id="LC1105" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">delta_neg</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">foldlM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">add_refut</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a_pos</span> <span class="p">(</span><span class="n" style="color: #333;">pmAltConSetElems</span> <span class="p">(</span><span class="n" style="color: #333;">vi_neg</span> <span class="n" style="color: #333;">vi_x</span><span class="p">))</span></span>
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1112
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<pre style="margin: 0;">+<span id="LC1112" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">add_refut</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nalt</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addNotConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">nalt</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1113" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1113
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<pre style="margin: 0;">+<span id="LC1113" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">nabla_neg</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">foldlM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">add_refut</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a_pos</span> <span class="p">(</span><span class="n" style="color: #333;">pmAltConSetElems</span> <span class="p">(</span><span class="n" style="color: #333;">vi_neg</span> <span class="n" style="color: #333;">vi_x</span><span class="p">))</span></span>
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1106
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1114
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<pre style="margin: 0;"> <span id="LC1114" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- vi_cache will be updated in addNotConCt, so we are good to</span></span>
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1107
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1115
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<pre style="margin: 0;"> <span id="LC1115" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- go!</span></span>
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1108
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<pre style="margin: 0;">-<span id="LC1108" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a_neg</span></span>
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1116
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<pre style="margin: 0;">+<span id="LC1116" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a_neg</span></span>
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1109
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1117
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<pre style="margin: 0;"> <span id="LC1117" class="line" lang="haskell"></span>
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1110
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1118
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<pre style="margin: 0;"> <span id="LC1118" class="line" lang="haskell"><span class="cd">-- | Add a @x ~ K tvs args ts@ constraint.</span></span>
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<pre style="margin: 0;"> <span id="LC1119" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @addConCt x K tvs args ts@ extends the substitution with a solution</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1113,9 +1121,9 @@ equate delta@MkDelta{ delta_tm_st = TmSt env reps } x y</td>
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1113
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1121
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<pre style="margin: 0;"> <span id="LC1121" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- have on @x@, reject (@Nothing@) otherwise.</span></span>
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1114
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1122
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<pre style="margin: 0;"> <span id="LC1122" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1115
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1123
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<pre style="margin: 0;"> <span id="LC1123" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TmState invariants].</span></span>
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1116
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<pre style="margin: 0;">-<span id="LC1116" class="line" lang="haskell"><span class="n" style="color: #333;">addConCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmAltCon</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TyVar</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeT</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span></span>
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1117
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<pre style="margin: 0;">-<span id="LC1117" class="line" lang="haskell"><span class="n" style="color: #333;">addConCt</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkDelta</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">delta_tm_st</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmSt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">reps</span></span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC1118" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">VI</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">neg</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cache</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lift</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">initLookupVarInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">delta</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC1124" class="line" lang="haskell"><span class="n" style="color: #333;">addConCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmAltCon</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TyVar</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeT</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span></span>
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1125
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<pre style="margin: 0;">+<span id="LC1125" class="line" lang="haskell"><span class="n" style="color: #333;">addConCt</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkNabla</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nabla_tm_st</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ts</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmSt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">reps</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1126
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<pre style="margin: 0;">+<span id="LC1126" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left">let</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">VI</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">neg</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bot</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cache</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lookupVarInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">x</span></span></span>
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1119
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1127
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<pre style="margin: 0;"> <span id="LC1127" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- First try to refute with a negative fact</span></span>
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1128
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<pre style="margin: 0;"> <span id="LC1128" class="line" lang="haskell"> <span class="n" style="color: #333;">guard</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">elemPmAltConSet</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">neg</span><span class="p">))</span></span>
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1121
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1129
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<pre style="margin: 0;"> <span id="LC1129" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then see if any of the other solutions (remember: each of them is an</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1131,10 +1139,19 @@ addConCt delta@MkDelta{ delta_tm_st = TmSt env reps } x alt tvs args = do</td>
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1131
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1139
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<pre style="margin: 0;"> <span id="LC1139" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">/=</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">other_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1132
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1140
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<pre style="margin: 0;"> <span id="LC1140" class="line" lang="haskell"> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"error"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">alt</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">other_args</span><span class="p">)</span></span>
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1133
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1141
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<pre style="margin: 0;"> <span id="LC1141" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tm_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipWithEqual</span> <span class="s" style="color: #d14;">"addConCt"</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarCt</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">other_args</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1134" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1134
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<pre style="margin: 0;">-<span id="LC1134" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">addPmCts</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">ty_cts</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">tm_cts</span><span class="p">)</span></span>
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1142
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<pre style="margin: 0;">+<span id="LC1142" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">addPmCts</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">ty_cts</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">tm_cts</span><span class="p">)</span></span>
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1135
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1143
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<pre style="margin: 0;"> <span id="LC1143" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1136
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1144
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<pre style="margin: 0;"> <span id="LC1144" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pos'</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">alt</span><span class="p">,</span> <span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">pos</span></span>
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1137
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<pre style="margin: 0;">-<span id="LC1137" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">delta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">pos'</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">cache</span><span class="p">))</span> <span class="n" style="color: #333;">reps</span><span class="p">}</span></span>
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1145
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<pre style="margin: 0;">+<span id="LC1145" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nabla_with</span> <span class="n" style="color: #333;">bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">pos'</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">bot</span> <span class="n" style="color: #333;">cache</span><span class="p">))</span> <span class="n" style="color: #333;">reps</span><span class="p">}</span></span>
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1146
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<pre style="margin: 0;">+<span id="LC1146" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do (2) in Note [Coverage checking Newtype matches]</span></span>
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1147
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<pre style="margin: 0;">+<span id="LC1147" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">alt</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1148
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<pre style="margin: 0;">+<span id="LC1148" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">),</span> <span class="p">[</span><span class="n" style="color: #333;">y</span><span class="p">])</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNewDataCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">-></span></span>
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1149
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<pre style="margin: 0;">+<span id="LC1149" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">bot</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1150
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<pre style="margin: 0;">+<span id="LC1150" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_with</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span><span class="p">)</span></span>
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1151
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<pre style="margin: 0;">+<span id="LC1151" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addBotCt</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_with</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span><span class="p">)</span> <span class="n" style="color: #333;">y</span></span>
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1152
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<pre style="margin: 0;">+<span id="LC1152" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addNotBotCt</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_with</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span><span class="p">)</span> <span class="n" style="color: #333;">y</span></span>
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1153
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<pre style="margin: 0;">+<span id="LC1153" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">isPmAltConMatchStrict</span> <span class="n" style="color: #333;">alt</span> <span class="p">)</span></span>
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1154
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<pre style="margin: 0;">+<span id="LC1154" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_with</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- strict match ==> not ⊥</span></span>
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1155
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<pre style="margin: 0;"> <span id="LC1155" class="line" lang="haskell"></span>
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1156
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<pre style="margin: 0;"> <span id="LC1156" class="line" lang="haskell"><span class="n" style="color: #333;">equateTys</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmCt</span><span class="p">]</span></span>
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1140
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1157
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<pre style="margin: 0;"> <span id="LC1157" class="line" lang="haskell"><span class="n" style="color: #333;">equateTys</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">us</span> <span class="o" style="font-weight: 600;">=</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1183,9 +1200,9 @@ mkInhabitationCandidate x dc = do</td>
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1183
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1200
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<pre style="margin: 0;"> <span id="LC1200" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- if it can. In this case, the candidates are the signature of the tycon, each</span></span>
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1184
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1201
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<pre style="margin: 0;"> <span id="LC1201" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- one accompanied by the term- and type- constraints it gives rise to.</span></span>
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1185
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1202
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<pre style="margin: 0;"> <span id="LC1202" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also Note [Checking EmptyCase Expressions]</span></span>
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1186
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<pre style="margin: 0;">-<span id="LC1186" class="line" lang="haskell"><span class="n" style="color: #333;">inhabitationCandidates</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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1203
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<pre style="margin: 0;">+<span id="LC1203" class="line" lang="haskell"><span class="n" style="color: #333;">inhabitationCandidates</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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1187
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<pre style="margin: 0;"> <span id="LC1204" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyCon</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">InhabitationCandidate</span><span class="p">]))</span></span>
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<pre style="margin: 0;">-<span id="LC1188" class="line" lang="haskell"><span class="n" style="color: #333;">inhabitationCandidates</span> <span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left">Delta</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a_ty_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty_st</span> <span class="p">}</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC1205" class="line" lang="haskell"><span class="n" style="color: #333;">inhabitationCandidates</span> <span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left">Nabla</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a_ty_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty_st</span> <span class="p">}</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC1206" class="line" lang="haskell"> <span class="n" style="color: #333;">pmTopNormaliseType</span> <span class="n" style="color: #333;">ty_st</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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1190
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<pre style="margin: 0;"> <span id="LC1207" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NoChange</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">alts_to_check</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1191
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1208
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<pre style="margin: 0;"> <span id="LC1208" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NormalisedByConstraints</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">alts_to_check</span> <span class="n" style="color: #333;">ty'</span> <span class="n" style="color: #333;">ty'</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1281,20 +1298,20 @@ we do the following:</td>
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1298
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<pre style="margin: 0;"> <span id="LC1298" class="line" lang="haskell"></span>
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1282
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1299
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<pre style="margin: 0;"> <span id="LC1299" class="line" lang="haskell"><span class="cd">-- | A 'SatisfiabilityCheck' based on "NonVoid ty" constraints, e.g. Will</span></span>
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1283
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<pre style="margin: 0;"> <span id="LC1300" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- check if the @strict_arg_tys@ are actually all inhabited.</span></span>
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1284
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<pre style="margin: 0;">-<span id="LC1284" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns the old '<span class="idiff left right">Delta' if all the types are non-void according to 'Delt</span>a'.</span></span>
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1301
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<pre style="margin: 0;">+<span id="LC1301" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns the old '<span class="idiff left right">Nabla' if all the types are non-void according to 'Nabl</span>a'.</span></span>
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1285
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1302
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<pre style="margin: 0;"> <span id="LC1302" class="line" lang="haskell"><span class="n" style="color: #333;">tysAreNonVoid</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SatisfiabilityCheck</span></span>
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1286
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<pre style="margin: 0;">-<span id="LC1286" class="line" lang="haskell"><span class="n" style="color: #333;">tysAreNonVoid</span> <span class="n" style="color: #333;">rec_env</span> <span class="n" style="color: #333;">strict_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SC</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1287
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<pre style="margin: 0;">-<span id="LC1287" class="line" lang="haskell"> <span class="n" style="color: #333;">all_non_void</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkAllNonVoid</span> <span class="n" style="color: #333;">rec_env</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">strict_arg_tys</span></span>
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1303
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<pre style="margin: 0;">+<span id="LC1303" class="line" lang="haskell"><span class="n" style="color: #333;">tysAreNonVoid</span> <span class="n" style="color: #333;">rec_env</span> <span class="n" style="color: #333;">strict_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SC</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1304
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<pre style="margin: 0;">+<span id="LC1304" class="line" lang="haskell"> <span class="n" style="color: #333;">all_non_void</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkAllNonVoid</span> <span class="n" style="color: #333;">rec_env</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">strict_arg_tys</span></span>
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1288
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1305
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<pre style="margin: 0;"> <span id="LC1305" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check if each strict argument type is inhabitable</span></span>
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1289
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1306
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<pre style="margin: 0;"> <span id="LC1306" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">all_non_void</span></span>
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1290
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<pre style="margin: 0;">-<span id="LC1290" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span></span>
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1307
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<pre style="margin: 0;">+<span id="LC1307" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span></span>
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1291
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1308
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<pre style="margin: 0;"> <span id="LC1308" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1292
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1309
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<pre style="margin: 0;"> <span id="LC1309" class="line" lang="haskell"></span>
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1293
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1310
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<pre style="margin: 0;"> <span id="LC1310" class="line" lang="haskell"><span class="cd">-- | Implements two performance optimizations, as described in</span></span>
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1294
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1311
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<pre style="margin: 0;"> <span id="LC1311" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @Note [Strict argument type constraints]@.</span></span>
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1295
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<pre style="margin: 0;">-<span id="LC1295" class="line" lang="haskell"><span class="n" style="color: #333;">checkAllNonVoid</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1312
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<pre style="margin: 0;">+<span id="LC1312" class="line" lang="haskell"><span class="n" style="color: #333;">checkAllNonVoid</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1296
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1313
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<pre style="margin: 0;"> <span id="LC1313" class="line" lang="haskell"><span class="n" style="color: #333;">checkAllNonVoid</span> <span class="n" style="color: #333;">rec_ts</span> <span class="n" style="color: #333;">amb_cs</span> <span class="n" style="color: #333;">strict_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1297
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<pre style="margin: 0;">-<span id="LC1297" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">definitely_inhabited</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">definitelyInhabitedType</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">delt</span>a_ty_st</span> <span class="n" style="color: #333;">amb_cs</span><span class="p">)</span></span>
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1314
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<pre style="margin: 0;">+<span id="LC1314" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">definitely_inhabited</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">definitelyInhabitedType</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a_ty_st</span> <span class="n" style="color: #333;">amb_cs</span><span class="p">)</span></span>
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1298
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1315
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<pre style="margin: 0;"> <span id="LC1315" class="line" lang="haskell"> <span class="n" style="color: #333;">tys_to_check</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">filterOutM</span> <span class="n" style="color: #333;">definitely_inhabited</span> <span class="n" style="color: #333;">strict_arg_tys</span></span>
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1299
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<td class="diff-line-num new_line" data-linenumber="1316" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1316
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<pre style="margin: 0;"> <span id="LC1316" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Fuel for the inhabitation test]</span></span>
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1300
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<td class="diff-line-num new_line" data-linenumber="1317" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1317
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<pre style="margin: 0;"> <span id="LC1317" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rec_max_bound</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tys_to_check</span> <span class="p">`</span><span class="n" style="color: #333;">lengthExceeds</span><span class="p">`</span> <span class="mi" style="color: #099;">1</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1309" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1326" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1309,7 +1326,7 @@ checkAllNonVoid rec_ts amb_cs strict_arg_tys = do</td>
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1309
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1326
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<pre style="margin: 0;"> <span id="LC1326" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [Strict argument type constraints]@.</span></span>
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1310
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<td class="diff-line-num new_line" data-linenumber="1327" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1327
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<pre style="margin: 0;"> <span id="LC1327" class="line" lang="haskell"><span class="n" style="color: #333;">nonVoid</span></span>
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1311
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<td class="diff-line-num new_line" data-linenumber="1328" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1328
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<pre style="margin: 0;"> <span id="LC1328" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The per-'TyCon' recursion depth limit.</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1312" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1312
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<td class="diff-line-num new_line old" data-linenumber="1329" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1312" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The ambient term/type constraints (known to be</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1313" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1329" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1329
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<pre style="margin: 0;">+<span id="LC1329" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The ambient term/type constraints (known to be</span></span>
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<td class="diff-line-num old_line" data-linenumber="1313" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1313
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<td class="diff-line-num new_line" data-linenumber="1330" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1330
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<pre style="margin: 0;"> <span id="LC1330" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- satisfiable).</span></span>
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1314
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<td class="diff-line-num new_line" data-linenumber="1331" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1331
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<pre style="margin: 0;"> <span id="LC1331" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The strict argument type.</span></span>
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1315
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1332
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<pre style="margin: 0;"> <span id="LC1332" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ 'True' if the strict argument type might be inhabited by</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1337" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1354" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1337,7 +1354,7 @@ nonVoid rec_ts amb_cs strict_arg_ty = do</td>
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1337
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1354
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<pre style="margin: 0;"> <span id="LC1354" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- check if recursion is detected).</span></span>
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1338
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1355
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<pre style="margin: 0;"> <span id="LC1355" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="diff-line-num old_line" data-linenumber="1339" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1339
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1356
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<pre style="margin: 0;"> <span id="LC1356" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Strict argument type constraints]</span></span>
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1340
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<pre style="margin: 0;">-<span id="LC1340" class="line" lang="haskell"> <span class="n" style="color: #333;">cand_is_inhabitable</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span></span>
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1357
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<pre style="margin: 0;">+<span id="LC1357" class="line" lang="haskell"> <span class="n" style="color: #333;">cand_is_inhabitable</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span></span>
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1341
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1358
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<pre style="margin: 0;"> <span id="LC1358" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InhabitationCandidate</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1342
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1359
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<pre style="margin: 0;"> <span id="LC1359" class="line" lang="haskell"> <span class="n" style="color: #333;">cand_is_inhabitable</span> <span class="n" style="color: #333;">rec_ts</span> <span class="n" style="color: #333;">amb_cs</span></span>
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1343
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1360
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<pre style="margin: 0;"> <span id="LC1360" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InhabitationCandidate</span><span class="p">{</span> <span class="n" style="color: #333;">ic_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_cs</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1516" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1533" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1516,21 +1533,21 @@ on a list of strict argument types, we filter out all of the DI ones.</td>
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1516
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1533
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<pre style="margin: 0;"> <span id="LC1533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1517
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1534
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<pre style="margin: 0;"> <span id="LC1534" class="line" lang="haskell"></span>
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1535
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<pre style="margin: 0;"> <span id="LC1535" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------------------------------------</span></span>
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1519
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<pre style="margin: 0;">-<span id="LC1519" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Providing positive evidence for a <span class="idiff left right">Delt</span>a</span></span>
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1536
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<pre style="margin: 0;">+<span id="LC1536" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Providing positive evidence for a <span class="idiff left right">Nabl</span>a</span></span>
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1520
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1537
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<pre style="margin: 0;"> <span id="LC1537" class="line" lang="haskell"></span>
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1521
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<pre style="margin: 0;">-<span id="LC1521" class="line" lang="haskell"><span class="cd">-- | @provideEvidence vs n <span class="idiff left right">delt</span>a@ returns a list of</span></span>
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1522
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<pre style="margin: 0;">-<span id="LC1522" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- at most @n@ (but perhaps empty) refinements of @<span class="idiff left right">delt</span>a@ that instantiate</span></span>
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1538
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<pre style="margin: 0;">+<span id="LC1538" class="line" lang="haskell"><span class="cd">-- | @provideEvidence vs n <span class="idiff left right">nabl</span>a@ returns a list of</span></span>
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1539
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<pre style="margin: 0;">+<span id="LC1539" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- at most @n@ (but perhaps empty) refinements of @<span class="idiff left right">nabl</span>a@ that instantiate</span></span>
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1523
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1540
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<pre style="margin: 0;"> <span id="LC1540" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @vs@ to compatible constructor applications or wildcards.</span></span>
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1524
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1541
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<pre style="margin: 0;"> <span id="LC1541" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Negative information is only retained if literals are involved or when</span></span>
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1525
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1542
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<pre style="margin: 0;"> <span id="LC1542" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for recursive GADTs.</span></span>
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1526
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<pre style="margin: 0;">-<span id="LC1526" class="line" lang="haskell"><span class="n" style="color: #333;">provideEvidence</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span><span class="p">]</span></span>
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1543
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<pre style="margin: 0;">+<span id="LC1543" class="line" lang="haskell"><span class="n" style="color: #333;">provideEvidence</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span><span class="p">]</span></span>
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1527
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1544
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<pre style="margin: 0;"> <span id="LC1544" class="line" lang="haskell"><span class="n" style="color: #333;">provideEvidence</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span></span>
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1528
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1545
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<pre style="margin: 0;"> <span id="LC1545" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1529
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1546
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<pre style="margin: 0;"> <span id="LC1546" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="mi" style="color: #099;">0</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1530
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<pre style="margin: 0;">-<span id="LC1530" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pure</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span><span class="p">]</span></span>
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1531
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<pre style="margin: 0;">-<span id="LC1531" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1532
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<pre style="margin: 0;">-<span id="LC1532" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"provideEvidence"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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1533
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<pre style="margin: 0;">-<span id="LC1533" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">VI</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">neg</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">initLookupVarInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delta</span></span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC1547" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pure</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span><span class="p">]</span></span>
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1548
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<pre style="margin: 0;">+<span id="LC1548" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1549
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<pre style="margin: 0;">+<span id="LC1549" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"provideEvidence"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1550" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left">let</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">VI</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">neg</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lookupVarInfo</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">nabla_tm_st</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nabla</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">x</span></span>
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1534
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1551
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<pre style="margin: 0;"> <span id="LC1551" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">pos</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1535
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1552
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<pre style="margin: 0;"> <span id="LC1552" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1536
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1553
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<pre style="margin: 0;"> <span id="LC1553" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- All solutions must be valid at once. Try to find candidates for their</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1543" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1543,56 +1560,57 @@ provideEvidence = go</td>
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1560
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<pre style="margin: 0;"> <span id="LC1560" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- some @y@ and @SomePatSyn z@ for some @z@. We must find evidence for @y@</span></span>
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1561
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<pre style="margin: 0;"> <span id="LC1561" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and @z@ that is valid at the same time. These constitute arg_vas below.</span></span>
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1562
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<pre style="margin: 0;"> <span id="LC1562" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">arg_vas</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">concatMap</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">_cl</span><span class="p">,</span> <span class="n" style="color: #333;">_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="n" style="color: #333;">pos</span></span>
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1546
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<pre style="margin: 0;">-<span id="LC1546" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">arg_vas</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span></span>
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1563
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<pre style="margin: 0;">+<span id="LC1563" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">arg_vas</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span></span>
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1547
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1564
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<pre style="margin: 0;"> <span id="LC1564" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1548
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1565
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<pre style="margin: 0;"> <span id="LC1565" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- When there are literals involved, just print negative info</span></span>
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1566
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<pre style="margin: 0;"> <span id="LC1566" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- instead of listing missed constructors</span></span>
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1550
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1567
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<pre style="margin: 0;"> <span id="LC1567" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">notNull</span> <span class="p">[</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pmAltConSetElems</span> <span class="n" style="color: #333;">neg</span> <span class="p">]</span></span>
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1551
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<pre style="margin: 0;">-<span id="LC1551" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span></span>
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1552
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<pre style="margin: 0;">-<span id="LC1552" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">try_instantiate</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span></span>
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1568
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<pre style="margin: 0;">+<span id="LC1568" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span></span>
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1569
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<pre style="margin: 0;">+<span id="LC1569" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">try_instantiate</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span></span>
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1553
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1570
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<pre style="margin: 0;"> <span id="LC1570" class="line" lang="haskell"></span>
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1554
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1571
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<pre style="margin: 0;"> <span id="LC1571" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Tries to instantiate a variable by possibly following the chain of</span></span>
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1555
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1572
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<pre style="margin: 0;"> <span id="LC1572" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- newtypes and then instantiating to all ConLikes of the wrapped type's</span></span>
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1556
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1573
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<pre style="margin: 0;"> <span id="LC1573" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- minimal residual COMPLETE set.</span></span>
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1557
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<pre style="margin: 0;">-<span id="LC1557" class="line" lang="haskell"> <span class="n" style="color: #333;">try_instantiate</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span><span class="p">]</span></span>
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1574
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<pre style="margin: 0;">+<span id="LC1574" class="line" lang="haskell"> <span class="n" style="color: #333;">try_instantiate</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span><span class="p">]</span></span>
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1558
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1575
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<pre style="margin: 0;"> <span id="LC1575" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Convention: x binds the outer constructor in the chain, y the inner one.</span></span>
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1559
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<pre style="margin: 0;">-<span id="LC1559" class="line" lang="haskell"> <span class="n" style="color: #333;">try_instantiate</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1560
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<pre style="margin: 0;">-<span id="LC1560" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">_src_ty</span><span class="p">,</span> <span class="n" style="color: #333;">dcs</span><span class="p">,</span> <span class="n" style="color: #333;">core_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tntrGuts</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">pmTopNormaliseType</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">delta_ty_st</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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1561
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<pre style="margin: 0;">-<span id="LC1561" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">build_newtype</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">_ty</span><span class="p">,</span> <span class="n" style="color: #333;">dc</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1576
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<pre style="margin: 0;">+<span id="LC1576" class="line" lang="haskell"> <span class="n" style="color: #333;">try_instantiate</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1577
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<pre style="margin: 0;">+<span id="LC1577" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">_src_ty</span><span class="p">,</span> <span class="n" style="color: #333;">dcs</span><span class="p">,</span> <span class="n" style="color: #333;">core_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tntrGuts</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">pmTopNormaliseType</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">nabla_ty_st</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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1578
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<pre style="margin: 0;">+<span id="LC1578" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">build_newtype</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">_ty</span><span class="p">,</span> <span class="n" style="color: #333;">dc</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1562
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1579
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<pre style="margin: 0;"> <span id="LC1579" class="line" lang="haskell"> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkPmId</span> <span class="n" style="color: #333;">arg_ty</span></span>
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1563
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1580
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<pre style="margin: 0;"> <span id="LC1580" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Newtypes don't have existentials (yet?!), so passing an empty</span></span>
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1564
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1581
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<pre style="margin: 0;"> <span id="LC1581" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- list as ex_tvs.</span></span>
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1565
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<pre style="margin: 0;">-<span id="LC1565" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">delta'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">))</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">[</span><span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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1566
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<pre style="margin: 0;">-<span id="LC1566" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a'</span><span class="p">)</span></span>
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1567
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<td class="diff-line-num new_line old" data-linenumber="1582" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1567" class="line" lang="haskell"> <span class="n" style="color: #333;">runMaybeT</span> <span class="p">(</span><span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">build_newtype</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span><span class="p">)</span> <span class="n" style="color: #333;">dcs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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1582
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<pre style="margin: 0;">+<span id="LC1582" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">nabla'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">))</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">[</span><span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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1583
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<pre style="margin: 0;">+<span id="LC1583" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a'</span><span class="p">)</span></span>
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1584
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<pre style="margin: 0;">+<span id="LC1584" class="line" lang="haskell"> <span class="n" style="color: #333;">runMaybeT</span> <span class="p">(</span><span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">build_newtype</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span><span class="p">)</span> <span class="n" style="color: #333;">dcs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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1568
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1585
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<pre style="margin: 0;"> <span id="LC1585" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1569
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<td class="diff-line-num new_line old" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1569" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">newty_<span class="idiff left right">delt</span>a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1586
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<pre style="margin: 0;">+<span id="LC1586" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">newty_<span class="idiff left right">nabl</span>a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1570
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1587
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<pre style="margin: 0;"> <span id="LC1587" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Pick a COMPLETE set and instantiate it (n at max). Take care of ⊥.</span></span>
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1571
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<pre style="margin: 0;">-<span id="LC1571" class="line" lang="haskell"> <span class="n" style="color: #333;">pm</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">vi_cache</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">initLookupVarInfo</span> <span class="n" style="color: #333;">newty_delta</span> <span class="n" style="color: #333;">y</span></span>
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1572
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<pre style="margin: 0;">-<span id="LC1572" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_cls</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pickMinimalCompleteSet</span> <span class="n" style="color: #333;">newty_delta</span> <span class="n" style="color: #333;">pm</span></span>
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1588
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<pre style="margin: 0;">+<span id="LC1588" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupVarInfo</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_tm_st</span> <span class="n" style="color: #333;">newty_nabla</span><span class="p">)</span> <span class="n" style="color: #333;">y</span></span>
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1589
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<pre style="margin: 0;">+<span id="LC1589" class="line" lang="haskell"> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">initPossibleMatches</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_ty_st</span> <span class="n" style="color: #333;">newty_nabla</span><span class="p">)</span> <span class="n" style="color: #333;">vi</span></span>
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1590
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<pre style="margin: 0;">+<span id="LC1590" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_cls</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pickMinimalCompleteSet</span> <span class="n" style="color: #333;">newty_nabla</span> <span class="p">(</span><span class="n" style="color: #333;">vi_cache</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span></span>
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1573
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1591
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<pre style="margin: 0;"> <span id="LC1591" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">uniqDSetToList</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mb_cls</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1574
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<td class="diff-line-num new_line old" data-linenumber="1592" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1574" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cls</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">instantiate_cons</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">core_ty</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">newty_<span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">cls</span></span>
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1575
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<pre style="margin: 0;">-<span id="LC1575" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">not</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">canDiverge</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">newty_delta</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">y</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1592
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<pre style="margin: 0;">+<span id="LC1592" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cls</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">instantiate_cons</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">core_ty</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">newty_<span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">cls</span></span>
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1593
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<pre style="margin: 0;">+<span id="LC1593" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">vi_bot</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vi</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">==</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">IsNotBot</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1576
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1594
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<pre style="margin: 0;"> <span id="LC1594" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Either ⊥ is still possible (think Void) or there are no COMPLETE</span></span>
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1577
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1595
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<pre style="margin: 0;"> <span id="LC1595" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sets available, so we can assume it's inhabited</span></span>
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1578
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<pre style="margin: 0;">-<span id="LC1578" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">newty_<span class="idiff left right">delt</span>a</span></span>
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1596
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<pre style="margin: 0;">+<span id="LC1596" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">newty_<span class="idiff left right">nabl</span>a</span></span>
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1579
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1597
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<pre style="margin: 0;"> <span id="LC1597" class="line" lang="haskell"></span>
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1580
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<pre style="margin: 0;">-<span id="LC1580" class="line" lang="haskell"> <span class="n" style="color: #333;">instantiate_cons</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ConLike</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span><span class="p">]</span></span>
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1598
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<pre style="margin: 0;">+<span id="LC1598" class="line" lang="haskell"> <span class="n" style="color: #333;">instantiate_cons</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ConLike</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span><span class="p">]</span></span>
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1581
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1599
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<pre style="margin: 0;"> <span id="LC1599" class="line" lang="haskell"> <span class="n" style="color: #333;">instantiate_cons</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1582
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1600
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<pre style="margin: 0;"> <span id="LC1600" class="line" lang="haskell"> <span class="n" style="color: #333;">instantiate_cons</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="mi" style="color: #099;">0</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1583
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<pre style="margin: 0;">-<span id="LC1583" class="line" lang="haskell"> <span class="n" style="color: #333;">instantiate_cons</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="kr" style="font-weight: 600;">_</span></span>
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1601
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<pre style="margin: 0;">+<span id="LC1601" class="line" lang="haskell"> <span class="n" style="color: #333;">instantiate_cons</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="kr" style="font-weight: 600;">_</span></span>
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1584
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1602
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<pre style="margin: 0;"> <span id="LC1602" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't want to expose users to GHC-specific constructors for Int etc.</span></span>
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1585
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1603
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<pre style="margin: 0;"> <span id="LC1603" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">fmap</span> <span class="p">(</span><span class="n" style="color: #333;">isTyConTriviallyInhabited</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fst</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">splitTyConApp_maybe</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1586
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<pre style="margin: 0;">-<span id="LC1586" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span></span>
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1587
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<td class="diff-line-num new_line old" data-linenumber="1604" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1587" class="line" lang="haskell"> <span class="n" style="color: #333;">instantiate_cons</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="p">(</span><span class="n" style="color: #333;">cl</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">cls</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1604
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<pre style="margin: 0;">+<span id="LC1604" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1605" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1605
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<pre style="margin: 0;">+<span id="LC1605" class="line" lang="haskell"> <span class="n" style="color: #333;">instantiate_cons</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="p">(</span><span class="n" style="color: #333;">cl</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">cls</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1588
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<td class="diff-line-num new_line" data-linenumber="1606" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1606
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<pre style="margin: 0;"> <span id="LC1606" class="line" lang="haskell"> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGetFamInstEnvs</span></span>
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<td class="diff-line-num old_line" data-linenumber="1589" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1589
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<td class="diff-line-num new_line" data-linenumber="1607" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1607
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<pre style="margin: 0;"> <span id="LC1607" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">guessConLikeUnivTyArgsFromResTy</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">cl</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1590" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1590
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<td class="diff-line-num new_line old" data-linenumber="1608" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1590" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">[</span><span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- No idea how to refine this one, so just finish off with a wildcard</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1591" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1608" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1608
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<pre style="margin: 0;">+<span id="LC1608" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">[</span><span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- No idea how to refine this one, so just finish off with a wildcard</span></span>
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1591
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<td class="diff-line-num new_line" data-linenumber="1609" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1609
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<pre style="margin: 0;"> <span id="LC1609" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="diff-line-num old_line" data-linenumber="1592" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1592
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<td class="diff-line-num new_line" data-linenumber="1610" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1610
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<pre style="margin: 0;"> <span id="LC1610" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">arg_vars</span><span class="p">,</span> <span class="n" style="color: #333;">new_ty_cs</span><span class="p">,</span> <span class="n" style="color: #333;">strict_arg_tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkOneConFull</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">cl</span></span>
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<td class="diff-line-num old_line" data-linenumber="1593" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1593
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<td class="diff-line-num new_line" data-linenumber="1611" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1611
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<pre style="margin: 0;"> <span id="LC1611" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">new_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitBag</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TmConCt</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl</span><span class="p">)</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">arg_vars</span><span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="1594" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1594
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<td class="diff-line-num new_line" data-linenumber="1612" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1612
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<pre style="margin: 0;"> <span id="LC1612" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now check satifiability</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1595" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1595
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<td class="diff-line-num new_line old" data-linenumber="1613" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1595" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_<span class="idiff left">delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pmIsSatisfiable</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">new_ty_cs</span> <span class="n" style="color: #333;">new_tm_cs</span> <span class="n" style="color: #333;">strict_arg_tys</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1596" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1613" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1613
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<pre style="margin: 0;">+<span id="LC1613" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_<span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pmIsSatisfiable</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">new_ty_cs</span> <span class="n" style="color: #333;">new_tm_cs</span> <span class="n" style="color: #333;">strict_arg_tys</span></span>
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1596
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<td class="diff-line-num new_line" data-linenumber="1614" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1614
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<pre style="margin: 0;"> <span id="LC1614" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"instantiate_cons"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span></span>
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<td class="diff-line-num old_line" data-linenumber="1597" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1597
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<td class="diff-line-num new_line" data-linenumber="1615" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1615
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<pre style="margin: 0;"> <span id="LC1615" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="1598" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1598
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<td class="diff-line-num new_line" data-linenumber="1616" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1616
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<pre style="margin: 0;"> <span id="LC1616" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1601" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1619" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1601,21 +1619,21 @@ provideEvidence = go</td>
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1601
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1619
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<pre style="margin: 0;"> <span id="LC1619" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">new_tm_cs</span></span>
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1602
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<td class="diff-line-num new_line" data-linenumber="1620" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1620
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<pre style="margin: 0;"> <span id="LC1620" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">new_ty_cs</span></span>
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1603
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1621
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<pre style="margin: 0;"> <span id="LC1621" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">strict_arg_tys</span></span>
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1604
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<pre style="margin: 0;">-<span id="LC1604" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span></span>
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1605
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<pre style="margin: 0;">-<span id="LC1605" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">mb_<span class="idiff left right">delt</span>a</span></span>
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1622
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<pre style="margin: 0;">+<span id="LC1622" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span></span>
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1623
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<pre style="margin: 0;">+<span id="LC1623" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">mb_<span class="idiff left right">nabl</span>a</span></span>
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1606
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1624
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<pre style="margin: 0;"> <span id="LC1624" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span> <span class="p">])</span></span>
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1607
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<pre style="margin: 0;">-<span id="LC1607" class="line" lang="haskell"> <span class="n" style="color: #333;">con_<span class="idiff left">deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">case</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">mb_delt</span>a</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1625
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<pre style="margin: 0;">+<span id="LC1625" class="line" lang="haskell"> <span class="n" style="color: #333;">con_<span class="idiff left">nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">case</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">mb_nabl</span>a</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1608
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1626
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<pre style="margin: 0;"> <span id="LC1626" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1609
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1627
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<pre style="margin: 0;"> <span id="LC1627" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: We don't prepend arg_vars as we don't have any evidence on</span></span>
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1610
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1628
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<pre style="margin: 0;"> <span id="LC1628" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- them and we only want to split once on a data type. They are</span></span>
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1611
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1629
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<pre style="margin: 0;"> <span id="LC1629" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inhabited, otherwise pmIsSatisfiable would have refuted.</span></span>
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1612
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<pre style="margin: 0;">-<span id="LC1612" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;"><span class="idiff left">delta'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">xs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a'</span></span>
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1613
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<pre style="margin: 0;">-<span id="LC1613" class="line" lang="haskell"> <span class="n" style="color: #333;">other_cons_<span class="idiff left">deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instantiate_cons</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">xs</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">length</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">con_deltas</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">cls</span></span>
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1614
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<pre style="margin: 0;">-<span id="LC1614" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">con_<span class="idiff left">deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">++</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">other_cons_delt</span>as</span><span class="p">)</span></span>
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1630
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<pre style="margin: 0;">+<span id="LC1630" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;"><span class="idiff left">nabla'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">xs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a'</span></span>
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1631
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<pre style="margin: 0;">+<span id="LC1631" class="line" lang="haskell"> <span class="n" style="color: #333;">other_cons_<span class="idiff left">nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instantiate_cons</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">xs</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">length</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">con_nablas</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">cls</span></span>
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1632
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<pre style="margin: 0;">+<span id="LC1632" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">con_<span class="idiff left">nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">++</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">other_cons_nabl</span>as</span><span class="p">)</span></span>
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1615
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1633
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<pre style="margin: 0;"> <span id="LC1633" class="line" lang="haskell"></span>
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1616
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<pre style="margin: 0;">-<span id="LC1616" class="line" lang="haskell"><span class="n" style="color: #333;">pickMinimalCompleteSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PossibleMatches</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">ConLikeSet</span><span class="p">)</span></span>
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1634
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<pre style="margin: 0;">+<span id="LC1634" class="line" lang="haskell"><span class="n" style="color: #333;">pickMinimalCompleteSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PossibleMatches</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">ConLikeSet</span><span class="p">)</span></span>
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1617
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1635
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<pre style="margin: 0;"> <span id="LC1635" class="line" lang="haskell"><span class="n" style="color: #333;">pickMinimalCompleteSet</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">NoPM</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1618
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<pre style="margin: 0;">-<span id="LC1618" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TODO: First prune sets with type info in <span class="idiff left right">delt</span>a. But this is good enough for</span></span>
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1636
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<pre style="margin: 0;">+<span id="LC1636" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TODO: First prune sets with type info in <span class="idiff left right">nabl</span>a. But this is good enough for</span></span>
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1619
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1637
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<pre style="margin: 0;"> <span id="LC1637" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- now and less costly. See #17386.</span></span>
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1620
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1638
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<pre style="margin: 0;"> <span id="LC1638" class="line" lang="haskell"><span class="n" style="color: #333;">pickMinimalCompleteSet</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PM</span> <span class="n" style="color: #333;">clss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1621
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1639
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<pre style="margin: 0;"> <span id="LC1639" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"pickMinimalCompleteSet"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">toList</span> <span class="n" style="color: #333;">clss</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1625,14 +1643,14 @@ pickMinimalCompleteSet _ (PM clss) = do</td>
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1625
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1643
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<pre style="margin: 0;"> <span id="LC1643" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Which is the @x@ of a @let x = e'@ constraint (with @e@ semantically</span></span>
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1626
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1644
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<pre style="margin: 0;"> <span id="LC1644" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- equivalent to @e'@) we encountered earlier, or a fresh identifier if</span></span>
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1627
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1645
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<pre style="margin: 0;"> <span id="LC1645" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- there weren't any such constraints.</span></span>
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<pre style="margin: 0;">-<span id="LC1628" class="line" lang="haskell"><span class="n" style="color: #333;">representCoreExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CoreExpr</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1629" class="line" lang="haskell"><span class="n" style="color: #333;">representCoreExpr</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkDelta</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span> <span class="n" style="color: #333;">ts_reps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">e</span></span>
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1630
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<pre style="margin: 0;">-<span id="LC1630" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupCoreMap</span> <span class="n" style="color: #333;">reps</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span><span class="p">,</span> <span class="n" style="color: #333;">rep</span><span class="p">)</span></span>
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1646
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<pre style="margin: 0;">+<span id="LC1646" class="line" lang="haskell"><span class="n" style="color: #333;">representCoreExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CoreExpr</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1647" class="line" lang="haskell"><span class="n" style="color: #333;">representCoreExpr</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkNabla</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span> <span class="n" style="color: #333;">ts_reps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC1648" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupCoreMap</span> <span class="n" style="color: #333;">reps</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span><span class="p">,</span> <span class="n" style="color: #333;">rep</span><span class="p">)</span></span>
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1631
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1649
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<pre style="margin: 0;"> <span id="LC1649" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1632
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1650
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<pre style="margin: 0;"> <span id="LC1650" class="line" lang="haskell"> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkPmId</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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1633
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1651
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<pre style="margin: 0;"> <span id="LC1651" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">reps'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendCoreMap</span> <span class="n" style="color: #333;">reps</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">rep</span></span>
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1634
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<pre style="margin: 0;">-<span id="LC1634" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;"><span class="idiff left">delta'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">delta</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span> <span class="n" style="color: #333;">ts_reps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reps'</span> <span class="p">}</span> <span class="p">}</span></span>
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1635
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<pre style="margin: 0;">-<span id="LC1635" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">delt</span>a'</span><span class="p">,</span> <span class="n" style="color: #333;">rep</span><span class="p">)</span></span>
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1652
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<pre style="margin: 0;">+<span id="LC1652" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;"><span class="idiff left">nabla'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nabla</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span> <span class="n" style="color: #333;">ts_reps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reps'</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1653" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a'</span><span class="p">,</span> <span class="n" style="color: #333;">rep</span><span class="p">)</span></span>
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1636
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1654
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<pre style="margin: 0;"> <span id="LC1654" class="line" lang="haskell"></span>
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1637
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1655
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<pre style="margin: 0;"> <span id="LC1655" class="line" lang="haskell"><span class="cd">-- | Inspects a 'PmCoreCt' @let x = e@ by recording constraints for @x@ based</span></span>
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1638
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1656
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<pre style="margin: 0;"> <span id="LC1656" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- on the shape of the 'CoreExpr' @e@. Examples:</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1646" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1646,16 +1664,16 @@ representCoreExpr delta@MkDelta{ delta_tm_st = ts@TmSt{ ts_reps = reps } } e</td>
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1646
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1664
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<pre style="margin: 0;"> <span id="LC1664" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for other literals. See 'coreExprAsPmLit'.</span></span>
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1665
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<pre style="margin: 0;"> <span id="LC1665" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Finally, if we have @let x = e@ and we already have seen @let y = e@, we</span></span>
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1666
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<pre style="margin: 0;"> <span id="LC1666" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- want to record @x ~ y@.</span></span>
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1649
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<pre style="margin: 0;">-<span id="LC1649" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CoreExpr</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeT</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span></span>
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<pre style="margin: 0;">-<span id="LC1650" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreCt</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC1667" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CoreExpr</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeT</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span></span>
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<pre style="margin: 0;">+<span id="LC1668" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreCt</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1651
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1669
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<pre style="margin: 0;"> <span id="LC1669" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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1652
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1670
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<pre style="margin: 0;"> <span id="LC1670" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">e'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simpleOptExpr</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">e</span></span>
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1653
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<pre style="margin: 0;">-<span id="LC1653" class="line" lang="haskell"> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"addCoreCt"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e'</span><span class="p">)</span></span>
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1654
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<pre style="margin: 0;">-<span id="LC1654" class="line" lang="haskell"> <span class="n" style="color: #333;">execStateT</span> <span class="p">(</span><span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e'</span><span class="p">)</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span></span>
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1671
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<pre style="margin: 0;">+<span id="LC1671" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- </span>lift $ tracePm "addCoreCt" (ppr x <+> dcolon <+> ppr (idType x) $$ ppr e $$ ppr e')</span></span>
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1672
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<pre style="margin: 0;">+<span id="LC1672" class="line" lang="haskell"> <span class="n" style="color: #333;">execStateT</span> <span class="p">(</span><span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e'</span><span class="p">)</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span></span>
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1655
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1673
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<pre style="margin: 0;"> <span id="LC1673" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1656
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1674
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<pre style="margin: 0;"> <span id="LC1674" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Takes apart a 'CoreExpr' and tries to extract as much information about</span></span>
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1657
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1675
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<pre style="margin: 0;"> <span id="LC1675" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- literals and constructor applications as possible.</span></span>
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1658
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<pre style="margin: 0;">-<span id="LC1658" class="line" lang="haskell"> <span class="n" style="color: #333;">core_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1676
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<pre style="margin: 0;">+<span id="LC1676" class="line" lang="haskell"> <span class="n" style="color: #333;">core_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1659
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1677
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<pre style="margin: 0;"> <span id="LC1677" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: Handle newtypes properly, by wrapping the expression in a DataCon</span></span>
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1660
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1678
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<pre style="margin: 0;"> <span id="LC1678" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is the right thing for casts involving data family instances and</span></span>
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1661
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1679
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<pre style="margin: 0;"> <span id="LC1679" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- their representation TyCon, though (which are not visible in source</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1680" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1698" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1680,7 +1698,7 @@ addCoreCt delta x e = do</td>
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1680
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1698
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<pre style="margin: 0;"> <span id="LC1698" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Detecting pattern synonym applications in expressions]</span></span>
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1681
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1699
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<pre style="margin: 0;"> <span id="LC1699" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">e</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isDataConId_maybe</span> <span class="n" style="color: #333;">x</span></span>
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1682
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1700
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<pre style="margin: 0;"> <span id="LC1700" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't consider DataCons flexible variables</span></span>
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1683
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<pre style="margin: 0;">-<span id="LC1683" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">modifyT</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addVarCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1701" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">modifyT</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addVarCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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1684
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1702
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<pre style="margin: 0;"> <span id="LC1702" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC1703" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Any other expression. Try to find other uses of a semantically</span></span>
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1704
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<pre style="margin: 0;"> <span id="LC1704" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- equivalent expression and represent them by the same variable!</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1698,13 +1716,13 @@ addCoreCt delta x e = do</td>
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1698
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1716
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<pre style="margin: 0;"> <span id="LC1716" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- see if we already encountered a constraint @let y = e'@ with @e'@</span></span>
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1699
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1717
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<pre style="margin: 0;"> <span id="LC1717" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- semantically equivalent to @e@, in which case we may add the constraint</span></span>
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1700
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1718
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<pre style="margin: 0;"> <span id="LC1718" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @x ~ y@.</span></span>
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1701
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<pre style="margin: 0;">-<span id="LC1701" class="line" lang="haskell"> <span class="n" style="color: #333;">equate_with_similar_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC1719" class="line" lang="haskell"> <span class="n" style="color: #333;">equate_with_similar_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC1720" class="line" lang="haskell"> <span class="n" style="color: #333;">equate_with_similar_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1703
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<pre style="margin: 0;">-<span id="LC1703" class="line" lang="haskell"> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">swap</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><$></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lift</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">representCoreExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1721" class="line" lang="haskell"> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">swap</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><$></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lift</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">representCoreExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1722" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note that @rep == x@ if we encountered @e@ for the first time.</span></span>
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<pre style="margin: 0;">-<span id="LC1705" class="line" lang="haskell"> <span class="n" style="color: #333;">modifyT</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addVarCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">rep</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1723" class="line" lang="haskell"> <span class="n" style="color: #333;">modifyT</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addVarCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">rep</span><span class="p">)</span></span>
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1724
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<pre style="margin: 0;"> <span id="LC1724" class="line" lang="haskell"></span>
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1707
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<pre style="margin: 0;">-<span id="LC1707" class="line" lang="haskell"> <span class="n" style="color: #333;">bind_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span></span>
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<pre style="margin: 0;">+<span id="LC1725" class="line" lang="haskell"> <span class="n" style="color: #333;">bind_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span></span>
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1708
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1726
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<pre style="margin: 0;"> <span id="LC1726" class="line" lang="haskell"> <span class="n" style="color: #333;">bind_expr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1709
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1727
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<pre style="margin: 0;"> <span id="LC1727" class="line" lang="haskell"> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="p">(</span><span class="n" style="color: #333;">lift</span> <span class="p">(</span><span class="n" style="color: #333;">mkPmId</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">e</span><span class="p">)))</span></span>
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1710
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1728
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<pre style="margin: 0;"> <span id="LC1728" class="line" lang="haskell"> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1712,10 +1730,12 @@ addCoreCt delta x e = do</td>
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1712
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1730
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<pre style="margin: 0;"> <span id="LC1730" class="line" lang="haskell"></span>
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1713
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1731
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<pre style="margin: 0;"> <span id="LC1731" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Look at @let x = K taus theta es@ and generate the following</span></span>
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1714
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1732
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<pre style="margin: 0;"> <span id="LC1732" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constraints (assuming universals were dropped from @taus@ before):</span></span>
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1715
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<pre style="margin: 0;">-<span id="LC1715" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. @a_1 ~ tau_1, ..., a_n ~ tau_n@ for fresh @a_i@</span></span>
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1716
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<pre style="margin: 0;">-<span id="LC1716" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2. @y_1 ~ e_1, ..., y_m ~ e_m@ for fresh @y_i@</span></span>
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1717
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<pre style="margin: 0;">-<span id="LC1717" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 3. @x ~ K as ys@</span></span>
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1718
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<pre style="margin: 0;">-<span id="LC1718" class="line" lang="haskell"> <span class="n" style="color: #333;">data_con_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InScopeSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC1733" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. @x /~ ⊥@ if 'K' is not a Newtype constructor.</span></span>
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<pre style="margin: 0;">+<span id="LC1734" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2. @a_1 ~ tau_1, ..., a_n ~ tau_n@ for fresh @a_i@</span></span>
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1735
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<pre style="margin: 0;">+<span id="LC1735" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 3. @y_1 ~ e_1, ..., y_m ~ e_m@ for fresh @y_i@</span></span>
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1736
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<pre style="margin: 0;">+<span id="LC1736" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 4. @x ~ K as ys@</span></span>
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1737
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<pre style="margin: 0;">+<span id="LC1737" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is quite similar to PmCheck.pmConCts.</span></span>
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1738
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<pre style="margin: 0;">+<span id="LC1738" class="line" lang="haskell"> <span class="n" style="color: #333;">data_con_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InScopeSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1719
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1739
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<pre style="margin: 0;"> <span id="LC1739" class="line" lang="haskell"> <span class="n" style="color: #333;">data_con_app</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">dc</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1720
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1740
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<pre style="margin: 0;"> <span id="LC1740" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">dc_ex_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConExTyCoVars</span> <span class="n" style="color: #333;">dc</span></span>
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1721
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1741
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<pre style="margin: 0;"> <span id="LC1741" class="line" lang="haskell"> <span class="n" style="color: #333;">arty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConSourceArity</span> <span class="n" style="color: #333;">dc</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1725,20 +1745,27 @@ addCoreCt delta x e = do</td>
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1725
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1745
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<pre style="margin: 0;"> <span id="LC1745" class="line" lang="haskell"> <span class="n" style="color: #333;">uniq_supply</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">getUniqueSupplyM</span></span>
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1726
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1746
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<pre style="margin: 0;"> <span id="LC1746" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">ex_tvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cloneTyVarBndrs</span> <span class="p">(</span><span class="n" style="color: #333;">mkEmptyTCvSubst</span> <span class="n" style="color: #333;">in_scope</span><span class="p">)</span> <span class="n" style="color: #333;">dc_ex_tvs</span> <span class="n" style="color: #333;">uniq_supply</span></span>
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1727
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1747
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<pre style="margin: 0;"> <span id="LC1747" class="line" lang="haskell"> <span class="n" style="color: #333;">ty_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">equateTys</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">ex_tvs</span><span class="p">)</span> <span class="n" style="color: #333;">ex_tys</span></span>
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1728
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<pre style="margin: 0;">-<span id="LC1728" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. @a_1 ~ tau_1, ..., a_n ~ tau_n@ for fresh @a_i@. See also #17703</span></span>
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1729
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<pre style="margin: 0;">-<span id="LC1729" class="line" lang="haskell"> <span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">addPmCts</span> <span class="n" style="color: #333;">delta</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">ty_cts</span><span class="p">)</span></span>
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1730
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<pre style="margin: 0;">-<span id="LC1730" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2. @y_1 ~ e_1, ..., y_m ~ e_m@ for fresh @y_i@</span></span>
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1748
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<pre style="margin: 0;">+<span id="LC1748" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. @x /~ ⊥@ if 'K' is not a Newtype constructor (#18341)</span></span>
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1749
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<pre style="margin: 0;">+<span id="LC1749" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isNewDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span></span>
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1750
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<pre style="margin: 0;">+<span id="LC1750" class="line" lang="haskell"> <span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addNotBotCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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1751
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<pre style="margin: 0;">+<span id="LC1751" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2. @a_1 ~ tau_1, ..., a_n ~ tau_n@ for fresh @a_i@. See also #17703</span></span>
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1752
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<pre style="margin: 0;">+<span id="LC1752" class="line" lang="haskell"> <span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">addPmCts</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">ty_cts</span><span class="p">)</span></span>
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1753
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<pre style="margin: 0;">+<span id="LC1753" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 3. @y_1 ~ e_1, ..., y_m ~ e_m@ for fresh @y_i@</span></span>
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1731
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1754
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<pre style="margin: 0;"> <span id="LC1754" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_ids</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">bind_expr</span> <span class="n" style="color: #333;">vis_args</span></span>
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1732
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<pre style="margin: 0;">-<span id="LC1732" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">3</span>. @x ~ K as ys@</span></span>
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1755
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<pre style="margin: 0;">+<span id="LC1755" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">4</span>. @x ~ K as ys@</span></span>
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1733
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1756
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<pre style="margin: 0;"> <span id="LC1756" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">))</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="n" style="color: #333;">arg_ids</span></span>
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1734
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1757
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<pre style="margin: 0;"> <span id="LC1757" class="line" lang="haskell"></span>
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1735
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1758
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<pre style="margin: 0;"> <span id="LC1758" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Adds a literal constraint, i.e. @x ~ 42@.</span></span>
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1736
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<pre style="margin: 0;">-<span id="LC1736" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_lit</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1737
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<pre style="margin: 0;">-<span id="LC1737" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_lit</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">lit</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1759
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<pre style="margin: 0;">+<span id="LC1759" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Also we assume that literal expressions won't diverge, so this</span></span>
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1760
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<pre style="margin: 0;">+<span id="LC1760" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- will add a @x ~/ ⊥@ constraint.</span></span>
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1761
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<pre style="margin: 0;">+<span id="LC1761" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_lit</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1762
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<pre style="margin: 0;">+<span id="LC1762" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_lit</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">lit</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1763
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<pre style="margin: 0;">+<span id="LC1763" class="line" lang="haskell"> <span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addNotBotCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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1764
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<pre style="margin: 0;">+<span id="LC1764" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1738
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1765
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<pre style="margin: 0;"> <span id="LC1765" class="line" lang="haskell"></span>
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1739
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1766
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<pre style="margin: 0;"> <span id="LC1766" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Adds the given constructor application as a solution for @x@.</span></span>
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1740
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<pre style="margin: 0;">-<span id="LC1740" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1741
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<pre style="margin: 0;">-<span id="LC1741" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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1767
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<pre style="margin: 0;">+<span id="LC1767" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1768
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<pre style="margin: 0;">+<span id="LC1768" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addConCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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1769
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<pre style="margin: 0;"> <span id="LC1769" class="line" lang="haskell"></span>
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1743
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1770
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<pre style="margin: 0;"> <span id="LC1770" class="line" lang="haskell"><span class="cd">-- | Like 'modify', but with an effectful modifier action</span></span>
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1744
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1771
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<pre style="margin: 0;"> <span id="LC1771" class="line" lang="haskell"><span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">m</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#16160f179df308e914fffee87ce52c9a048bde89"><strong>compiler/GHC/HsToCore/PmCheck/Ppr.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2,7 +2,7 @@</td>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wno-incomplete-uni-patterns #-}</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="haskell"><span class="cd">-- | Provides factilities for pretty-printing '<span class="idiff left right">Delt</span>a's in a way appropriate for</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cd">-- | Provides factilities for pretty-printing '<span class="idiff left right">Nabl</span>a's in a way appropriate for</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- user facing pattern match warnings.</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck.Ppr</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprUncovered</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -42,8 +42,8 @@ import GHC.HsToCore.PmCheck.Oracle</td>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When the set of refutable shapes contains more than 3 elements, the</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- additional elements are indicated by "...".</span></span>
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<pre style="margin: 0;">-<span id="LC45" class="line" lang="haskell"><span class="n" style="color: #333;">pprUncovered</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">-<span id="LC46" class="line" lang="haskell"><span class="n" style="color: #333;">pprUncovered</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">vas</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"><span class="n" style="color: #333;">pprUncovered</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"><span class="n" style="color: #333;">pprUncovered</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">vas</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNullUDFM</span> <span class="n" style="color: #333;">refuts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fsep</span> <span class="n" style="color: #333;">vec</span> <span class="c1" style="color: #998; font-style: italic;">-- there are no refutations</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">fsep</span> <span class="n" style="color: #333;">vec</span><span class="p">)</span> <span class="mi" style="color: #099;">4</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"where"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">vcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">pprRefutableShapes</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">snd</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">udfmToList</span> <span class="n" style="color: #333;">refuts</span><span class="p">))</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -54,8 +54,8 @@ pprUncovered delta vas</td>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">[</span><span class="kr" style="font-weight: 600;">_</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">vas</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">topPrec</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">appPrec</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_action</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">pprPmVar</span> <span class="n" style="color: #333;">init_prec</span><span class="p">)</span> <span class="n" style="color: #333;">vas</span></span>
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<pre style="margin: 0;">-<span id="LC57" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">vec</span><span class="p">,</span> <span class="n" style="color: #333;">renamings</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runPmPpr</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">ppr_action</span></span>
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<pre style="margin: 0;">-<span id="LC58" class="line" lang="haskell"> <span class="n" style="color: #333;">refuts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">prettifyRefuts</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">renamings</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">vec</span><span class="p">,</span> <span class="n" style="color: #333;">renamings</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runPmPpr</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">ppr_action</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"> <span class="n" style="color: #333;">refuts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">prettifyRefuts</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">renamings</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"><span class="cd">-- | Output refutable shapes of a variable in the form of @var is not one of {2,</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Nothing, 3}@. Will never print more than 3 refutable shapes, the tail is</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -98,21 +98,21 @@ substitution to the vectors before printing them out (see function `pprOne' in</td>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"><span class="cd">-- | Extract and assigns pretty names to constraint variables with refutable</span></span>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- shapes.</span></span>
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<pre style="margin: 0;">-<span id="LC101" class="line" lang="haskell"><span class="n" style="color: #333;">prettifyRefuts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DIdEnv</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DIdEnv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC102" class="line" lang="haskell"><span class="n" style="color: #333;">prettifyRefuts</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToUDFM_Directly</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">attach_refuts</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">udfmToList</span></span>
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"><span class="n" style="color: #333;">prettifyRefuts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DIdEnv</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DIdEnv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"><span class="n" style="color: #333;">prettifyRefuts</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToUDFM_Directly</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">attach_refuts</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">udfmToList</span></span>
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103
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC104" class="line" lang="haskell"> <span class="n" style="color: #333;">attach_refuts</span> <span class="p">(</span><span class="n" style="color: #333;">u</span><span class="p">,</span> <span class="n" style="color: #333;">sdoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">u</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">sdoc</span><span class="p">,</span> <span class="n" style="color: #333;">lookupRefuts</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">u</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"> <span class="n" style="color: #333;">attach_refuts</span> <span class="p">(</span><span class="n" style="color: #333;">u</span><span class="p">,</span> <span class="n" style="color: #333;">sdoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">u</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">sdoc</span><span class="p">,</span> <span class="n" style="color: #333;">lookupRefuts</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">u</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC107" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RWS</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="nb" style="color: #0086b3;">()</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DIdEnv</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">])</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RWS</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="nb" style="color: #0086b3;">()</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DIdEnv</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">])</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Try nice names p,q,r,s,t before using the (ugly) t_i</span></span>
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"><span class="n" style="color: #333;">nameList</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"><span class="n" style="color: #333;">nameList</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">text</span> <span class="p">[</span><span class="s" style="color: #d14;">"p"</span><span class="p">,</span><span class="s" style="color: #d14;">"q"</span><span class="p">,</span><span class="s" style="color: #d14;">"r"</span><span class="p">,</span><span class="s" style="color: #d14;">"s"</span><span class="p">,</span><span class="s" style="color: #d14;">"t"</span><span class="p">]</span> <span class="o" style="font-weight: 600;">++</span></span>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="p">(</span><span class="sc" style="color: #d14;">'t'</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">u</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">[(</span><span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span><span class="o" style="font-weight: 600;">..</span><span class="p">]</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC114" class="line" lang="haskell"><span class="n" style="color: #333;">runPmPpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DIdEnv</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC115" class="line" lang="haskell"><span class="n" style="color: #333;">runPmPpr</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">case</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">runRWS</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span> <span class="p">(</span><span class="n" style="color: #333;">emptyDVarEnv</span><span class="p">,</span> <span class="n" style="color: #333;">nameList</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"><span class="n" style="color: #333;">runPmPpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DIdEnv</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"><span class="n" style="color: #333;">runPmPpr</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">case</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">runRWS</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span> <span class="p">(</span><span class="n" style="color: #333;">emptyDVarEnv</span><span class="p">,</span> <span class="n" style="color: #333;">nameList</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">renamings</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">),</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">renamings</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="haskell"><span class="cd">-- | Allocates a new, clean name for the given 'Id' if it doesn't already have</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -129,8 +129,8 @@ getCleanName x = do</td>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"><span class="n" style="color: #333;">checkRefuts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- the clean name if it has negative info attached</span></span>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"><span class="n" style="color: #333;">checkRefuts</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC132" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ask</span></span>
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<pre style="margin: 0;">-<span id="LC133" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupRefuts</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ask</span></span>
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupRefuts</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="c1" style="color: #998; font-style: italic;">-- Will just be a wildcard later on</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getCleanName</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -144,8 +144,8 @@ pprPmVar :: PprPrec -> Id -> PmPprM SDoc</td>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The useful information in the latter case is the constructor that we missed,</span></span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- not the types of the wildcards in the places that aren't matched as a result.</span></span>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmVar</span> <span class="n" style="color: #333;">prec</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC147" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ask</span></span>
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupSolution</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ask</span></span>
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupSolution</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">alt</span><span class="p">,</span> <span class="n" style="color: #333;">_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPmAltCon</span> <span class="n" style="color: #333;">prec</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">fromMaybe</span> <span class="n" style="color: #333;">typed_wildcard</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">checkRefuts</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -160,24 +160,24 @@ pprPmVar prec x = do</td>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmAltCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PprPrec</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmAltCon</span> <span class="n" style="color: #333;">_prec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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162
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmAltCon</span> <span class="n" style="color: #333;">prec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl</span><span class="p">)</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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163
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<pre style="margin: 0;">-<span id="LC163" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ask</span></span>
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<pre style="margin: 0;">-<span id="LC164" class="line" lang="haskell"> <span class="n" style="color: #333;">pprConLike</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">prec</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ask</span></span>
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"> <span class="n" style="color: #333;">pprConLike</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">prec</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">args</span></span>
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165
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC166" class="line" lang="haskell"><span class="n" style="color: #333;">pprConLike</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PprPrec</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">-<span id="LC167" class="line" lang="haskell"><span class="n" style="color: #333;">pprConLike</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">_prec</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">args</span></span>
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168
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<pre style="margin: 0;">-<span id="LC168" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">pm_expr_list</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pmExprAsList</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"><span class="n" style="color: #333;">pprConLike</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PprPrec</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"><span class="n" style="color: #333;">pprConLike</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">_prec</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">pm_expr_list</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pmExprAsList</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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169
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">pm_expr_list</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NilTerminated</span> <span class="n" style="color: #333;">list</span> <span class="o" style="font-weight: 600;">-></span></span>
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171
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"> <span class="n" style="color: #333;">brackets</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fsep</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">pprPmVar</span> <span class="n" style="color: #333;">appPrec</span><span class="p">)</span> <span class="n" style="color: #333;">list</span></span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">WcVarTerminated</span> <span class="n" style="color: #333;">pref</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fcat</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">colon</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">pprPmVar</span> <span class="n" style="color: #333;">appPrec</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">toList</span> <span class="n" style="color: #333;">pref</span> <span class="o" style="font-weight: 600;">++</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"><span class="n" style="color: #333;">pprConLike</span> <span class="n" style="color: #333;">_<span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">_prec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="n" style="color: #333;">pprConLike</span> <span class="n" style="color: #333;">_<span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">_prec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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175
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isUnboxedTupleCon</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">hash_parens</span> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(#"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"#)"</span></span>
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hash_parens</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fsep</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">pprPmVar</span> <span class="n" style="color: #333;">appPrec</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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178
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTupleDataCon</span> <span class="n" style="color: #333;">con</span></span>
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179
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fsep</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">pprPmVar</span> <span class="n" style="color: #333;">appPrec</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="n" style="color: #333;">pprConLike</span> <span class="n" style="color: #333;">_<span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">prec</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"><span class="n" style="color: #333;">pprConLike</span> <span class="n" style="color: #333;">_<span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">prec</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">conLikeIsInfix</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">args</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">y</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">x'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pprPmVar</span> <span class="n" style="color: #333;">funPrec</span> <span class="n" style="color: #333;">x</span></span>
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183
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<pre style="margin: 0;"> <span id="LC183" class="line" lang="haskell"> <span class="n" style="color: #333;">y'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pprPmVar</span> <span class="n" style="color: #333;">funPrec</span> <span class="n" style="color: #333;">y</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -202,11 +202,11 @@ data PmExprList</td>
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ending in a wildcard variable x (of list type). Should be pretty-printed as</span></span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (1:2:_).</span></span>
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @pmExprAsList [] == Just ('NilTerminated' [])@</span></span>
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"><span class="n" style="color: #333;">pmExprAsList</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprList</span></span>
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"><span class="n" style="color: #333;">pmExprAsList</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_con</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="haskell"><span class="n" style="color: #333;">pmExprAsList</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprList</span></span>
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="haskell"><span class="n" style="color: #333;">pmExprAsList</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_con</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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207
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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208
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="haskell"> <span class="n" style="color: #333;">go_var</span> <span class="n" style="color: #333;">rev_pref</span> <span class="n" style="color: #333;">x</span></span>
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209
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">alt</span><span class="p">,</span> <span class="n" style="color: #333;">_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupSolution</span> <span class="n" style="color: #333;"><span class="idiff left right">delt</span>a</span> <span class="n" style="color: #333;">x</span></span>
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209
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">alt</span><span class="p">,</span> <span class="n" style="color: #333;">_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupSolution</span> <span class="n" style="color: #333;"><span class="idiff left right">nabl</span>a</span> <span class="n" style="color: #333;">x</span></span>
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210
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_con</span> <span class="n" style="color: #333;">rev_pref</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">args</span></span>
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211
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"> <span class="n" style="color: #333;">go_var</span> <span class="n" style="color: #333;">rev_pref</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">pref</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">nonEmpty</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">rev_pref</span><span class="p">)</span></span>
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<li id="a90b29966ba2a86c0f6927651648cb062f00ea03">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#a90b29966ba2a86c0f6927651648cb062f00ea03"><strong>compiler/GHC/HsToCore/PmCheck/Types.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -15,6 +15,7 @@ Author: George Karachalias <george.karachalias@cs.kuleuven.be></td>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck.Types</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Representations for Literals and AltCons</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">PmLitValue</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">pmLitType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pmAltConType</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isPmAltConMatchStrict</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pmAltConImplBangs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Equality on 'PmAltCon's</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmEquality</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">eqPmAltCon</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -35,8 +36,8 @@ module GHC.HsToCore.PmCheck.Types (</td>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">setIndirectSDIE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setEntrySDIE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">traverseSDIE</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * The pattern match oracle</span></span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">VarInfo</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmState</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TyState</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">initDeltas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">liftDelt</span>asM</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">BotInfo</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">VarInfo</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmState</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TyState</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nablas</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">initNablas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">liftNabl</span>asM</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -226,6 +227,19 @@ pmAltConType :: PmAltCon -> [Type] -> Type</td>
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"><span class="n" style="color: #333;">pmAltConType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="n" style="color: #333;">_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">_arg_tys</span> <span class="p">)</span> <span class="n" style="color: #333;">pmLitType</span> <span class="n" style="color: #333;">lit</span></span>
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<pre style="margin: 0;"> <span id="LC228" class="line" lang="haskell"><span class="n" style="color: #333;">pmAltConType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">conLikeResTy</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">arg_tys</span></span>
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<pre style="margin: 0;"> <span id="LC229" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="haskell"><span class="cd">-- | Is a match on this constructor forcing the match variable?</span></span>
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<pre style="margin: 0;">+<span id="LC231" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True of data constructors, literals and pattern synonyms (#17357), but not of</span></span>
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<pre style="margin: 0;">+<span id="LC232" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- newtypes.</span></span>
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Coverage checking Newtype matches] in "GHC.HsToCore.PmCheck.Oracle".</span></span>
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<pre style="margin: 0;">+<span id="LC234" class="line" lang="haskell"><span class="n" style="color: #333;">isPmAltConMatchStrict</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="haskell"><span class="n" style="color: #333;">isPmAltConMatchStrict</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span><span class="p">{}</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="haskell"><span class="n" style="color: #333;">isPmAltConMatchStrict</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- #17357</span></span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell"><span class="n" style="color: #333;">isPmAltConMatchStrict</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isNewDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="haskell"><span class="n" style="color: #333;">pmAltConImplBangs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsImplBang</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell"><span class="n" style="color: #333;">pmAltConImplBangs</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span><span class="p">{}</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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241
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"><span class="n" style="color: #333;">pmAltConImplBangs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">conLikeImplBangs</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Undecidable Equality for PmAltCons]</span></span>
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244
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Equality on overloaded literals is undecidable in the general case. Consider</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -477,6 +491,13 @@ instance Outputable a => Outputable (Shared a) where</td>
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491
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SharedDIdEnv</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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478
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492
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDIE</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">env</span></span>
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493
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<pre style="margin: 0;"> <span id="LC493" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC494" class="line" lang="haskell"><span class="cd">-- | See 'vi_bot'.</span></span>
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495
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<pre style="margin: 0;">+<span id="LC495" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">BotInfo</span></span>
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496
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<pre style="margin: 0;">+<span id="LC496" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span></span>
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<pre style="margin: 0;">+<span id="LC497" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span></span>
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<pre style="margin: 0;">+<span id="LC498" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span></span>
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<pre style="margin: 0;">+<span id="LC499" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span></span>
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<pre style="margin: 0;">+<span id="LC500" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC501" class="line" lang="haskell"><span class="cd">-- | The term oracle state. Stores 'VarInfo' for encountered 'Id's. These</span></span>
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- entries are possibly shared when we figure out that two variables must be</span></span>
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503
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<pre style="margin: 0;"> <span id="LC503" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- equal, thus represent the same set of values.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -531,6 +552,13 @@ data VarInfo</td>
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531
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<pre style="margin: 0;"> <span id="LC552" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because files like Cabal's `LicenseId` define relatively huge enums</span></span>
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<pre style="margin: 0;"> <span id="LC553" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that lead to quadratic or worse behavior.</span></span>
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554
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<pre style="margin: 0;"> <span id="LC554" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC555" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">BotInfo</span></span>
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<pre style="margin: 0;">+<span id="LC556" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Can this variable be ⊥? Models (mutually contradicting) @x ~ ⊥@ and</span></span>
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<pre style="margin: 0;">+<span id="LC557" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @x ~/ ⊥@ constraints. E.g.</span></span>
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<pre style="margin: 0;">+<span id="LC558" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * 'MaybeBot': Don't know; Neither @x ~ ⊥@ nor @x /~ ⊥@.</span></span>
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * 'IsBot': @x ~ ⊥@</span></span>
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * 'IsNotBot': @x /~ ⊥@</span></span>
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<pre style="margin: 0;">+<span id="LC561" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC562" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">vi_cache</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">PossibleMatches</span></span>
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<pre style="margin: 0;"> <span id="LC563" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A cache of the associated COMPLETE sets. At any time a superset of</span></span>
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<pre style="margin: 0;"> <span id="LC564" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- possible constructors of each COMPLETE set. So, if it's not in here, we</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -538,14 +566,19 @@ data VarInfo</td>
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to recognise completion of a COMPLETE set efficiently for large enums.</span></span>
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC569" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">BotInfo</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC570" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">empty</span></span>
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<pre style="margin: 0;">+<span id="LC571" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"~⊥"</span></span>
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<pre style="margin: 0;">+<span id="LC572" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"/~⊥"</span></span>
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<pre style="margin: 0;">+<span id="LC573" class="line" lang="haskell"></span>
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574
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<pre style="margin: 0;"> <span id="LC574" class="line" lang="haskell"><span class="cd">-- | Not user-facing.</span></span>
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<pre style="margin: 0;"> <span id="LC575" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="kr" style="font-weight: 600;">where</span></span>
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576
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">state</span> <span class="n" style="color: #333;">reps</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">state</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">reps</span></span>
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577
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="haskell"><span class="cd">-- | Not user-facing.</span></span>
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546
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579
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span> <span class="kr" style="font-weight: 600;">where</span></span>
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547
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<pre style="margin: 0;">-<span id="LC547" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">cache</span><span class="p">)</span></span>
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548
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<pre style="margin: 0;">-<span id="LC548" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">hcat</span> <span class="p">(</span><span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pos</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">neg</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cache</span><span class="p">]))</span></span>
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580
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;"><span class="idiff left">bot</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">cache</span><span class="p">)</span></span>
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581
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<pre style="margin: 0;">+<span id="LC581" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">hcat</span> <span class="p">(</span><span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pos</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">neg</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;"><span class="idiff left">bot</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">cache</span><span class="p">]))</span></span>
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582
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<pre style="margin: 0;"> <span id="LC582" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="haskell"><span class="cd">-- | Initial state of the term oracle.</span></span>
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell"><span class="n" style="color: #333;">initTmState</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -563,37 +596,38 @@ instance Outputable TyState where</td>
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<pre style="margin: 0;"> <span id="LC596" class="line" lang="haskell"><span class="n" style="color: #333;">initTyState</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span></span>
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<pre style="margin: 0;"> <span id="LC597" class="line" lang="haskell"><span class="n" style="color: #333;">initTyState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="n" style="color: #333;">emptyBag</span></span>
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<pre style="margin: 0;"> <span id="LC598" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC566" class="line" lang="haskell"><span class="cd">-- | An inert set of canonical (i.e. mutually compatible) term and type</span></span>
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<pre style="margin: 0;">-<span id="LC567" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constraints.</span></span>
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<pre style="margin: 0;">-<span id="LC568" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkDelta</span> <span class="p">{</span> <span class="n" style="color: #333;">delta_ty_st</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="c1" style="color: #998; font-style: italic;">-- Type oracle; things like a~Int</span></span>
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<pre style="margin: 0;">-<span id="LC569" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- Term oracle; things like x~Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC599" class="line" lang="haskell"><span class="cd">-- | A normalised refinement type, comprised of an inert set of canonical (i.e.</span></span>
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<pre style="margin: 0;">+<span id="LC600" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mutually compatible) term and type constraints that form the refinement</span></span>
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<pre style="margin: 0;">+<span id="LC601" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type's predicate.</span></span>
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<pre style="margin: 0;">+<span id="LC602" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkNabla</span> <span class="p">{</span> <span class="n" style="color: #333;">nabla_ty_st</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="c1" style="color: #998; font-style: italic;">-- Type oracle; things like a~Int</span></span>
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<pre style="margin: 0;">+<span id="LC603" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- Term oracle; things like x~Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC604" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC571" class="line" lang="haskell"><span class="cd">-- | An initial <span class="idiff left right">delt</span>a that is always satisfiable</span></span>
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<pre style="margin: 0;">-<span id="LC572" class="line" lang="haskell"><span class="n" style="color: #333;">init<span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span></span>
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<pre style="margin: 0;">-<span id="LC573" class="line" lang="haskell"><span class="n" style="color: #333;">init<span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MkDelt</span>a</span> <span class="n" style="color: #333;">initTyState</span> <span class="n" style="color: #333;">initTmState</span></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"><span class="cd">-- | An initial <span class="idiff left right">nabl</span>a that is always satisfiable</span></span>
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"><span class="n" style="color: #333;">init<span class="idiff left">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span></span>
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"><span class="n" style="color: #333;">init<span class="idiff left">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MkNabl</span>a</span> <span class="n" style="color: #333;">initTyState</span> <span class="n" style="color: #333;">initTmState</span></span>
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC575" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC576" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;"><span class="idiff left">delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hang</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff right">"Delt</span>a"</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span></span>
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<pre style="margin: 0;">+<span id="LC609" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC610" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;"><span class="idiff left">nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hang</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff right">"Nabl</span>a"</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span></span>
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- intentionally formatted this way enable the dev to comment in only</span></span>
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<pre style="margin: 0;"> <span id="LC612" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the info she needs</span></span>
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<pre style="margin: 0;">-<span id="LC579" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">delta_tm_st</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span><span class="p">),</span></span>
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<pre style="margin: 0;">-<span id="LC580" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">delta_ty_st</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC613" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">nabla_tm_st</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span><span class="p">),</span></span>
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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">nabla_ty_st</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC615" class="line" lang="haskell"> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC616" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC583" class="line" lang="haskell"><span class="cd">-- | A disjunctive bag of '<span class="idiff left right">Delt</span>a's, representing a refinement type.</span></span>
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584
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<pre style="margin: 0;">-<span id="LC584" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkDeltas</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Bag</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span><span class="p">)</span></span>
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617
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"><span class="cd">-- | A disjunctive bag of '<span class="idiff left right">Nabl</span>a's, representing a refinement type.</span></span>
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<pre style="margin: 0;">+<span id="LC618" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkNablas</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Bag</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span><span class="p">)</span></span>
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585
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC586" class="line" lang="haskell"><span class="n" style="color: #333;">init<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span></span>
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587
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<pre style="margin: 0;">-<span id="LC587" class="line" lang="haskell"><span class="n" style="color: #333;">init<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkDeltas</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unitBag</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">initDelt</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC620" class="line" lang="haskell"><span class="n" style="color: #333;">init<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"><span class="n" style="color: #333;">init<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkNablas</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unitBag</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">initNabl</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC622" class="line" lang="haskell"></span>
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589
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<pre style="margin: 0;">-<span id="LC589" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC590" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">deltas</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC623" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nabl</span>as</span></span>
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591
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<pre style="margin: 0;"> <span id="LC625" class="line" lang="haskell"></span>
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592
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<pre style="margin: 0;">-<span id="LC592" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Semigroup</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC593" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">l</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkDeltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">r</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MkDelt</span>as</span> <span class="p">(</span><span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC626" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Semigroup</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">l</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">r</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MkNabl</span>as</span> <span class="p">(</span><span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC595" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span> <span class="kr" style="font-weight: 600;">where</span></span>
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596
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<pre style="margin: 0;">-<span id="LC596" class="line" lang="haskell"> <span class="n" style="color: #333;">mempty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left right">Delt</span>as</span> <span class="n" style="color: #333;">emptyBag</span></span>
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<pre style="margin: 0;">+<span id="LC629" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC630" class="line" lang="haskell"> <span class="n" style="color: #333;">mempty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Mk<span class="idiff left right">Nabl</span>as</span> <span class="n" style="color: #333;">emptyBag</span></span>
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<pre style="margin: 0;"> <span id="LC631" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC598" class="line" lang="haskell"><span class="n" style="color: #333;">lift<span class="idiff left">DeltasM</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Monad</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=></span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Delta</span></span><span class="p"><span class="idiff">))</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span></span>
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<pre style="margin: 0;">-<span id="LC599" class="line" lang="haskell"><span class="n" style="color: #333;">lift<span class="idiff left">DeltasM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">f</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkDeltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ds</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MkDelt</span>as</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">catBagMaybes</span> <span class="o" style="font-weight: 600;"><$></span> <span class="p">(</span><span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">ds</span><span class="p">)</span></span></pre>
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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell"><span class="n" style="color: #333;">lift<span class="idiff left">NablasM</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Monad</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=></span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nabla</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nabla</span></span><span class="p"><span class="idiff">))</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"><span class="n" style="color: #333;">lift<span class="idiff left">NablasM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">f</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ds</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MkNabl</span>as</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">catBagMaybes</span> <span class="o" style="font-weight: 600;"><$></span> <span class="p">(</span><span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">ds</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#c69516c9e3cf2716177602126901a5efa3e92675"><strong>compiler/GHC/HsToCore/PmCheck/Types.hs-boot</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2,8 +2,8 @@ module GHC.HsToCore.PmCheck.Types where</td>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>a</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>a</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkDeltas</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Bag</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkNablas</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Bag</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">init<span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span></span></pre>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">init<span class="idiff left">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span></span></pre>
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<li id="7dcf5b567a6cd3c9d98cf8d57323fbca1b1536e9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#7dcf5b567a6cd3c9d98cf8d57323fbca1b1536e9"><strong>compiler/GHC/Tc/Types.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -106,7 +106,7 @@ import GHC.Tc.Types.Origin</td>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Annotations</span></span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.InstEnv</span></span>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FamInstEnv</span></span>
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<pre style="margin: 0;">-<span id="LC109" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">HsToCore</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">PmCheck</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Types</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Delt</span>as</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">HsToCore</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">PmCheck</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Types</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nabl</span>as</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.IOEnv</span></span>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Reader</span></span>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -324,9 +324,9 @@ data DsLclEnv = DsLclEnv {</td>
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<pre style="margin: 0;"> <span id="LC324" class="line" lang="haskell"> <span class="n" style="color: #333;">dsl_loc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RealSrcSpan</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- To put in pattern-matching error msgs</span></span>
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC326" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Note [Long-distance information] in "GHC.HsToCore.PmCheck"</span></span>
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<pre style="margin: 0;">-<span id="LC327" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The set of reaching values <span class="idiff left right">Delt</span>as is augmented as we walk inwards,</span></span>
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The set of reaching values <span class="idiff left right">Nabl</span>as is augmented as we walk inwards,</span></span>
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- refined through each pattern match in turn</span></span>
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<pre style="margin: 0;">-<span id="LC329" class="line" lang="haskell"> <span class="n" style="color: #333;">dsl_<span class="idiff left">deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Delt</span>as</span></span>
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"> <span class="n" style="color: #333;">dsl_<span class="idiff left">nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabl</span>as</span></span>
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<pre style="margin: 0;"> <span id="LC330" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC331" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC332" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Inside [| |] brackets, the desugarer looks</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#d811b82446879ec4c97bcda354f8b584093c251d"><strong>testsuite/tests/pmcheck/should_compile/T10183.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs, DataKinds, TypeOperators, UnicodeSyntax #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Foo</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.TypeLits</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">List</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">t</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nil</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∷</span> <span class="kt" style="color: #458; font-weight: 600;">List</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">t</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="p">(</span><span class="o" style="font-weight: 600;">:-</span><span class="p">)</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∷</span> <span class="n" style="color: #333;">t</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="kt" style="color: #458; font-weight: 600;">List</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">t</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="kt" style="color: #458; font-weight: 600;">List</span> <span class="p">(</span><span class="n" style="color: #333;">l</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">t</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">head'</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∷</span> <span class="p">(</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;"><=</span><span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">⇒</span> <span class="kt" style="color: #458; font-weight: 600;">List</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">t</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="n" style="color: #333;">t</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">head'</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:-</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TT</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TF</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">TT</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="kt" style="color: #458; font-weight: 600;">TT</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#ea4ab76dfa992c6d8ab81919e26cf38057ab01b5"><strong>testsuite/tests/pmcheck/should_compile/T17340.stderr</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -7,6 +7,10 @@ T17340.hs:19:4: warning: [-Wredundant-bang-patterns]</td>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> Pattern match has redundant bang</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> In an equation for ‘g’: g x = ...</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">T17340.hs:23:9: warning: [-Wredundant-bang-patterns]</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> Pattern match has redundant bang</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> In an equation for ‘h’: h x = ...</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext">T17340.hs:27:4: warning: [-Wredundant-bang-patterns]</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> Pattern match has redundant bang</span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext"> In an equation for ‘k’: k _ = ...</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#a3e785333a54d6cd9e0ec5f01ce25ab13dd74bb4"><strong>testsuite/tests/pmcheck/should_compile/T17378.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wincomplete-patterns -fforce-recomp #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE BangPatterns #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeOperators #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeApplications #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ScopedTypeVariables #-}</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE EmptyCase #-}</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Lib</span> <span class="kr" style="font-weight: 600;">where</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Type.Equality</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Functor.Identity</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Void</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">:~:</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">:~:</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{}</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Identity</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">:~:</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">:~:</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Identity</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Refl</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SMaybe</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SNothing</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">SJust</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="cd">-- | Exhaustive. Note how in addition to @{(a,b) | b /~ True}@, the value set</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @{(a,b) | y /~ SNothing, b ~ True}@ flows into the next equation, but @y@ is</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- no longer in scope. Normally, we have no way of matching on that without a</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- wildcard match, but in this case we refute @y ~ SJust z@ by unleashing type</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- evidence saying that @z@ must be 'Void' by matching on 'Void'.</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">:~:</span> <span class="kt" style="color: #458; font-weight: 600;">Void</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">|</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SMaybe</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SNothing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="kt" style="color: #458; font-weight: 600;">Refl</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#cd384e70c97d52531a8d863ee04c1293128fe8b0"><strong>testsuite/tests/pmcheck/should_compile/T17725.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wincomplete-patterns -fforce-recomp #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE BangPatterns #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Lib</span> <span class="kr" style="font-weight: 600;">where</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">IInt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IInt</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IInt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IInt</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IInt</span> <span class="mi" style="color: #099;">42</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#92278c7b1a1f3dc0e869d0627526997afb399a6a"><strong>testsuite/tests/pmcheck/should_compile/T17725.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T17725.hs:9:1: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In an equation for ‘f’: f (IInt 42) True = ...</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#06c9f4438df40d00db1bc36e427a2d0295bb90e1"><strong>testsuite/tests/pmcheck/should_compile/T17729.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PatternSynonyms #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -fforce-recomp -Wincomplete-patterns #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="n" style="color: #333;">incomplete</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">incomplete</span> <span class="n" style="color: #333;">ma</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">ma</span><span class="p">,</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# COMPLETE Pat #-}</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">print</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">incomplete</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#e72e3d237fb90415b63fed49e944d2737bff1e0e"><strong>testsuite/tests/pmcheck/should_compile/T17729.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T17729.hs:5:17: warning: [-Wincomplete-patterns (in -Wextra)]</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Pattern match(es) are non-exhaustive</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In a case alternative: Patterns not matched: ((Just _), ())</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#183ee9bd0a4ce291fd2bb7808db51aef0df645b2"><strong>testsuite/tests/pmcheck/should_compile/T18273.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -fforce-recomp -Wincomplete-patterns #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DataKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE EmptyCase #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies #-}</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Void</span></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">SFalse</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="kt" style="color: #458; font-weight: 600;">'False</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">STrue</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="kt" style="color: #458; font-weight: 600;">'True</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SFalse</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SFalse</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">STrue</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">STrue</span></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="kt" style="color: #458; font-weight: 600;">'False</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Void</span></span>
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21
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="kt" style="color: #458; font-weight: 600;">'True</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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22
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT1</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MkT2</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">ex</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="n" style="color: #333;">ex</span> <span class="n" style="color: #333;">sb</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">t</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkT1</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkT2</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">sb</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">STrue</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="n" style="color: #333;">ex2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="n" style="color: #333;">ex2</span> <span class="n" style="color: #333;">sb</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">t</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkT2</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">sb</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">STrue</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkT1</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#602562c1baef9bc3612a3df1420aae0c8f9d24b5"><strong>testsuite/tests/pmcheck/should_compile/T18341.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wincomplete-patterns -fforce-recomp #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE BangPatterns #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MagicHash #-}</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Lib</span> <span class="kr" style="font-weight: 600;">where</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="cp" style="color: #999; font-weight: 600;">{-# UNPACK #-}</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- inaccessible</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- redundant, not only inaccessible!</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- inaccessible</span></span>
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<td class="diff-line-num new new_line" data-linenumber="18" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- redundant, not only inaccessible!</span></span>
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19
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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20
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"></span>
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21
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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22
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- inaccessible</span></span>
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23
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- redundant, not only inaccessible!</span></span>
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24
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#2b900c9691abd631edaa1566b15d69ddad526943"><strong>testsuite/tests/pmcheck/should_compile/T18341.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18341.hs:12:18: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Pattern match has inaccessible right hand side</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In an equation for ‘f’: f (MkT _ _ _) | False = ...</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">T18341.hs:13:18: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> In an equation for ‘f’: f (MkT !_ _ _) | False = ...</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">T18341.hs:17:18: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> Pattern match has inaccessible right hand side</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> In an equation for ‘g’: g (MkT _ _ _) | False = ...</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">T18341.hs:18:18: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> In an equation for ‘g’: g (MkT _ !_ _) | False = ...</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">T18341.hs:22:18: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> Pattern match has inaccessible right hand side</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> In an equation for ‘h’: h (MkT _ _ _) | False = ...</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext">T18341.hs:23:18: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> In an equation for ‘h’: h (MkT _ _ !_) | False = ...</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#e77c2349085a6a6d7d8497374e962fb5a3507b84"><strong>testsuite/tests/pmcheck/should_compile/TooManyDeltas.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3,8 +3,10 @@</td>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- As a result, these functions elicit the symptoms describe in the warnings</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- message, e.g.</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - False positives on exhaustivity</span></span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - Turns redundant into inaccessible clauses</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - Fails to report redundant matches</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We used to turn redundant into inaccessible clauses, but SG was unable to</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- produce a testcase. See the comment below.</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">TooManyDeltas</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">B</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -13,12 +15,19 @@ data T = A | B</td>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- SG: As of July 2020, g doesn't reproduce anymore.</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Because we treat constructor matches lazily and push data con match</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- strictness into a preceding bang guard, The single place that calls the</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- throttling function will not regress in laziness. Note that by throttling we</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- can only "forget" the x /~ K constraint from unc_this, not the preceding</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- x /~ ⊥ constraint.</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="cd">-- | Reports that the third clause is inaccessible, when really it is</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- redundant.</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- inaccessible, correctly flagged</span></span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- redundant, <span class="idiff left right">not inaccessible!</span></span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- redundant, <span class="idiff left right">used to be inaccessible (see above).</span></span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- (this one is not about exhaustivity)</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="cd">-- | Fails to report that the second clause is redundant.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#94aa51e6715e17adfa284ea82a9eb53d9dce2bde"><strong>testsuite/tests/pmcheck/should_compile/TooManyDeltas.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">TooManyDeltas.hs:1<span class="idiff left right">4</span>:1: warning:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">TooManyDeltas.hs:1<span class="idiff left right">6</span>:1: warning:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> Pattern match checker ran into -fmax-pmcheck-models=0 limit, so</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> • Redundant clauses might not be reported at all</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> • Redundant clauses might be reported as inaccessible</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> • Patterns reported as unmatched might actually be matched</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> Increase the limit or resolve the warnings to suppress this message.</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext">TooManyDeltas.hs:1<span class="idiff left right">4</span>:1: warning: [-Wincomplete-patterns (in -Wextra)]</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">TooManyDeltas.hs:1<span class="idiff left right">6</span>:1: warning: [-Wincomplete-patterns (in -Wextra)]</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> Pattern match(es) are non-exhaustive</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> In an equation for ‘f’:</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> Patterns not matched:</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -15,17 +15,17 @@ TooManyDeltas.hs:14:1: warning: [-Wincomplete-patterns (in -Wextra)]</td>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> B A</span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext"> B B</span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext">TooManyDeltas.hs:<span class="idiff left right">19</span>:1: warning:</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">TooManyDeltas.hs:<span class="idiff left right">28</span>:1: warning:</span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext"> Pattern match checker ran into -fmax-pmcheck-models=0 limit, so</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext"> • Redundant clauses might not be reported at all</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"> • Redundant clauses might be reported as inaccessible</span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext"> • Patterns reported as unmatched might actually be matched</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext"> Increase the limit or resolve the warnings to suppress this message.</span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="plaintext">TooManyDeltas.hs:2<span class="idiff left right">0</span>:1: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext">TooManyDeltas.hs:2<span class="idiff left right">9</span>:1: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext"> Pattern match has inaccessible right hand side</span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext"> In an equation for ‘g’: g A A = ...</span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="plaintext">TooManyDeltas.hs:<span class="idiff left right">21</span>:1: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">-<span id="LC30" class="line" lang="plaintext"> Pattern match <span class="idiff left right">has inaccessible right hand side</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext">TooManyDeltas.hs:<span class="idiff left right">30</span>:1: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"> Pattern match <span class="idiff left right">is redundant</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext"> In an equation for ‘g’: g A A = ...</span></pre>
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<li id="a52966ece03f9e76a93a2c4ea96b9fb25368723d">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f9bf20d2d7c9d190023ad053eec82b9d1aad27#a52966ece03f9e76a93a2c4ea96b9fb25368723d"><strong>testsuite/tests/pmcheck/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -36,6 +36,8 @@ test('T9951b', [], compile,</td>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T9951</span><span class="p">',</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T10183</span><span class="p">',</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T11303</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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40
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42
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns +RTS -M1G -RTS</span><span class="p">'])</span></span>
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41
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43
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T11276</span><span class="p">',</span> <span class="nv" style="color: #008080;">collect_compiler_stats</span><span class="p">('</span><span class="s1" style="color: #d14;">bytes allocated</span><span class="p">',</span><span class="mi" style="color: #099;">10</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="110" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -108,12 +110,18 @@ test('T17357', expect_broken(17357), compile,</td>
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108
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110
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<td class="diff-line-num old_line" data-linenumber="109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
109
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<td class="diff-line-num new_line" data-linenumber="111" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
111
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17376</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
</pre>
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110
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<td class="diff-line-num new_line" data-linenumber="112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
112
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<td class="diff-line-num new new_line" data-linenumber="113" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
113
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17378</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="111" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="114" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
114
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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111
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<td class="diff-line-num new_line" data-linenumber="115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
115
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17465</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
112
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<td class="diff-line-num new_line" data-linenumber="116" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
116
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="113" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
113
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<td class="diff-line-num new_line" data-linenumber="117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
117
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17646</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="114" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
114
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<td class="diff-line-num new_line" data-linenumber="118" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
118
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
115
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<td class="diff-line-num new_line" data-linenumber="119" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
119
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17703</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="116" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
116
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<td class="diff-line-num new_line" data-linenumber="120" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
120
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="121" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
121
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17725</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="122" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
122
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="123" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
123
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17729</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="124" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
124
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
</pre>
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117
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<td class="diff-line-num new_line" data-linenumber="125" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
125
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17783</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="118" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
118
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<td class="diff-line-num new_line" data-linenumber="126" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
126
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="119" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
119
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<td class="diff-line-num new_line" data-linenumber="127" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
127
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17977</span><span class="p">',</span> <span class="nv" style="color: #008080;">collect_compiler_stats</span><span class="p">('</span><span class="s1" style="color: #d14;">bytes allocated</span><span class="p">',</span><span class="mi" style="color: #099;">10</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
</pre>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -122,6 +130,10 @@ test('T17977b', collect_compiler_stats('bytes allocated',10), compile,</td>
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122
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130
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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123
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131
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18049</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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124
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132
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<td class="diff-line-num new new_line" data-linenumber="133" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
133
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18273</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<td class="diff-line-num new old_line" data-linenumber="125" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="134" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
134
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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135
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18341</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="136" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
136
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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125
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<td class="diff-line-num new_line" data-linenumber="137" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
137
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18478</span><span class="p">',</span> <span class="nv" style="color: #008080;">collect_compiler_stats</span><span class="p">('</span><span class="s1" style="color: #d14;">bytes allocated</span><span class="p">',</span><span class="mi" style="color: #099;">10</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="126" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
126
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138
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<td class="diff-line-num old_line" data-linenumber="127" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
127
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139
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18533</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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