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<h3>
Richard Eisenberg pushed to branch wip/hole-refactor
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c">8147d941</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-05-03T18:19:28+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor hole constraints.
Previously, holes (both expression holes / out of scope variables and
partial-type-signature wildcards) were emitted as *constraints* via
the CHoleCan constructor. While this worked fine for error reporting,
there was a fair amount of faff in keeping these constraints in line.
In particular, and unlike other constraints, we could never change
a CHoleCan to become CNonCanonical. In addition:
* the "predicate" of a CHoleCan constraint was really the type
of the hole, which is not a predicate at all
* type-level holes (partial type signature wildcards) carried
evidence, which was never used
* tcNormalise (used in the pattern-match checker) had to create
a hole constraint just to extract it again; it was quite messy
The new approach is to record holes directly in WantedConstraints.
It flows much more nicely now.
Along the way, I did some cleaning up of commentary in
GHC.Tc.Errors.Hole, which I had a hard time understanding.
This was instigated by a future patch that will refactor
the way predicates are handled. The fact that CHoleCan's
"predicate" wasn't really a predicate is incompatible with
that future patch.
No test case, because this is meant to be purely internal.
</pre>
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<h4>23 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
compiler/GHC/HsToCore/PmCheck/Oracle.hs
</a>
</li>
<li class="file-stats">
<a href="#4a238b7fd965f958b107d110c96d07962d7a83ec">
compiler/GHC/Plugins.hs
</a>
</li>
<li class="file-stats">
<a href="#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
compiler/GHC/Tc/Errors.hs
</a>
</li>
<li class="file-stats">
<a href="#897218b3e24728ae9e5b0329b949493f1ede80fb">
compiler/GHC/Tc/Errors/Hole.hs
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<li class="file-stats">
<a href="#cf93ddc86e104212f370f013f519e12cc11e1f70">
compiler/GHC/Tc/Errors/Hole.hs-boot
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<li class="file-stats">
<a href="#62e5fd382d9730853d0cbcec70620f1065b107cf">
compiler/GHC/Tc/Errors/Hole/FitTypes.hs
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<li class="file-stats">
<a href="#902811828741e6bcd64702935bbb54edbbd070ef">
compiler/GHC/Tc/Gen/Expr.hs
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<li class="file-stats">
<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<li class="file-stats">
<a href="#04338da99bccd89402218ca19c5724762f0fe641">
compiler/GHC/Tc/Gen/Rule.hs
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<li class="file-stats">
<a href="#e65390fa5a32c453a81a1c9a3e1c4464d155ca4a">
compiler/GHC/Tc/Module.hs
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<li class="file-stats">
<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<li class="file-stats">
<a href="#81707f1fe21087531cefd70879aa09c2be5c1d22">
compiler/GHC/Tc/Solver/Flatten.hs
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<li class="file-stats">
<a href="#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e">
compiler/GHC/Tc/Solver/Interact.hs
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<li class="file-stats">
<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<li class="file-stats">
<a href="#3b6d78a50c8462304f843b952a88e531718dbbd2">
compiler/GHC/Tc/Types/Constraint.hs
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<li class="file-stats">
<a href="#93bba9b9e0195db135fec54160523a427ea042fd">
compiler/GHC/Tc/Types/Origin.hs
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<li class="file-stats">
<a href="#c6e4263ee64c68e57b7525127d98243fce38b1ea">
compiler/GHC/Tc/Utils/Monad.hs
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<li class="file-stats">
<a href="#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">
compiler/GHC/Tc/Utils/TcMType.hs
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<li class="file-stats">
<a href="#2430cf6bd49f7c94008b89548971a935c1b1cd77">
testsuite/tests/partial-sigs/should_compile/SplicesUsed.stderr
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<li class="file-stats">
<a href="#57693ae880b4d4609bd2d8f0fb6f13038ffa4938">
testsuite/tests/plugins/hole-fit-plugin/HoleFitPlugin.hs
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<li class="file-stats">
<a href="#a2ebc58a8a04e3d568778d697d697c73fc174dfa">
testsuite/tests/th/T12411.stderr
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<li class="file-stats">
<a href="#20113928cc39af49e4c89479c9a680c352e8e69f">
testsuite/tests/typecheck/should_fail/T12589.stderr
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</ul>
<h4>Changes:</h4>
<li id="8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564"><strong>compiler/GHC/HsToCore/PmCheck/Oracle.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">@@ -438,7 +438,7 @@ then</td>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtypes.</span></span>
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<pre style="margin: 0;"> <span id="LC439" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (b) dcs is the list of newtype constructors "skipped", every time we normalise</span></span>
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<pre style="margin: 0;"> <span id="LC440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a newtype to its core representation, we keep track of the source data</span></span>
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<pre style="margin: 0;">-<span id="LC441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constructor. For convenien<span class="idiff left right">v</span>e, we also track the type we unwrap and the</span></span>
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<pre style="margin: 0;">+<span id="LC441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constructor. For convenien<span class="idiff left right">c</span>e, we also track the type we unwrap and the</span></span>
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type of its field. Example: @Down 42@ => @[(Down @Int, Down, Int)]</span></span>
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<pre style="margin: 0;"> <span id="LC443" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (c) core_ty is the rewritten type. That is,</span></span>
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pmTopNormaliseType env ty_cs ty = Just (src_ty, dcs, core_ty)</span></span>
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<li id="4a238b7fd965f958b107d110c96d07962d7a83ec">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#4a238b7fd965f958b107d110c96d07962d7a83ec"><strong>compiler/GHC/Plugins.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="48" 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">@@ -48,6 +48,7 @@ module GHC.Plugins</td>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">module</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;">Utils</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">module</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;">Types</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Unique</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Supply</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">module</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;">Data</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">FastString</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">module</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;">Tc</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Errors</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">FitTypes</span> <span class="c1" style="color: #998; font-style: italic;">-- for hole-fit plugins</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"> <span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- * Getting 'Name's</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">thNameToGhcName</span></span>
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<pre style="margin: 0;"> <span id="LC54" 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">@@ -121,6 +122,8 @@ import GHC.Utils.Monad ( mapMaybeM )</td>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.ThToHs</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">thRdrNameGuesses</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Env</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">lookupGlobal</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Errors.Hole.FitTypes</span></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Language.Haskell.TH</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">TH</span></span>
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- This instance is defined outside GHC.Core.Opt.Monad.hs so that</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76"><strong>compiler/GHC/Tc/Errors.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">@@ -285,8 +285,8 @@ important :: SDoc -> Report</td>
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<pre style="margin: 0;"> <span id="LC285" class="line" lang="haskell"><span class="n" style="color: #333;">important</span> <span class="n" style="color: #333;">doc</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;">report_important</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">doc</span><span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC286" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC287" class="line" lang="haskell"><span class="cd">-- | Put a doc into the relevant bindings block.</span></span>
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<pre style="margin: 0;">-<span id="LC288" class="line" lang="haskell"><span class="n" style="color: #333;">relevant_bindings</span> <span class="o" style="font-weight: 600;">::</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;">Report</span></span>
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<pre style="margin: 0;">-<span id="LC289" class="line" lang="haskell"><span class="n" style="color: #333;">relevant_bindings</span> <span class="n" style="color: #333;">doc</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;">report_relevant_bindings</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">doc</span><span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC288" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">mk_</span>relevant_bindings</span> <span class="o" style="font-weight: 600;">::</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;">Report</span></span>
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">mk_</span>relevant_bindings</span> <span class="n" style="color: #333;">doc</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;">report_relevant_bindings</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">doc</span><span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC290" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC291" class="line" lang="haskell"><span class="cd">-- | Put a doc into the valid hole fits block.</span></span>
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<pre style="margin: 0;"> <span id="LC292" class="line" lang="haskell"><span class="n" style="color: #333;">valid_hole_fits</span> <span class="o" style="font-weight: 600;">::</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;">Report</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">@@ -524,16 +524,29 @@ This only matters in instance declarations..</td>
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<pre style="margin: 0;"> <span id="LC524" 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="LC525" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"><span class="n" style="color: #333;">reportWanteds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC527" class="line" lang="haskell"><span class="n" style="color: #333;">reportWanteds</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell"><span class="n" style="color: #333;">reportWanteds</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span></span>
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<pre style="margin: 0;">+<span id="LC528" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">holes</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC529" 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;">traceTc</span> <span class="s" style="color: #d14;">"reportWanteds"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Simples ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;">-<span id="LC529" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Suppress ="</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;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)])</span></span>
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<pre style="margin: 0;">-<span id="LC530" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"rw2"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tidy_cts</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC531" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC532" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- First deal with things that are utterly wrong</span></span>
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Suppress ="</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;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tidy_cts ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tidy_cts</span></span>
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tidy_holes = "</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tidy_holes</span> <span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC534" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- First, deal with any out-of-scope errors:</span></span>
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<pre style="margin: 0;">+<span id="LC535" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">out_of_scope</span><span class="p">,</span> <span class="n" style="color: #333;">other_holes</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partition</span> <span class="n" style="color: #333;">isOutOfScopeHole</span> <span class="n" style="color: #333;">tidy_holes</span></span>
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<pre style="margin: 0;">+<span id="LC536" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- don't suppress out-of-scope errors</span></span>
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt_for_scope_errs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">{</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC538" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">no_out_of_scope</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">askNoErrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"> <span class="n" style="color: #333;">reportHoles</span> <span class="n" style="color: #333;">tidy_cts</span> <span class="n" style="color: #333;">ctxt_for_scope_errs</span> <span class="n" style="color: #333;">out_of_scope</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC541" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Next, deal with things that are utterly wrong</span></span>
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<pre style="margin: 0;"> <span id="LC542" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Like Int ~ Bool (incl nullary TyCons)</span></span>
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<pre style="margin: 0;"> <span id="LC543" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- or Int ~ t a (AppTy on one side)</span></span>
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<pre style="margin: 0;"> <span id="LC544" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- These /ones/ are not suppressed by the incoming context</span></span>
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<pre style="margin: 0;">-<span id="LC536" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ctxt_for_insols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">{</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC545" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (but will be by out-of-scope errors)</span></span>
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<pre style="margin: 0;">+<span id="LC546" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ctxt_for_insols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">{</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">no_out_of_scope</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC547" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">reportHoles</span> <span class="n" style="color: #333;">tidy_cts</span> <span class="n" style="color: #333;">ctxt_for_insols</span> <span class="n" style="color: #333;">other_holes</span></span>
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<pre style="margin: 0;">+<span id="LC548" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- holes never suppress</span></span>
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<pre style="margin: 0;">+<span id="LC549" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC550" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt1</span><span class="p">,</span> <span class="n" style="color: #333;">cts1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tryReporters</span> <span class="n" style="color: #333;">ctxt_for_insols</span> <span class="n" style="color: #333;">report1</span> <span class="n" style="color: #333;">tidy_cts</span></span>
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<pre style="margin: 0;"> <span id="LC551" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC552" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now all the other constraints. We suppress errors here if</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">@@ -554,7 +567,8 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics })</td>
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if there's a *given* insoluble here (= inaccessible code)</span></span>
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC569" 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;">cec_tidy</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;">-<span id="LC557" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bagToList</span> <span class="p">(</span><span class="n" style="color: #333;">mapBag</span> <span class="p">(</span><span class="n" style="color: #333;">tidyCt</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">simples</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC570" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bagToList</span> <span class="p">(</span><span class="n" style="color: #333;">mapBag</span> <span class="p">(</span><span class="n" style="color: #333;">tidyCt</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">simples</span><span class="p">)</span></span>
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571
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<pre style="margin: 0;">+<span id="LC571" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bagToList</span> <span class="p">(</span><span class="n" style="color: #333;">mapBag</span> <span class="p">(</span><span class="n" style="color: #333;">tidyHole</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">holes</span><span class="p">)</span></span>
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558
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572
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="haskell"></span>
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559
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573
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<pre style="margin: 0;"> <span id="LC573" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- report1: ones that should *not* be suppressed by</span></span>
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560
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574
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<pre style="margin: 0;"> <span id="LC574" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- an insoluble somewhere else in the tree</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">@@ -562,9 +576,7 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics })</td>
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562
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576
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (see GHC.Tc.Utils.insolubleCt) is caught here, otherwise</span></span>
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563
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577
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we might suppress its error message, and proceed on past</span></span>
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564
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578
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type checking to get a Lint error later</span></span>
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565
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<pre style="margin: 0;">-<span id="LC565" class="line" lang="haskell"> <span class="n" style="color: #333;">report1</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">(</span><span class="s" style="color: #d14;">"Out of scope"</span><span class="p">,</span> <span class="n" style="color: #333;">unblocked</span> <span class="n" style="color: #333;">is_out_of_scope</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkHoleReporter</span> <span class="n" style="color: #333;">tidy_cts</span><span class="p">)</span></span>
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566
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<pre style="margin: 0;">-<span id="LC566" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"Holes"</span><span class="p">,</span> <span class="n" style="color: #333;">unblocked</span> <span class="n" style="color: #333;">is_hole</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">mkHoleReporter</span> <span class="n" style="color: #333;">tidy_cts</span><span class="p">)</span></span>
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567
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<pre style="margin: 0;">-<span id="LC567" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"custom_error"</span><span class="p">,</span> <span class="n" style="color: #333;">unblocked</span> <span class="n" style="color: #333;">is_user_type_error</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkUserTypeErrorReporter</span><span class="p">)</span></span>
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579
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="haskell"> <span class="n" style="color: #333;">report1</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">(</span><span class="s" style="color: #d14;">"custom_error"</span><span class="p">,</span> <span class="n" style="color: #333;">unblocked</span> <span class="n" style="color: #333;">is_user_type_error</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkUserTypeErrorReporter</span><span class="p">)</span></span>
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568
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580
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="haskell"></span>
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569
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581
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">given_eq_spec</span></span>
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570
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582
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<pre style="margin: 0;"> <span id="LC582" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"insoluble2"</span><span class="p">,</span> <span class="n" style="color: #333;">unblocked</span> <span class="n" style="color: #333;">utterly_wrong</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkEqErr</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="593" 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="605" 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">@@ -593,8 +605,7 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics })</td>
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593
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605
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<pre style="margin: 0;"> <span id="LC605" class="line" lang="haskell"> <span class="n" style="color: #333;">unblocked</span> <span class="n" style="color: #333;">checker</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">checker</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">pred</span></span>
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594
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606
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<pre style="margin: 0;"> <span id="LC606" class="line" lang="haskell"></span>
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595
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607
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<pre style="margin: 0;"> <span id="LC607" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- rigid_nom_eq, rigid_nom_tv_eq,</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;">is_hole</span><span class="p">,</span> <span class="n" style="color: #333;">is_dict</span><span class="p">,</span></span>
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597
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<pre style="margin: 0;">-<span id="LC597" class="line" lang="haskell"> <span class="n" style="color: #333;">is_equality</span><span class="p">,</span> <span class="n" style="color: #333;">is_ip</span><span class="p">,</span> <span class="n" style="color: #333;">is_irred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pred</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="LC608" class="line" lang="haskell"> <span class="n" style="color: #333;">is_dict</span><span class="p">,</span> <span class="n" style="color: #333;">is_equality</span><span class="p">,</span> <span class="n" style="color: #333;">is_ip</span><span class="p">,</span> <span class="n" style="color: #333;">is_irred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pred</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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609
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="haskell"></span>
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610
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<pre style="margin: 0;"> <span id="LC610" class="line" lang="haskell"> <span class="n" style="color: #333;">is_given_eq</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">pred</span></span>
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600
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611
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arisesFromGivens</span> <span class="n" style="color: #333;">ct</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="617" 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="628" 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">@@ -617,9 +628,6 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics })</td>
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617
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628
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell"> <span class="n" style="color: #333;">non_tv_eq</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="n" style="color: #333;">ty1</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;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTyVarTy</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span></span>
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618
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629
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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell"> <span class="n" style="color: #333;">non_tv_eq</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="kt" style="color: #458; font-weight: 600;">False</span></span>
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619
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630
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<pre style="margin: 0;"> <span id="LC630" class="line" lang="haskell"></span>
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620
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<pre style="margin: 0;">-<span id="LC620" class="line" lang="haskell"> <span class="n" style="color: #333;">is_out_of_scope</span> <span class="n" style="color: #333;">ct</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isOutOfScopeCt</span> <span class="n" style="color: #333;">ct</span></span>
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621
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<pre style="margin: 0;">-<span id="LC621" class="line" lang="haskell"> <span class="n" style="color: #333;">is_hole</span> <span class="n" style="color: #333;">ct</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isHoleCt</span> <span class="n" style="color: #333;">ct</span></span>
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622
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<pre style="margin: 0;">-<span id="LC622" class="line" lang="haskell"></span>
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631
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<pre style="margin: 0;"> <span id="LC631" class="line" lang="haskell"> <span class="n" style="color: #333;">is_user_type_error</span> <span class="n" style="color: #333;">ct</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isUserTypeErrorCt</span> <span class="n" style="color: #333;">ct</span></span>
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624
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632
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="haskell"></span>
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633
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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell"> <span class="n" style="color: #333;">is_homo_equality</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty1</span> <span class="p">`</span><span class="n" style="color: #333;">tcEqType</span><span class="p">`</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty2</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="705" 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="713" 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">@@ -705,12 +713,12 @@ mkSkolReporter ctxt cts</td>
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705
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713
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<pre style="margin: 0;"> <span id="LC713" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">eq_lhs_type</span> <span class="n" style="color: #333;">ct1</span> <span class="n" style="color: #333;">ct2</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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706
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714
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<pre style="margin: 0;"> <span id="LC714" 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;">False</span></span>
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707
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715
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<pre style="margin: 0;"> <span id="LC715" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC708" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">mkHoleReporter</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">Ct</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">Reporter</span></span></span>
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709
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<pre style="margin: 0;">-<span id="LC709" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- Reports errors one at a time</span></span></span>
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710
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<pre style="margin: 0;">-<span id="LC710" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">mkHoleReporter</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tidy_simple</span>s</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;">-<span id="LC711" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM_</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">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="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">err</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">mkHoleError</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tidy_simples</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ct</span></span></span>
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<pre style="margin: 0;">-<span id="LC712" class="line" lang="haskell"> <span class="p"><span class="idiff left">;</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">maybeReportHoleError</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ct</span></span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;">-<span id="LC713" class="line" lang="haskell"> <span class="p"><span class="idiff left">;</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">maybeAddDeferredHoleBinding</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">err</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ct</span></span> <span class="p">}</span></span>
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716
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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">reportHoles</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">Ct</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">-- other (tidied) constraints</span></span></span>
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717
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"><span class="idiff left"> </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">ReportErrCtxt</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">Hole</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">TcM</span></span><span class="idiff"> </span><span class="nb" style="color: #0086b3;"><span class="idiff right">()</span></span></span>
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718
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">reportHoles</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tidy_ct</span>s</span> <span class="n" style="color: #333;">ctxt</span></span>
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719
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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM_</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">hole</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">err</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">mkHoleError</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tidy_cts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hole</span></span></span>
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720
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">;</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">maybeReportHoleError</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hole</span></span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">;</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">maybeAddDeferredHoleBinding</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">err</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hole</span></span> <span class="p">}</span></span>
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714
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<pre style="margin: 0;"> <span id="LC722" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC723" class="line" lang="haskell"><span class="n" style="color: #333;">mkUserTypeErrorReporter</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Reporter</span></span>
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724
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<pre style="margin: 0;"> <span id="LC724" class="line" lang="haskell"><span class="n" style="color: #333;">mkUserTypeErrorReporter</span> <span class="n" style="color: #333;">ctxt</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="742" 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">@@ -742,7 +750,7 @@ mkGivenErrorReporter ctxt cts</td>
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742
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750
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<pre style="margin: 0;"> <span id="LC750" class="line" lang="haskell"> <span class="n" style="color: #333;">inaccessible_msg</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;">text</span> <span class="s" style="color: #d14;">"Inaccessible code in"</span><span class="p">)</span></span>
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743
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751
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<pre style="margin: 0;"> <span id="LC751" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">ic_info</span> <span class="n" style="color: #333;">implic</span><span class="p">))</span></span>
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744
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752
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<pre style="margin: 0;"> <span id="LC752" class="line" lang="haskell"> <span class="n" style="color: #333;">report</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">important</span> <span class="n" style="color: #333;">inaccessible_msg</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span></span>
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745
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<pre style="margin: 0;">-<span id="LC745" class="line" lang="haskell"> <span class="n" style="color: #333;">relevant_bindings</span> <span class="n" style="color: #333;">binds_msg</span></span>
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753
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<pre style="margin: 0;">+<span id="LC753" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">mk_</span>relevant_bindings</span> <span class="n" style="color: #333;">binds_msg</span></span>
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754
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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="p">;</span> <span class="n" style="color: #333;">err</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkEqErr_help</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">report</span> <span class="n" style="color: #333;">ct'</span></span>
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756
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<pre style="margin: 0;"> <span id="LC756" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</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">@@ -843,15 +851,27 @@ suppressGroup mk_err ctxt cts</td>
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843
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851
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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"Suppressing errors for"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span></span>
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844
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852
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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">addDeferredBinding</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err</span><span class="p">)</span> <span class="n" style="color: #333;">cts</span> <span class="p">}</span></span>
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845
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853
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"></span>
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846
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<pre style="margin: 0;">-<span id="LC846" class="line" lang="haskell"><span class="n" style="color: #333;">maybeReportHoleError</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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854
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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"><span class="n" style="color: #333;">maybeReportHoleError</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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855
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"><span class="n" style="color: #333;">maybeReportHoleError</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hole</span> <span class="n" style="color: #333;">err</span></span>
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856
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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isOutOfScopeHole</span> <span class="n" style="color: #333;">hole</span></span>
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<pre style="margin: 0;">+<span id="LC857" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Always report an error for out-of-scope variables</span></span>
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<pre style="margin: 0;">+<span id="LC858" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Unless -fdefer-out-of-scope-variables is on,</span></span>
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859
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in which case the messages are discarded.</span></span>
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See #12170, #12406</span></span>
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<pre style="margin: 0;">+<span id="LC861" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- If deferring, report a warning only if -Wout-of-scope-variables is on</span></span>
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">cec_out_of_scope_holes</span> <span class="n" style="color: #333;">ctxt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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863
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleError</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">reportError</span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleWarn</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC865" class="line" lang="haskell"> <span class="n" style="color: #333;">reportWarning</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Reason</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnDeferredOutOfScopeVariables</span><span class="p">)</span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;">+<span id="LC866" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleDefer</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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867
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<pre style="margin: 0;">+<span id="LC867" class="line" lang="haskell"></span>
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868
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Unlike maybeReportError, these "hole" errors are</span></span>
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869
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- /not/ suppressed by cec_suppress. We want to see them!</span></span>
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<pre style="margin: 0;">-<span id="LC849" class="line" lang="haskell"><span class="n" style="color: #333;">maybeReportHoleError</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;"><span class="idiff left right">ct</span></span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;">+<span id="LC870" class="line" lang="haskell"><span class="n" style="color: #333;">maybeReportHoleError</span> <span class="n" style="color: #333;">ctxt</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Hole</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">hole_sort</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">TypeHole</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">})</span></span> <span class="n" style="color: #333;">err</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;">-- When -XPartialTypeSignatures is on, warnings (instead of errors) are</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;">-- generated for holes in partial type signatures.</span></span>
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852
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873
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<pre style="margin: 0;"> <span id="LC873" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Unless -fwarn-partial-type-signatures is not on,</span></span>
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853
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874
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<pre style="margin: 0;"> <span id="LC874" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in which case the messages are discarded.</span></span>
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854
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<pre style="margin: 0;">-<span id="LC854" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTypeHoleCt</span> <span class="n" style="color: #333;">ct</span></span>
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855
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875
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<pre style="margin: 0;"> <span id="LC875" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- For partial type signatures, generate warnings only, and do that</span></span>
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856
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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;">-- only if -fwarn-partial-type-signatures is on</span></span>
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857
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877
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<pre style="margin: 0;"> <span id="LC877" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">cec_type_holes</span> <span class="n" style="color: #333;">ctxt</span> <span class="kr" style="font-weight: 600;">of</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">@@ -859,22 +879,12 @@ maybeReportHoleError ctxt ct err</td>
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859
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleWarn</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">reportWarning</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Reason</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnPartialTypeSignatures</span><span class="p">)</span> <span class="n" style="color: #333;">err</span></span>
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860
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880
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<pre style="margin: 0;"> <span id="LC880" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleDefer</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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881
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<pre style="margin: 0;"> <span id="LC881" class="line" lang="haskell"></span>
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862
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<pre style="margin: 0;">-<span id="LC862" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Always report an error for out-of-scope variables</span></span>
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863
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<pre style="margin: 0;">-<span id="LC863" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Unless -fdefer-out-of-scope-variables is on,</span></span>
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864
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<pre style="margin: 0;">-<span id="LC864" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in which case the messages are discarded.</span></span>
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865
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<pre style="margin: 0;">-<span id="LC865" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See #12170, #12406</span></span>
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866
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<pre style="margin: 0;">-<span id="LC866" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isOutOfScopeCt</span> <span class="n" style="color: #333;">ct</span></span>
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867
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<pre style="margin: 0;">-<span id="LC867" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- If deferring, report a warning only if -Wout-of-scope-variables is on</span></span>
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868
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<pre style="margin: 0;">-<span id="LC868" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">cec_out_of_scope_holes</span> <span class="n" style="color: #333;">ctxt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC869" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleError</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">reportError</span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;">-<span id="LC870" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleWarn</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC871" class="line" lang="haskell"> <span class="n" style="color: #333;">reportWarning</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Reason</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnDeferredOutOfScopeVariables</span><span class="p">)</span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;">-<span id="LC872" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleDefer</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC873" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC882" class="line" lang="haskell"><span class="n" style="color: #333;">maybeReportHoleError</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hole</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_sort</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExprHole</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">})</span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;"> <span id="LC883" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Otherwise this is a typed hole in an expression,</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;">-- but not for an out-of-scope variable</span></span>
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">|</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">otherwise</span></span></span>
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but not for an out-of-scope variable<span class="idiff left right"> (because that goes through a</span></span></span>
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<pre style="margin: 0;">+<span id="LC885" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- different function)</span></span></span>
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<pre style="margin: 0;"> <span id="LC886" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- If deferring, report a warning only if -Wtyped-holes is on</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;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isOutOfScopeHole</span> <span class="n" style="color: #333;">hole</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC888" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">cec_expr_holes</span> <span class="n" style="color: #333;">ctxt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC889" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleError</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">reportError</span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;"> <span id="LC890" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleWarn</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">reportWarning</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Reason</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnTypedHoles</span><span class="p">)</span> <span class="n" style="color: #333;">err</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">@@ -899,10 +909,7 @@ addDeferredBinding ctxt err ct</td>
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<pre style="margin: 0;"> <span id="LC909" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;"> <span id="LC910" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Only add deferred bindings for Wanted constraints</span></span>
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<pre style="margin: 0;"> <span id="LC911" 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="LC902" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">err_msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprLocErrMsg</span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;">-<span id="LC903" class="line" lang="haskell"> <span class="n" style="color: #333;">err_fs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFastString</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">showSDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">$</span></span>
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904
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<pre style="margin: 0;">-<span id="LC904" class="line" lang="haskell"> <span class="n" style="color: #333;">err_msg</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(deferred type error)"</span></span>
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905
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<pre style="margin: 0;">-<span id="LC905" class="line" lang="haskell"> <span class="n" style="color: #333;">err_tm</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">evDelayedError</span> <span class="n" style="color: #333;">pred</span> <span class="n" style="color: #333;">err_fs</span></span>
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912
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<pre style="margin: 0;">+<span id="LC912" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">err_tm</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkErrorTerm</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">pred</span> <span class="n" style="color: #333;">err</span></span>
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906
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913
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<pre style="margin: 0;"> <span id="LC913" class="line" lang="haskell"> <span class="n" style="color: #333;">ev_binds_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cec_binds</span> <span class="n" style="color: #333;">ctxt</span></span>
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907
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914
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<pre style="margin: 0;"> <span id="LC914" class="line" lang="haskell"></span>
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908
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915
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<pre style="margin: 0;"> <span id="LC915" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">dest</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="917" 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">@@ -917,11 +924,27 @@ addDeferredBinding ctxt err ct</td>
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924
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<pre style="margin: 0;"> <span id="LC924" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- Do not set any evidence for Given/Derived</span></span>
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918
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925
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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;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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919
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926
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<pre style="margin: 0;"> <span id="LC926" class="line" lang="haskell"></span>
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920
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<pre style="margin: 0;">-<span id="LC920" class="line" lang="haskell"><span class="n" style="color: #333;">maybeAddDeferredHoleBinding</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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921
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<pre style="margin: 0;">-<span id="LC921" class="line" lang="haskell"><span class="n" style="color: #333;">maybeAddDeferredHoleBinding</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err</span> <span class="n" style="color: #333;">ct</span></span>
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922
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<pre style="margin: 0;">-<span id="LC922" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isExprHoleCt</span> <span class="n" style="color: #333;">ct</span></span>
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923
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<pre style="margin: 0;">-<span id="LC923" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addDeferredBinding</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err</span> <span class="n" style="color: #333;">ct</span> <span class="c1" style="color: #998; font-style: italic;">-- Only add bindings for holes in expressions</span></span>
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924
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<pre style="margin: 0;">-<span id="LC924" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- not for holes in partial type signatures</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;">mkErrorTerm</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <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;">-- of the error term</span></span>
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928
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<pre style="margin: 0;">+<span id="LC928" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EvTerm</span></span>
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<pre style="margin: 0;">+<span id="LC929" class="line" lang="haskell"><span class="n" style="color: #333;">mkErrorTerm</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">err</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">evDelayedError</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">err_fs</span></span>
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<pre style="margin: 0;">+<span id="LC930" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC931" class="line" lang="haskell"> <span class="n" style="color: #333;">err_msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprLocErrMsg</span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;">+<span id="LC932" class="line" lang="haskell"> <span class="n" style="color: #333;">err_fs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFastString</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">showSDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">$</span></span>
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933
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<pre style="margin: 0;">+<span id="LC933" class="line" lang="haskell"> <span class="n" style="color: #333;">err_msg</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(deferred type error)"</span></span>
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934
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<pre style="margin: 0;">+<span id="LC934" class="line" lang="haskell"><span class="n" style="color: #333;">maybeAddDeferredHoleBinding</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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935
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<pre style="margin: 0;">+<span id="LC935" class="line" lang="haskell"><span class="n" style="color: #333;">maybeAddDeferredHoleBinding</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_sort</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExprHole</span> <span class="n" style="color: #333;">ev_id</span> <span class="p">})</span></span>
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936
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<pre style="margin: 0;">+<span id="LC936" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Only add bindings for holes in expressions</span></span>
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937
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<pre style="margin: 0;">+<span id="LC937" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- not for holes in partial type signatures</span></span>
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938
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- cf. addDeferredBinding</span></span>
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939
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<pre style="margin: 0;">+<span id="LC939" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">deferringAnyBindings</span> <span class="n" style="color: #333;">ctxt</span></span>
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940
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<pre style="margin: 0;">+<span id="LC940" 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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941
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<pre style="margin: 0;">+<span id="LC941" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">err_tm</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkErrorTerm</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">ev_id</span><span class="p">)</span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;">+<span id="LC942" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: idType ev_id, not hole_ty. hole_ty might be rewritten.</span></span>
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Holes] in GHC.Tc.Types.Constraint</span></span>
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944
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<pre style="margin: 0;">+<span id="LC944" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">addTcEvBind</span> <span class="p">(</span><span class="n" style="color: #333;">cec_binds</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkWantedEvBind</span> <span class="n" style="color: #333;">ev_id</span> <span class="n" style="color: #333;">err_tm</span> <span class="p">}</span></span>
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945
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<pre style="margin: 0;">+<span id="LC945" 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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946
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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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947
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<pre style="margin: 0;">+<span id="LC947" class="line" lang="haskell"><span class="n" style="color: #333;">maybeAddDeferredHoleBinding</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;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_sort</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TypeHole</span> <span class="p">})</span></span>
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948
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<pre style="margin: 0;"> <span id="LC948" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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949
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<pre style="margin: 0;"> <span id="LC949" class="line" lang="haskell"></span>
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927
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950
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<pre style="margin: 0;"> <span id="LC950" class="line" lang="haskell"><span class="n" style="color: #333;">tryReporters</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ReporterSpec</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;">Ct</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Ct</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">@@ -961,7 +984,6 @@ tryReporter ctxt (str, keep_me, suppress_after, reporter) cts</td>
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961
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984
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<pre style="margin: 0;"> <span id="LC984" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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985
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<pre style="margin: 0;"> <span id="LC985" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">yeses</span><span class="p">,</span> <span class="n" style="color: #333;">nos</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partition</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">keep_me</span> <span class="n" style="color: #333;">ct</span> <span class="p">(</span><span class="n" style="color: #333;">classifyPredType</span> <span class="p">(</span><span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span><span class="p">)))</span> <span class="n" style="color: #333;">cts</span></span>
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986
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<pre style="margin: 0;"> <span id="LC986" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC964" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC987" class="line" lang="haskell"><span class="n" style="color: #333;">pprArising</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</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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988
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<pre style="margin: 0;"> <span id="LC988" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used for the main, top-level error message</span></span>
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989
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<pre style="margin: 0;"> <span id="LC989" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We've done special processing for TypeEq, KindEq, Given</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">@@ -1104,15 +1126,16 @@ mkIrredErr ctxt cts</td>
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1104
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1126
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<pre style="margin: 0;"> <span id="LC1126" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctOrigin</span> <span class="n" style="color: #333;">ct1</span></span>
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1105
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1127
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<pre style="margin: 0;"> <span id="LC1127" class="line" lang="haskell"> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">couldNotDeduce</span> <span class="p">(</span><span class="n" style="color: #333;">getUserGivens</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">cts</span><span class="p">,</span> <span class="n" style="color: #333;">orig</span><span class="p">)</span></span>
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1106
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1128
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<pre style="margin: 0;"> <span id="LC1128" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mkErrorMsgFromCt</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ct1</span> <span class="o" style="font-weight: 600;">$</span></span>
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1107
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<pre style="margin: 0;">-<span id="LC1107" class="line" lang="haskell"> <span class="n" style="color: #333;">important</span> <span class="n" style="color: #333;">msg</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span> <span class="n" style="color: #333;">relevant_bindings</span> <span class="n" style="color: #333;">binds_msg</span> <span class="p">}</span></span>
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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;">important</span> <span class="n" style="color: #333;">msg</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span> <span class="n" style="color: #333;"><span class="idiff left right">mk_</span>relevant_bindings</span> <span class="n" style="color: #333;">binds_msg</span> <span class="p">}</span></span>
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1108
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1130
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<pre style="margin: 0;"> <span id="LC1130" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1109
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1131
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<pre style="margin: 0;"> <span id="LC1131" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ct1</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;">cts</span></span>
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1110
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1132
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<pre style="margin: 0;"> <span id="LC1132" class="line" lang="haskell"></span>
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1111
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1133
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<pre style="margin: 0;"> <span id="LC1133" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------</span></span>
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1112
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<pre style="margin: 0;">-<span id="LC1112" class="line" lang="haskell"><span class="n" style="color: #333;">mkHoleError</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</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;">mkHoleError</span> <span class="n" style="color: #333;">tidy_simples</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ct</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ</span><span class="p">,</span> <span class="n" style="color: #333;">cc_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hole_sort</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC1114" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isOutOfScopeCt</span> <span class="n" style="color: #333;">ct</span> <span class="c1" style="color: #998; font-style: italic;">-- Out of scope variables, like 'a', where 'a' isn't bound</span></span>
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<pre style="margin: 0;">-<span id="LC1115" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Suggest possible in-scope variables in the message</span></span>
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<pre style="margin: 0;">+<span id="LC1134" class="line" lang="haskell"><span class="n" style="color: #333;">mkHoleError</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span></span>
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1135
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<pre style="margin: 0;">+<span id="LC1135" class="line" lang="haskell"><span class="n" style="color: #333;">mkHoleError</span> <span class="n" style="color: #333;">_tidy_simples</span> <span class="n" style="color: #333;">_ctxt</span> <span class="n" style="color: #333;">hole</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1136" 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">
1136
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<pre style="margin: 0;">+<span id="LC1136" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hole_ty</span></span>
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1137
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<pre style="margin: 0;">+<span id="LC1137" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct_loc</span> <span class="p">})</span></span>
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1138
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<pre style="margin: 0;">+<span id="LC1138" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isOutOfScopeHole</span> <span class="n" style="color: #333;">hole</span></span>
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1116
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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="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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1117
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1140
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<pre style="margin: 0;"> <span id="LC1140" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rdr_env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getGlobalRdrEnv</span></span>
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1118
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1141
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<pre style="margin: 0;"> <span id="LC1141" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">imp_info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getImports</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1122" 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="1145" 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">@@ -1122,48 +1145,52 @@ mkHoleError tidy_simples ctxt ct@(CHoleCan { cc_occ = occ, cc_hole = hole_sort }</td>
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1122
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1145
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<pre style="margin: 0;"> <span id="LC1145" class="line" lang="haskell"> <span class="n" style="color: #333;">errDoc</span> <span class="p">[</span><span class="n" style="color: #333;">out_of_scope_msg</span><span class="p">]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1123
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1146
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<pre style="margin: 0;"> <span id="LC1146" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">unknownNameSuggestions</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">hpt</span> <span class="n" style="color: #333;">curr_mod</span> <span class="n" style="color: #333;">rdr_env</span></span>
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1124
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1147
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<pre style="margin: 0;"> <span id="LC1147" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tcl_rdr</span> <span class="n" style="color: #333;">lcl_env</span><span class="p">)</span> <span class="n" style="color: #333;">imp_info</span> <span class="p">(</span><span class="n" style="color: #333;">mkRdrUnqual</span> <span class="n" style="color: #333;">occ</span><span class="p">)]</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="kr" style="font-weight: 600;">where</span></span>
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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;">herald</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDataOcc</span> <span class="n" style="color: #333;">occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Data constructor not in scope:"</span></span>
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1150
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<pre style="margin: 0;">+<span id="LC1150" 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;">text</span> <span class="s" style="color: #d14;">"Variable not in scope:"</span></span>
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1125
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1151
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<pre style="margin: 0;"> <span id="LC1151" class="line" lang="haskell"></span>
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1126
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<pre style="margin: 0;">-<span id="LC1126" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- Explicit holes, like "_" or "_f"</span></span>
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1127
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<pre style="margin: 0;">-<span id="LC1127" 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="p">(</span><span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">binds_msg</span><span class="p">,</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">relevantBindings</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ct</span></span>
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1152
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<pre style="margin: 0;">+<span id="LC1152" class="line" lang="haskell"> <span class="n" style="color: #333;">out_of_scope_msg</span> <span class="c1" style="color: #998; font-style: italic;">-- Print v :: ty only if the type has structure</span></span>
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1153
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<pre style="margin: 0;">+<span id="LC1153" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">boring_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="n" style="color: #333;">herald</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1154" 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="n" style="color: #333;">herald</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">pp_occ_with_type</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">hole_ty</span><span class="p">)</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;">lcl_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctLocEnv</span> <span class="n" style="color: #333;">ct_loc</span></span>
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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;">boring_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTyVarTy</span> <span class="n" style="color: #333;">hole_ty</span></span>
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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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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;">-- general case: not an out-of-scope error</span></span>
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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;">mkHoleError</span> <span class="n" style="color: #333;">tidy_simples</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hole</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ</span></span>
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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;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hole_ty</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1162" 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">
1162
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<pre style="margin: 0;">+<span id="LC1162" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_sort</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sort</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1163" 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">
1163
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<pre style="margin: 0;">+<span id="LC1163" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct_loc</span> <span class="p">})</span></span>
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1164
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<pre style="margin: 0;">+<span id="LC1164" 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="p">(</span><span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">binds_msg</span><span class="p">)</span></span>
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1165
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<pre style="margin: 0;">+<span id="LC1165" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">relevant_bindings</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">lcl_env</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">hole_ty</span><span class="p">)</span></span>
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1128
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1166
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<pre style="margin: 0;"> <span id="LC1166" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The 'False' means "don't filter the bindings"; see Trac #8191</span></span>
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1129
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1167
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<pre style="margin: 0;"> <span id="LC1167" class="line" lang="haskell"></span>
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1130
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1168
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<pre style="margin: 0;"> <span id="LC1168" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">show_hole_constraints</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">goptM</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_ShowHoleConstraints</span></span>
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1131
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1169
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<pre style="margin: 0;"> <span id="LC1169" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">constraints_msg</span></span>
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1132
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<pre style="margin: 0;">-<span id="LC1132" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">isExprHoleCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">c</span>t</span><span class="p">,</span> <span class="n" style="color: #333;">show_hole_constraints</span></span>
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1170
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<pre style="margin: 0;">+<span id="LC1170" 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">ExprHole</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 right">sor</span>t</span><span class="p">,</span> <span class="n" style="color: #333;">show_hole_constraints</span></span>
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1133
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1171
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<pre style="margin: 0;"> <span id="LC1171" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">givenConstraintsMsg</span> <span class="n" style="color: #333;">ctxt</span></span>
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1134
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<td class="diff-line-num new_line" data-linenumber="1172" 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">
1172
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<pre style="margin: 0;"> <span id="LC1172" 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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1135
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<td class="diff-line-num new_line" data-linenumber="1173" 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">
1173
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<pre style="margin: 0;"> <span id="LC1173" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">empty</span></span>
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1136
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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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1137
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1175
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<pre style="margin: 0;"> <span id="LC1175" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">show_valid_hole_fits</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">goptM</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_ShowValidHoleFits</span></span>
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1138
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1176
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<pre style="margin: 0;"> <span id="LC1176" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">sub_msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">show_valid_hole_fits</span></span>
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1139
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<td class="diff-line-num new_line old" data-linenumber="1177" 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="LC1139" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">validHoleFits</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">tidy_simples</span> <span class="n" style="color: #333;"><span class="idiff left right">ct</span></span></span>
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1177
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<pre style="margin: 0;">+<span id="LC1177" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">validHoleFits</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">tidy_simples</span> <span class="n" style="color: #333;"><span class="idiff left right">hole</span></span></span>
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1140
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<td class="diff-line-num new_line" data-linenumber="1178" 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">
1178
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<pre style="margin: 0;"> <span id="LC1178" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">empty</span><span class="p">)</span></span>
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1141
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1179
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<pre style="margin: 0;"> <span id="LC1179" class="line" lang="haskell"></span>
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1142
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<pre style="margin: 0;">-<span id="LC1142" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mkError<span class="idiff left">MsgFromCt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ct</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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1180
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<pre style="margin: 0;">+<span id="LC1180" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mkError<span class="idiff left">Report</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">lcl_env</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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1143
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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;">important</span> <span class="n" style="color: #333;">hole_msg</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span></span>
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1144
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<td class="diff-line-num new_line old" data-linenumber="1182" 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="LC1144" class="line" lang="haskell"> <span class="n" style="color: #333;">relevant_bindings</span> <span class="p">(</span><span class="n" style="color: #333;">binds_msg</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">constraints_msg</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span></span>
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1182
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<pre style="margin: 0;">+<span id="LC1182" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">mk_</span>relevant_bindings</span> <span class="p">(</span><span class="n" style="color: #333;">binds_msg</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">constraints_msg</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span></span>
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1145
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1183
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<pre style="margin: 0;"> <span id="LC1183" class="line" lang="haskell"> <span class="n" style="color: #333;">valid_hole_fits</span> <span class="n" style="color: #333;">sub_msg</span> <span class="p">}</span></span>
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1146
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1184
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<pre style="margin: 0;"> <span id="LC1184" class="line" lang="haskell"></span>
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1147
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1185
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<pre style="margin: 0;"> <span id="LC1185" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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;">ct_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctLoc</span> <span class="n" style="color: #333;">ct</span></span>
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1149
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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;">lcl_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctLocEnv</span> <span class="n" style="color: #333;">ct_loc</span></span>
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1150
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<pre style="margin: 0;">-<span id="LC1150" class="line" lang="haskell"> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvPred</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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1151
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1187
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<pre style="margin: 0;"> <span id="LC1187" class="line" lang="haskell"> <span class="n" style="color: #333;">hole_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">hole_ty</span></span>
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1152
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1188
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<pre style="margin: 0;"> <span id="LC1188" class="line" lang="haskell"> <span class="n" style="color: #333;">tyvars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfTypeList</span> <span class="n" style="color: #333;">hole_ty</span></span>
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1153
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<pre style="margin: 0;">-<span id="LC1153" class="line" lang="haskell"> <span class="n" style="color: #333;">boring_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTyVarTy</span> <span class="n" style="color: #333;">hole_ty</span></span>
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1154
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<pre style="margin: 0;">-<span id="LC1154" class="line" lang="haskell"></span>
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1155
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<pre style="margin: 0;">-<span id="LC1155" class="line" lang="haskell"> <span class="n" style="color: #333;">out_of_scope_msg</span> <span class="c1" style="color: #998; font-style: italic;">-- Print v :: ty only if the type has structure</span></span>
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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;">boring_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="n" style="color: #333;">herald</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span></span>
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1157
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<pre style="margin: 0;">-<span id="LC1157" 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="n" style="color: #333;">herald</span> <span class="mi" style="color: #099;">2</span> <span class="n" style="color: #333;">pp_with_type</span></span>
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1158
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1189
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<pre style="margin: 0;"> <span id="LC1189" class="line" lang="haskell"></span>
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1159
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<td class="diff-line-num new_line old" data-linenumber="1190" 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="LC1159" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_with_type</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;">pprPrefixOcc</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprType</span> <span class="n" style="color: #333;">hole_ty</span><span class="p">)</span></span>
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1160
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<td class="diff-line-num new_line old" data-linenumber="1190" 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="LC1160" class="line" lang="haskell"> <span class="n" style="color: #333;">herald</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDataOcc</span> <span class="n" style="color: #333;">occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Data constructor not in scope:"</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1161" 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">
1161
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<td class="diff-line-num new_line old" data-linenumber="1190" 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="LC1161" 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;">text</span> <span class="s" style="color: #d14;">"Variable not in scope:"</span></span>
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1162
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<td class="diff-line-num new_line old" data-linenumber="1190" 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="LC1162" class="line" lang="haskell"></span>
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1163
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<td class="diff-line-num new_line old" data-linenumber="1190" 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="LC1163" class="line" lang="haskell"> <span class="n" style="color: #333;">hole_msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">hole_sort</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1164
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<pre style="margin: 0;">-<span id="LC1164" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ExprHole</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;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Found hole:"</span><span class="p">)</span></span>
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1165
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<pre style="margin: 0;">-<span id="LC1165" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="n" style="color: #333;">pp_with_type</span></span>
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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;">tyvars_msg</span><span class="p">,</span> <span class="n" style="color: #333;">expr_hole_hint</span> <span class="p">]</span></span>
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1190
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<pre style="margin: 0;">+<span id="LC1190" class="line" lang="haskell"> <span class="n" style="color: #333;">hole_msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">sort</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1191" 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">
1191
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<pre style="margin: 0;">+<span id="LC1191" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ExprHole</span> <span class="kr" style="font-weight: 600;">_</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;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Found hole:"</span><span class="p">)</span></span>
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1192
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<pre style="margin: 0;">+<span id="LC1192" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">pp_occ_with_type</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">hole_ty</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1193" 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">
1193
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<pre style="margin: 0;">+<span id="LC1193" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tyvars_msg</span><span class="p">,</span> <span class="n" style="color: #333;">expr_hole_hint</span> <span class="p">]</span></span>
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1167
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<td class="diff-line-num new_line" data-linenumber="1194" 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">
1194
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<pre style="margin: 0;"> <span id="LC1194" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TypeHole</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;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Found type wildcard"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">occ</span><span class="p">))</span></span>
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1168
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1195
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<pre style="margin: 0;"> <span id="LC1195" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"standing for"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="n" style="color: #333;">pp_hole_type_with_kind</span><span class="p">)</span></span>
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1169
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1196
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<pre style="margin: 0;"> <span id="LC1196" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tyvars_msg</span><span class="p">,</span> <span class="n" style="color: #333;">type_hole_hint</span> <span class="p">]</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1234" 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">@@ -1207,21 +1234,22 @@ mkHoleError tidy_simples ctxt ct@(CHoleCan { cc_occ = occ, cc_hole = hole_sort }</td>
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1207
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1234
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<pre style="margin: 0;"> <span id="LC1234" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppWhenOption</span> <span class="n" style="color: #333;">sdocPrintExplicitCoercions</span> <span class="o" style="font-weight: 600;">$</span></span>
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1208
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1235
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<pre style="margin: 0;"> <span id="LC1235" class="line" lang="haskell"> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"is a coercion variable"</span></span>
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1209
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1236
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<pre style="margin: 0;"> <span id="LC1236" class="line" lang="haskell"></span>
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1210
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<pre style="margin: 0;">-<span id="LC1210" class="line" lang="haskell"><span class="n" style="color: #333;">mkHoleError</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"mkHoleError"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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1237
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<pre style="margin: 0;">+<span id="LC1237" class="line" lang="haskell"><span class="n" style="color: #333;">pp_occ_with_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccName</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;">SDoc</span></span>
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1238
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<pre style="margin: 0;">+<span id="LC1238" class="line" lang="haskell"><span class="n" style="color: #333;">pp_occ_with_type</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">hole_ty</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;">pprPrefixOcc</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprType</span> <span class="n" style="color: #333;">hole_ty</span><span class="p">)</span></span>
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1211
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1239
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<pre style="margin: 0;"> <span id="LC1239" class="line" lang="haskell"></span>
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1212
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1240
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<pre style="margin: 0;"> <span id="LC1240" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We unwrap the ReportErrCtxt here, to avoid introducing a loop in module</span></span>
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1213
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1241
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<pre style="margin: 0;"> <span id="LC1241" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- imports</span></span>
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1214
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1242
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<pre style="margin: 0;"> <span id="LC1242" class="line" lang="haskell"><span class="n" style="color: #333;">validHoleFits</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="c1" style="color: #998; font-style: italic;">-- The context we're in, i.e. the</span></span>
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1215
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1243
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<pre style="margin: 0;"> <span id="LC1243" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- implications and the tidy environment</span></span>
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1216
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1244
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<pre style="margin: 0;"> <span id="LC1244" 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;">Ct</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Unsolved simple constraints</span></span>
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1217
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<pre style="margin: 0;">-<span id="LC1217" 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">Ct</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- The hole constraint.</span></span></span>
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1245
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<pre style="margin: 0;">+<span id="LC1245" 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">Hole</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- The hole</span></span></span>
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1218
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1246
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<pre style="margin: 0;"> <span id="LC1246" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span><span class="p">,</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;">-- We return the new context</span></span>
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1219
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1247
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<pre style="margin: 0;"> <span id="LC1247" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with a possibly updated</span></span>
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1220
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1248
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<pre style="margin: 0;"> <span id="LC1248" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tidy environment, and</span></span>
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1221
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1249
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<pre style="margin: 0;"> <span id="LC1249" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the message.</span></span>
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1222
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1250
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<pre style="margin: 0;"> <span id="LC1250" class="line" lang="haskell"><span class="n" style="color: #333;">validHoleFits</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;">CEC</span> <span class="p">{</span><span class="n" style="color: #333;">cec_encl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span></span>
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1223
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<pre style="margin: 0;">-<span id="LC1223" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cec_tidy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lcl_env</span><span class="p">})</span> <span class="n" style="color: #333;">simps</span> <span class="n" style="color: #333;"><span class="idiff left right">ct</span></span></span>
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1224
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<pre style="margin: 0;">-<span id="LC1224" 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="p">(</span><span class="n" style="color: #333;">tidy_env</span><span class="p">,</span> <span class="n" style="color: #333;">msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">findValidHoleFits</span> <span class="n" style="color: #333;">lcl_env</span> <span class="n" style="color: #333;">implics</span> <span class="n" style="color: #333;">simps</span> <span class="n" style="color: #333;"><span class="idiff left right">ct</span></span></span>
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1251
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<pre style="margin: 0;">+<span id="LC1251" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cec_tidy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lcl_env</span><span class="p">})</span> <span class="n" style="color: #333;">simps</span> <span class="n" style="color: #333;"><span class="idiff left right">hole</span></span></span>
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1252
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<pre style="margin: 0;">+<span id="LC1252" 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="p">(</span><span class="n" style="color: #333;">tidy_env</span><span class="p">,</span> <span class="n" style="color: #333;">msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">findValidHoleFits</span> <span class="n" style="color: #333;">lcl_env</span> <span class="n" style="color: #333;">implics</span> <span class="n" style="color: #333;">simps</span> <span class="n" style="color: #333;"><span class="idiff left right">hole</span></span></span>
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1225
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1253
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<pre style="margin: 0;"> <span id="LC1253" 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;">ctxt</span> <span class="p">{</span><span class="n" style="color: #333;">cec_tidy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidy_env</span><span class="p">},</span> <span class="n" style="color: #333;">msg</span><span class="p">)</span> <span class="p">}</span></span>
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1226
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1254
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<pre style="margin: 0;"> <span id="LC1254" class="line" lang="haskell"></span>
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1227
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1255
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<pre style="margin: 0;"> <span id="LC1255" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Constraints include ...]</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1283" 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">@@ -1255,7 +1283,7 @@ mkIPErr ctxt cts</td>
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1255
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1283
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<pre style="margin: 0;"> <span id="LC1283" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">couldNotDeduce</span> <span class="n" style="color: #333;">givens</span> <span class="p">(</span><span class="n" style="color: #333;">preds</span><span class="p">,</span> <span class="n" style="color: #333;">orig</span><span class="p">)</span></span>
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1256
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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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1257
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1285
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<pre style="margin: 0;"> <span id="LC1285" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mkErrorMsgFromCt</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ct1</span> <span class="o" style="font-weight: 600;">$</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;">important</span> <span class="n" style="color: #333;">msg</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span> <span class="n" style="color: #333;">relevant_bindings</span> <span class="n" style="color: #333;">binds_msg</span> <span class="p">}</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;">important</span> <span class="n" style="color: #333;">msg</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span> <span class="n" style="color: #333;"><span class="idiff left right">mk_</span>relevant_bindings</span> <span class="n" style="color: #333;">binds_msg</span> <span class="p">}</span></span>
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1259
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1287
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<pre style="margin: 0;"> <span id="LC1287" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1260
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1288
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<pre style="margin: 0;"> <span id="LC1288" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ct1</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;">cts</span></span>
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1261
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1289
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<pre style="margin: 0;"> <span id="LC1289" class="line" lang="haskell"></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="1365" 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 +1365,7 @@ mkEqErr1 ctxt ct -- Wanted or derived;</td>
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1337
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1365
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<pre style="margin: 0;"> <span id="LC1365" class="line" lang="haskell"> <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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1338
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1366
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<pre style="margin: 0;"> <span id="LC1366" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"mkEqErr1"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">pprCtOrigin</span> <span class="p">(</span><span class="n" style="color: #333;">ctOrigin</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">keep_going</span><span class="p">)</span></span>
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1339
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1367
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<pre style="margin: 0;"> <span id="LC1367" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">report</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mconcat</span> <span class="p">[</span><span class="n" style="color: #333;">important</span> <span class="n" style="color: #333;">wanted_msg</span><span class="p">,</span> <span class="n" style="color: #333;">important</span> <span class="n" style="color: #333;">coercible_msg</span><span class="p">,</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;">relevant_bindings</span> <span class="n" style="color: #333;">binds_msg</span><span class="p">]</span></span>
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1368
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<pre style="margin: 0;">+<span id="LC1368" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">mk_</span>relevant_bindings</span> <span class="n" style="color: #333;">binds_msg</span><span class="p">]</span></span>
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1341
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1369
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<pre style="margin: 0;"> <span id="LC1369" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">keep_going</span></span>
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1342
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1370
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<pre style="margin: 0;"> <span id="LC1370" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">mkEqErr_help</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">report</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">is_oriented</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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1371
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<pre style="margin: 0;"> <span id="LC1371" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">mkErrorMsgFromCt</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">report</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1541" 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">@@ -1513,7 +1541,7 @@ mkTyVarEqErr' dflags ctxt report ct oriented tv1 ty2</td>
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1513
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1541
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<pre style="margin: 0;"> <span id="LC1541" class="line" lang="haskell"> <span class="n" style="color: #333;">filter</span> <span class="n" style="color: #333;">isTyVar</span> <span class="o" style="font-weight: 600;">$</span></span>
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1514
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1542
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<pre style="margin: 0;"> <span id="LC1542" class="line" lang="haskell"> <span class="n" style="color: #333;">fvVarList</span> <span class="o" style="font-weight: 600;">$</span></span>
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1515
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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;">tyCoFVsOfType</span> <span class="n" style="color: #333;">ty1</span> <span class="p">`</span><span class="n" style="color: #333;">unionFV</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoFVsOfType</span> <span class="n" style="color: #333;">ty2</span></span>
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1516
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<pre style="margin: 0;">-<span id="LC1516" class="line" lang="haskell"> <span class="n" style="color: #333;">extra3</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">relevant_bindings</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1544" class="line" lang="haskell"> <span class="n" style="color: #333;">extra3</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">mk_</span>relevant_bindings</span> <span class="o" style="font-weight: 600;">$</span></span>
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1517
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1545
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<pre style="margin: 0;"> <span id="LC1545" class="line" lang="haskell"> <span class="n" style="color: #333;">ppWhen</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;">interesting_tyvars</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span></span>
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1518
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1546
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<pre style="margin: 0;"> <span id="LC1546" class="line" lang="haskell"> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Type variable kinds:"</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">$</span></span>
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1519
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1547
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<pre style="margin: 0;"> <span id="LC1547" class="line" lang="haskell"> <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;">tyvar_binding</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">tidyTyCoVarOcc</span> <span class="p">(</span><span class="n" style="color: #333;">cec_tidy</span> <span class="n" style="color: #333;">ctxt</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">@@ -2819,27 +2847,45 @@ relevantBindings :: Bool -- True <=> filter by tyvar; False <=> no filtering</td>
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2819
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2847
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<pre style="margin: 0;"> <span id="LC2847" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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2820
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2848
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<pre style="margin: 0;"> <span id="LC2848" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Also returns the zonked and tidied CtOrigin of the constraint</span></span>
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2821
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2849
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<pre style="margin: 0;"> <span id="LC2849" class="line" lang="haskell"><span class="n" style="color: #333;">relevantBindings</span> <span class="n" style="color: #333;">want_filtering</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC2822" 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;"><span class="idiff left">dflags</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">getDynFlags</span></span></span>
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2850
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<pre style="margin: 0;">+<span id="LC2850" 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;"><span class="idiff left">traceTc</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"relevantBindings"</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></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">ct</span></span><span class="p"><span class="idiff right">)</span></span></span>
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2823
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2851
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<pre style="margin: 0;"> <span id="LC2851" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">env1</span><span class="p">,</span> <span class="n" style="color: #333;">tidy_orig</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTidyOrigin</span> <span class="p">(</span><span class="n" style="color: #333;">cec_tidy</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">ctLocOrigin</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span></span>
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2824
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<pre style="margin: 0;">-<span id="LC2824" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ct_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfCt</span> <span class="n" style="color: #333;">ct</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">extra_tvs</span></span>
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2825
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2852
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<pre style="margin: 0;"> <span id="LC2852" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2853" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For *kind* errors, report the relevant bindings of the</span></span>
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2827
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<pre style="margin: 0;"> <span id="LC2854" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- enclosing *type* equality, because that's more useful for the programmer</span></span>
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2828
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<pre style="margin: 0;">-<span id="LC2828" class="line" lang="haskell"> <span class="idiff left right"> </span> <span class="n" style="color: #333;">extra_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tidy_orig</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2855
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<pre style="margin: 0;">+<span id="LC2855" class="line" lang="haskell"> <span class="p"><span class="idiff left">;</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">let</span></span> <span class="n" style="color: #333;">extra_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tidy_orig</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2829
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2856
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<pre style="margin: 0;"> <span id="LC2856" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">KindEqOrigin</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">m_t2</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;">tyCoVarsOfTypes</span> <span class="o" style="font-weight: 600;">$</span></span>
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2830
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2857
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<pre style="margin: 0;"> <span id="LC2857" class="line" lang="haskell"> <span class="n" style="color: #333;">t1</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">maybeToList</span> <span class="n" style="color: #333;">m_t2</span></span>
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2831
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2858
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<pre style="margin: 0;"> <span id="LC2858" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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2832
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<pre style="margin: 0;">-<span id="LC2832" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"relevantBindings"</span> <span class="o" style="font-weight: 600;">$</span></span>
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2833
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<pre style="margin: 0;">-<span id="LC2833" class="line" lang="haskell"> <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;">ct</span></span>
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2834
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<pre style="margin: 0;">-<span id="LC2834" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pprCtOrigin</span> <span class="p">(</span><span class="n" style="color: #333;">ctLocOrigin</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span></span>
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2835
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<pre style="margin: 0;">-<span id="LC2835" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct_tvs</span></span>
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<pre style="margin: 0;">+<span id="LC2859" class="line" lang="haskell"> <span class="n" style="color: #333;">ct_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfCt</span> <span class="n" style="color: #333;">ct</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">extra_tvs</span></span>
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2860
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<pre style="margin: 0;">+<span id="LC2860" class="line" lang="haskell"></span>
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2861
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<pre style="margin: 0;">+<span id="LC2861" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Put a zonked, tidied CtOrigin into the Ct</span></span>
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<pre style="margin: 0;">+<span id="LC2862" class="line" lang="haskell"> <span class="n" style="color: #333;">loc'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setCtLocOrigin</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">tidy_orig</span></span>
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2863
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<pre style="margin: 0;">+<span id="LC2863" class="line" lang="haskell"> <span class="n" style="color: #333;">ct'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setCtLoc</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">loc'</span></span>
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2864
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<pre style="margin: 0;">+<span id="LC2864" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">{</span> <span class="n" style="color: #333;">cec_tidy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env1</span> <span class="p">}</span></span>
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2865
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<pre style="margin: 0;">+<span id="LC2865" class="line" lang="haskell"></span>
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2866
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<pre style="margin: 0;">+<span id="LC2866" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt2</span><span class="p">,</span> <span class="n" style="color: #333;">doc</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">relevant_bindings</span> <span class="n" style="color: #333;">want_filtering</span> <span class="n" style="color: #333;">ctxt1</span> <span class="n" style="color: #333;">lcl_env</span> <span class="n" style="color: #333;">ct_fvs</span></span>
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2867
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<pre style="margin: 0;">+<span id="LC2867" 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;">ctxt2</span><span class="p">,</span> <span class="n" style="color: #333;">doc</span><span class="p">,</span> <span class="n" style="color: #333;">ct'</span><span class="p">)</span> <span class="p">}</span></span>
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2868
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<pre style="margin: 0;">+<span id="LC2868" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2869
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<pre style="margin: 0;">+<span id="LC2869" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctLoc</span> <span class="n" style="color: #333;">ct</span></span>
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2870
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<pre style="margin: 0;">+<span id="LC2870" class="line" lang="haskell"> <span class="n" style="color: #333;">lcl_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctLocEnv</span> <span class="n" style="color: #333;">loc</span></span>
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2871
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<pre style="margin: 0;">+<span id="LC2871" class="line" lang="haskell"></span>
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2872
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<pre style="margin: 0;">+<span id="LC2872" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- slightly more general version, to work also with holes</span></span>
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2873
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<pre style="margin: 0;">+<span id="LC2873" class="line" lang="haskell"><span class="n" style="color: #333;">relevant_bindings</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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2874
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<pre style="margin: 0;">+<span id="LC2874" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span></span>
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2875
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<pre style="margin: 0;">+<span id="LC2875" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcLclEnv</span></span>
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2876
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<pre style="margin: 0;">+<span id="LC2876" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span></span>
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2877
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<pre style="margin: 0;">+<span id="LC2877" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</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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2878
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<pre style="margin: 0;">+<span id="LC2878" class="line" lang="haskell"><span class="n" style="color: #333;">relevant_bindings</span> <span class="n" style="color: #333;">want_filtering</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">lcl_env</span> <span class="n" style="color: #333;">ct_tvs</span></span>
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2879
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<pre style="margin: 0;">+<span id="LC2879" 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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2880
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<pre style="margin: 0;">+<span id="LC2880" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"relevant_bindings"</span> <span class="o" style="font-weight: 600;">$</span></span>
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2881
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<pre style="margin: 0;">+<span id="LC2881" class="line" lang="haskell"> <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;">ct_tvs</span></span>
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2836
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2882
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<pre style="margin: 0;"> <span id="LC2882" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pprWithCommas</span> <span class="n" style="color: #333;">id</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">id</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;">id</span><span class="p">)</span></span>
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2837
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2883
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<pre style="margin: 0;"> <span id="LC2883" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TcIdBndr</span> <span class="n" style="color: #333;">id</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcl_bndrs</span> <span class="n" style="color: #333;">lcl_env</span> <span class="p">]</span></span>
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2838
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2884
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<pre style="margin: 0;"> <span id="LC2884" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pprWithCommas</span> <span class="n" style="color: #333;">id</span></span>
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2839
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2885
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<pre style="margin: 0;"> <span id="LC2885" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TcIdBndr_ExpType</span> <span class="n" style="color: #333;">id</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;">tcl_bndrs</span> <span class="n" style="color: #333;">lcl_env</span> <span class="p">]</span> <span class="p">]</span></span>
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2840
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2886
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<pre style="margin: 0;"> <span id="LC2886" class="line" lang="haskell"></span>
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2841
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2887
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<pre style="margin: 0;"> <span id="LC2887" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tidy_env'</span><span class="p">,</span> <span class="n" style="color: #333;">docs</span><span class="p">,</span> <span class="n" style="color: #333;">discards</span><span class="p">)</span></span>
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2842
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<pre style="margin: 0;">-<span id="LC2842" 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;">dflags</span> <span class="n" style="color: #333;"><span class="idiff left">env1</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ct_tvs</span></span> <span class="p">(</span><span class="n" style="color: #333;">maxRelevantBinds</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span></span>
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2888
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<pre style="margin: 0;">+<span id="LC2888" 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;">dflags</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">cec_tidy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">(</span><span class="n" style="color: #333;">maxRelevantBinds</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span></span>
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2843
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2889
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<pre style="margin: 0;"> <span id="LC2889" class="line" lang="haskell"> <span class="n" style="color: #333;">emptyVarSet</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2844
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2890
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<pre style="margin: 0;"> <span id="LC2890" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">removeBindingShadowing</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcl_bndrs</span> <span class="n" style="color: #333;">lcl_env</span><span class="p">)</span></span>
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2845
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2891
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<pre style="margin: 0;"> <span id="LC2891" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tcl_bndrs has the innermost bindings first,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2849" 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="2895" 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">@@ -2849,17 +2895,10 @@ relevantBindings want_filtering ctxt ct</td>
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2849
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2895
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<pre style="margin: 0;"> <span id="LC2895" class="line" lang="haskell"> <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;">"Relevant bindings include"</span><span class="p">)</span></span>
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2850
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2896
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<pre style="margin: 0;"> <span id="LC2896" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="n" style="color: #333;">docs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppWhen</span> <span class="n" style="color: #333;">discards</span> <span class="n" style="color: #333;">discardMsg</span><span class="p">)</span></span>
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2851
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2897
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<pre style="margin: 0;"> <span id="LC2897" class="line" lang="haskell"></span>
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2852
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<pre style="margin: 0;">-<span id="LC2852" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Put a zonked, tidied CtOrigin into the Ct</span></span>
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2853
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<pre style="margin: 0;">-<span id="LC2853" class="line" lang="haskell"> <span class="n" style="color: #333;">loc'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setCtLocOrigin</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">tidy_orig</span></span>
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2854
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<pre style="margin: 0;">-<span id="LC2854" class="line" lang="haskell"> <span class="n" style="color: #333;">ct'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setCtLoc</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">loc'</span></span>
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2855
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2898
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<pre style="margin: 0;"> <span id="LC2898" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">{</span> <span class="n" style="color: #333;">cec_tidy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidy_env'</span> <span class="p">}</span></span>
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2856
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2899
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<pre style="margin: 0;"> <span id="LC2899" class="line" lang="haskell"></span>
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2857
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<pre style="margin: 0;">-<span id="LC2857" 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;">ctxt'</span><span class="p">,</span> <span class="n" style="color: #333;">doc</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ct'</span></span><span class="p">)</span> <span class="p">}</span></span>
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2900
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<pre style="margin: 0;">+<span id="LC2900" 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;">ctxt'</span><span class="p">,</span> <span class="n" style="color: #333;">doc</span><span class="p">)</span> <span class="p">}</span></span>
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2858
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2901
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<pre style="margin: 0;"> <span id="LC2901" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2859
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<pre style="margin: 0;">-<span id="LC2859" class="line" lang="haskell"> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span></span>
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2860
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<pre style="margin: 0;">-<span id="LC2860" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span></span>
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2861
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<pre style="margin: 0;">-<span id="LC2861" class="line" lang="haskell"> <span class="n" style="color: #333;">lcl_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctLocEnv</span> <span class="n" style="color: #333;">loc</span></span>
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2862
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<pre style="margin: 0;">-<span id="LC2862" class="line" lang="haskell"></span>
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2863
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2902
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<pre style="margin: 0;"> <span id="LC2902" class="line" lang="haskell"> <span class="n" style="color: #333;">run_out</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;">Int</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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2864
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2903
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<pre style="margin: 0;"> <span id="LC2903" class="line" lang="haskell"> <span class="n" style="color: #333;">run_out</span> <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;">False</span></span>
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2865
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2904
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<pre style="margin: 0;"> <span id="LC2904" class="line" lang="haskell"> <span class="n" style="color: #333;">run_out</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">0</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2907" 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">@@ -2868,14 +2907,14 @@ relevantBindings want_filtering ctxt ct</td>
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2868
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2907
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<pre style="margin: 0;"> <span id="LC2907" class="line" lang="haskell"> <span class="n" style="color: #333;">dec_max</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fmap</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span></span>
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2869
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2908
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<pre style="margin: 0;"> <span id="LC2908" class="line" lang="haskell"></span>
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2870
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2909
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<pre style="margin: 0;"> <span id="LC2909" class="line" lang="haskell"></span>
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2871
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<td class="diff-line-num new_line old" data-linenumber="2910" 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="LC2871" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TcTyVarSet</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">Maybe</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;">TcTyVarSet</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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2910
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<pre style="margin: 0;">+<span id="LC2910" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</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;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVarSet</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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2872
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2911
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<pre style="margin: 0;"> <span id="LC2911" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True <=> some filtered out due to lack of fuel</span></span>
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2873
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2912
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<pre style="margin: 0;"> <span id="LC2912" 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;">TcBinder</span><span class="p">]</span></span>
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2874
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2913
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<pre style="margin: 0;"> <span id="LC2913" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TidyEnv</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="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- The bool says if we filtered any out</span></span>
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2875
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2914
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<pre style="margin: 0;"> <span id="LC2914" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because of lack of fuel</span></span>
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2876
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<pre style="margin: 0;">-<span id="LC2876" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tidy_env</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 class="idiff left">_</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">docs</span> <span class="n" style="color: #333;">discards</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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2915
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<pre style="margin: 0;">+<span id="LC2915" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tidy_env</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">docs</span> <span class="n" style="color: #333;">discards</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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2877
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2916
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<pre style="margin: 0;"> <span id="LC2916" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">tidy_env</span><span class="p">,</span> <span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">docs</span><span class="p">,</span> <span class="n" style="color: #333;">discards</span><span class="p">)</span></span>
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2878
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<td class="diff-line-num new_line old" data-linenumber="2917" 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="LC2878" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;"><span class="idiff left">ct_tvs</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">n_left</span> <span class="n" style="color: #333;">tvs_seen</span> <span class="n" style="color: #333;">docs</span> <span class="n" style="color: #333;">discards</span> <span class="p">(</span><span class="n" style="color: #333;">tc_bndr</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">tc_bndrs</span><span class="p">)</span></span>
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2917
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<pre style="margin: 0;">+<span id="LC2917" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;">n_left</span> <span class="n" style="color: #333;">tvs_seen</span> <span class="n" style="color: #333;">docs</span> <span class="n" style="color: #333;">discards</span> <span class="p">(</span><span class="n" style="color: #333;">tc_bndr</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">tc_bndrs</span><span class="p">)</span></span>
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2879
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<td class="diff-line-num new_line" data-linenumber="2918" 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">
2918
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<pre style="margin: 0;"> <span id="LC2918" 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;">tc_bndr</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2880
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2919
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<pre style="margin: 0;"> <span id="LC2919" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TcTvBndr</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">discard_it</span></span>
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2881
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2920
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<pre style="margin: 0;"> <span id="LC2920" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TcIdBndr</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">top_lvl</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go2</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="n" style="color: #333;">top_lvl</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">@@ -2891,7 +2930,7 @@ relevantBindings want_filtering ctxt ct</td>
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2891
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2930
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<pre style="margin: 0;"> <span id="LC2930" 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;">discard_it</span> <span class="c1" style="color: #998; font-style: italic;">-- No info; discard</span></span>
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2892
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2931
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<pre style="margin: 0;"> <span id="LC2931" class="line" lang="haskell"> <span class="p">}</span></span>
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2893
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2932
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<pre style="margin: 0;"> <span id="LC2932" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2894
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<pre style="margin: 0;">-<span id="LC2894" class="line" lang="haskell"> <span class="n" style="color: #333;">discard_it</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;"><span class="idiff left">ct_tvs</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">n_left</span> <span class="n" style="color: #333;">tvs_seen</span> <span class="n" style="color: #333;">docs</span></span>
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2933
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<pre style="margin: 0;">+<span id="LC2933" class="line" lang="haskell"> <span class="n" style="color: #333;">discard_it</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;">n_left</span> <span class="n" style="color: #333;">tvs_seen</span> <span class="n" style="color: #333;">docs</span></span>
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2895
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2934
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<pre style="margin: 0;"> <span id="LC2934" class="line" lang="haskell"> <span class="n" style="color: #333;">discards</span> <span class="n" style="color: #333;">tc_bndrs</span></span>
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2896
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2935
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<pre style="margin: 0;"> <span id="LC2935" class="line" lang="haskell"> <span class="n" style="color: #333;">go2</span> <span class="n" style="color: #333;">id_name</span> <span class="n" style="color: #333;">id_type</span> <span class="n" style="color: #333;">top_lvl</span></span>
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2897
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2936
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<pre style="margin: 0;"> <span id="LC2936" 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="p">(</span><span class="n" style="color: #333;">tidy_env'</span><span class="p">,</span> <span class="n" style="color: #333;">tidy_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTidyTcType</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;">id_type</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2916" 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="2955" 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">@@ -2916,12 +2955,12 @@ relevantBindings want_filtering ctxt ct</td>
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2916
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2955
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<pre style="margin: 0;"> <span id="LC2955" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">run_out</span> <span class="n" style="color: #333;">n_left</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">id_tvs</span> <span class="p">`</span><span class="n" style="color: #333;">subVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tvs_seen</span></span>
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2917
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2956
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<pre style="margin: 0;"> <span id="LC2956" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We've run out of n_left fuel and this binding only</span></span>
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2918
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2957
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<pre style="margin: 0;"> <span id="LC2957" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- mentions already-seen type variables, so discard it</span></span>
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2919
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<pre style="margin: 0;">-<span id="LC2919" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;"><span class="idiff left">ct_tvs</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">n_left</span> <span class="n" style="color: #333;">tvs_seen</span> <span class="n" style="color: #333;">docs</span></span>
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2958
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<pre style="margin: 0;">+<span id="LC2958" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;">n_left</span> <span class="n" style="color: #333;">tvs_seen</span> <span class="n" style="color: #333;">docs</span></span>
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2920
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2959
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<pre style="margin: 0;"> <span id="LC2959" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- Record that we have now discarded something</span></span>
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2921
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2960
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<pre style="margin: 0;"> <span id="LC2960" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_bndrs</span></span>
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2922
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2961
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<pre style="margin: 0;"> <span id="LC2961" class="line" lang="haskell"></span>
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2923
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2962
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<pre style="margin: 0;"> <span id="LC2962" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Keep this binding, decrement fuel</span></span>
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2924
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<pre style="margin: 0;">-<span id="LC2924" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tidy_env'</span> <span class="n" style="color: #333;"><span class="idiff left">ct_tvs</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">dec_max</span> <span class="n" style="color: #333;">n_left</span><span class="p">)</span> <span class="n" style="color: #333;">new_seen</span></span>
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2963
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<pre style="margin: 0;">+<span id="LC2963" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tidy_env'</span> <span class="p">(</span><span class="n" style="color: #333;">dec_max</span> <span class="n" style="color: #333;">n_left</span><span class="p">)</span> <span class="n" style="color: #333;">new_seen</span></span>
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<pre style="margin: 0;"> <span id="LC2964" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">doc</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">docs</span><span class="p">)</span> <span class="n" style="color: #333;">discards</span> <span class="n" style="color: #333;">tc_bndrs</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2965" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2966" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#897218b3e24728ae9e5b0329b949493f1ede80fb"><strong>compiler/GHC/Tc/Errors/Hole.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">@@ -2,17 +2,9 @@</td>
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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 ExistentialQuantification #-}</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;">{-# OPTIONS_GHC -Wno-incomplete-record-updates #-}</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Tc.Errors.Hole</span></span>
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5
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="haskell"> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">findValidHoleFits</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcFilterHoleFits</span></span>
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6
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcCheckHoleFit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSubsumes</span></span>
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7
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">withoutUnification</span></span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">fromPureHFPlugin</span></span>
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9
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Re-exports for convenience</span></span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hfIsLcl</span></span>
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11
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprHoleFit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">debugHoleFitDispConfig</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">findValidHoleFits</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"></span>
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13
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Re-exported from GHC.Tc.Errors.Hole.FitTypes</span></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TypedHole</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;">HoleFit</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;">HoleFitCandidate</span> <span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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15
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CandPlugin</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FitPlugin</span></span>
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16
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8
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HoleFitPlugin</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;">HoleFitPluginR</span> <span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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17
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9
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC10" 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">@@ -121,7 +113,7 @@ The hole in `f` would generate the message:</td>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Valid hole fits are found by checking top level identifiers and local bindings</span></span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in scope for whether their type can be instantiated to the the type of the hole.</span></span>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Additionally, we also need to check whether all relevant constraints are solved</span></span>
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<pre style="margin: 0;">-<span id="LC124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by choosing an identifier of that type as well, see Note [Relevant <span class="idiff left right">C</span>onstraints]</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by choosing an identifier of that type as well, see Note [Relevant <span class="idiff left right">c</span>onstraints]</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="cm" style="color: #998; font-style: italic;">Since checking for subsumption results in the side-effect of type variables</span></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">being unified by the simplifier, we need to take care to restore them after</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">@@ -143,9 +135,13 @@ that the quantified type variables would take if that fit is used, like</td>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If -XTypeApplications is enabled, this can even be copied verbatim as a</span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">replacement for the hole.</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="LC146" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC147" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Nested implications]</span></span>
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<pre style="margin: 0;">-<span id="LC148" 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="LC138" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Checking hole fits]</span></span>
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<pre style="margin: 0;">+<span id="LC139" 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="LC140" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we have a hole of type hole_ty, we want to know whether a variable</span></span>
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of type ty is a valid fit for the whole. This is a subsumption check:</span></span>
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we wish to know whether ty <: hole_ty. But, of course, the check</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">must take into account any givens and relevant constraints.</span></span>
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(See also Note [Relevant constraints]).</span></span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For the simplifier to be able to use any givens present in the enclosing</span></span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">implications to solve relevant constraints, we nest the wanted subsumption</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">@@ -156,10 +152,7 @@ As an example, let's look at the following code:</td>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: Show a => a -> String</span></span>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x = show _</span></span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The hole will result in the hole constraint:</span></span>
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<pre style="margin: 0;">-<span id="LC160" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC161" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [WD] __a1ph {0}:: a0_a1pd[tau:2] (CHoleCan: ExprHole(_))</span></span>
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<pre style="margin: 0;">-<span id="LC162" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose the hole is assigned type a0_a1pd[tau:2].</span></span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here the nested implications are just one level deep, namely:</span></span>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [Implic {</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">@@ -170,36 +163,25 @@ Here the nested implications are just one level deep, namely:</td>
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Given = $dShow_a1pc :: Show a_a1pa[sk:2]</span></span>
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Wanted =</span></span>
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> WC {wc_simple =</span></span>
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [WD] __a1ph {0}:: a_a1pd[tau:2] (CHoleCan: ExprHole(_))</span></span>
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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [WD] $dShow_a1pe {0}:: Show a_a1pd[tau:2] (CDictCan(psc))}</span></span>
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [WD] $dShow_a1pe {0}:: Show a0_a1pd[tau:2] (CDictCan(psc))}</span></span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Binds = EvBindsVar<a1pi></span></span>
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Needed inner = []</span></span>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Needed outer = []</span></span>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the type signature for:</span></span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: forall a. Show a => a -> String }]</span></span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC181" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As we can see, the givens say that the <span class="idiff left right">information about the </span>skolem</span></span>
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`a_a1pa[sk:2]` fulfills the Show constraint<span class="idiff left right">.</span></span></span>
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<pre style="margin: 0;">-<span id="LC183" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">The simples are:</span></span></span>
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173
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As we can see, the givens say that the skolem</span></span>
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174
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`a_a1pa[sk:2]` fulfills the Show constraint<span class="idiff left right">, and that we must prove</span></span></span>
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the [W] Show a0_a1pd[tau:2] constraint -- that is, whatever fills the</span></span>
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176
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">hole must have a Show instance.</span></span></span>
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185
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177
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"></span>
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186
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<pre style="margin: 0;">-<span id="LC186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [[WD] __a1ph {0}:: a0_a1pd[tau:2] (CHoleCan: ExprHole(_)),</span></span>
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187
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [WD] $dShow_a1pe {0}:: Show a0_a1pd[tau:2] (CNonCanonical)]</span></span>
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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">I.e. the hole `a0_a1pd[tau:2]` and the constraint that the type of the hole must</span></span>
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190
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fulfill `Show a0_a1pd[tau:2])`.</span></span>
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191
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<pre style="margin: 0;">-<span id="LC191" class="line" lang="haskell"></span>
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192
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So when we run the check, we need to make sure that the</span></span>
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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"></span>
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194
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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [WD] $dShow_a1pe {0}:: Show a0_a1pd[tau:2] (CNonCanonical)</span></span>
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195
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"></span>
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196
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Constraint gets solved. When we now check for whether `x :: a0_a1pd[tau:2]` fits</span></span>
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197
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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the hole in `tcCheckHoleFit`, the call to `tcSubType` will end up writing the</span></span>
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198
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<pre style="margin: 0;">-<span id="LC198" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">meta type variable `a0_a1pd[tau:2] := a_a1pa[sk:2]`. By wrapping the wanted</span></span>
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199
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constraints needed by tcSubType_NC and the relevant constraints (see</span></span>
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Relevant Constraints] for more details) in the nested implications, we</span></span>
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<pre style="margin: 0;">-<span id="LC201" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">can pass the information in the givens along to the simplifier. For our example,</span></span>
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we end up needing to check whether the following constraints are soluble.</span></span>
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we now check whether `x :: a_a1pa[sk:2]` fits the hole in</span></span>
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`tcCheckHoleFit`, the call to `tcSubType` will end up unifying the meta type</span></span>
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variable `a0_a1pd[tau:2] := a_a1pa[sk:2]`. By wrapping the wanted constraints</span></span>
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">needed by tcSubType_NC and the relevant constraints (see Note [Relevant</span></span>
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Constraints] for more details) in the nested implications, we can pass the</span></span>
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">information in the givens along to the simplifier. For our example, we end up</span></span>
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184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">needing to check whether the following constraints are soluble.</span></span>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> WC {wc_impl =</span></span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Implic {</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">@@ -223,10 +205,12 @@ with a final WC of WC {}, confirming x :: a0_a1pd[tau:2] as a match.</td>
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To avoid side-effects on the nested implications, we create a new EvBindsVar so</span></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;">that any changes to the ev binds during a check remains localised to that check.</span></span>
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<pre style="margin: 0;">-<span id="LC226" class="line" lang="haskell"></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;">In addition, we call withoutUnification to reset any unified metavariables; this</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;">call is actually done outside tcCheckHoleFit so that the results can be formatted</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;">for the user before resetting variables.</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="cm" style="color: #998; font-style: italic;">Note [Valid refinement hole fits include ...]</span></span>
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<pre style="margin: 0;">-<span id="LC229" 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="LC213" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<span class="idiff left right">~~~~~~~</span></span></span>
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<pre style="margin: 0;"> <span id="LC214" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When the `-frefinement-level-hole-fits=N` flag is given, we additionally look</span></span>
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for "valid refinement hole fits"", i.e. valid hole fits with up to N</span></span>
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">additional holes in them.</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">@@ -337,10 +321,8 @@ In the free monad example above, this is demonstrated with</td>
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<pre style="margin: 0;"> <span id="LC321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be applied to an expression of type `a -> Free f b` in order to match.</span></span>
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<pre style="margin: 0;"> <span id="LC322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If -XScopedTypeVariables is enabled, this hole fit can even be copied verbatim.</span></span>
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC340" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Relevant Constraints]</span></span>
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<pre style="margin: 0;">-<span id="LC342" 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="LC343" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Relevant constraints]</span></span>
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<pre style="margin: 0;">+<span id="LC325" 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="LC326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As highlighted by #14273, we need to check any relevant constraints as well</span></span>
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<pre style="margin: 0;"> <span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">as checking for subsumption. Relevant constraints are the simple constraints</span></span>
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">whose free unification variables are mentioned in the type of the hole.</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">@@ -351,10 +333,9 @@ as is the case in</td>
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: String</span></span>
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = show _</span></span>
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<pre style="margin: 0;"> <span id="LC335" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Where the simples will be </span>:</span></span>
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Here, the hole is given type a0_a1kv[tau:1]. Then, the emitted constraint is</span>:</span></span>
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<pre style="margin: 0;"> <span id="LC337" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [[WD] __a1kz {0}:: a0_a1kv[tau:1] (CHoleCan: ExprHole(_)),</span></span>
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<pre style="margin: 0;">-<span id="LC357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [WD] $dShow_a1kw {0}:: Show a0_a1kv[tau:1] (CNonCanonical)]</span></span>
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [WD] $dShow_a1kw {0}:: Show a0_a1kv[tau:1] (CNonCanonical)</span></span>
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<pre style="margin: 0;"> <span id="LC339" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, when there are multiple holes, we need to be more careful. As an</span></span>
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<pre style="margin: 0;"> <span id="LC341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example, Let's take a look at the following code:</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">@@ -362,29 +343,24 @@ example, Let's take a look at the following code:</td>
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<pre style="margin: 0;"> <span id="LC343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: Show a => a -> String</span></span>
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<pre style="margin: 0;"> <span id="LC344" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x = show (_b (show _a))</span></span>
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<pre style="margin: 0;"> <span id="LC345" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here there are two holes, `_a` and `_b`, and the simple constraints passed to</span></span>
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here there are two holes, `_a` and `_b`. Suppose _a :: a0_a1pd[tau:2] and</span></span>
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">_b :: a1_a1po[tau:2]. Then, the simple constraints passed to</span></span>
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<pre style="margin: 0;"> <span id="LC348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">findValidHoleFits are:</span></span>
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<pre style="margin: 0;"> <span id="LC349" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [[WD] _a_a1pi {0}:: String</span></span>
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<pre style="margin: 0;">-<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> a0_a1pd[tau:2] (CHoleCan: ExprHole(_b)),</span></span>
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<pre style="margin: 0;">-<span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [WD] _b_a1ps {0}:: a1_a1po[tau:2] (CHoleCan: ExprHole(_a)),</span></span>
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<pre style="margin: 0;">-<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [WD] $dShow_a1pe {0}:: Show a0_a1pd[tau:2] (CNonCanonical),</span></span>
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [[WD] $dShow_a1pe {0}:: Show a0_a1pd[tau:2] (CNonCanonical),</span></span>
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<pre style="margin: 0;"> <span id="LC351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [WD] $dShow_a1pp {0}:: Show a1_a1po[tau:2] (CNonCanonical)]</span></span>
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<pre style="margin: 0;"> <span id="LC352" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here we have the two hole constraints for `_a` and `_b`, but also additional</span></span>
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<pre style="margin: 0;">-<span id="LC376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constraints that these holes must fulfill. When we are looking for a match for</span></span>
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the hole `_a`, we filter the simple constraints to the "Relevant constraints",</span></span>
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<pre style="margin: 0;">-<span id="LC378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by throwing out all hole constraints and any constraints which do not mention</span></span>
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<pre style="margin: 0;">-<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a variable mentioned in the type of the hole. For hole `_a`, we will then</span></span>
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<pre style="margin: 0;">-<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">only require that the `$dShow_a1pp` constraint is solved, since that is</span></span>
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the only non-hole constraint that mentions any free type variables mentioned in</span></span>
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<pre style="margin: 0;">-<span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the hole constraint for `_a`, namely `a_a1pd[tau:2]` , and similarly for the</span></span>
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<pre style="margin: 0;">-<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">hole `_b` we only require that the `$dShow_a1pe` constraint is solved.</span></span>
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we are looking for a match for the hole `_a`, we filter the simple</span></span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constraints to the "Relevant constraints", by throwing out any constraints</span></span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which do not mention a variable mentioned in the type of the hole. For hole</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`_a`, we will then only require that the `$dShow_a1pe` constraint is solved,</span></span>
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">since that is the only constraint that mentions any free type variables</span></span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">mentioned in the hole constraint for `_a`, namely `a_a1pd[tau:2]`, and</span></span>
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">similarly for the hole `_b` we only require that the `$dShow_a1pe` constraint</span></span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is solved.</span></span>
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="haskell"></span>
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362
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<pre style="margin: 0;"> <span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Leaking errors]</span></span>
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386
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<pre style="margin: 0;">-<span id="LC386" 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="LC387" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC363" 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="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When considering candidates, GHC believes that we're checking for validity in</span></span>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">actual source. However, As evidenced by #15321, #15007 and #15202, this can</span></span>
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<pre style="margin: 0;"> <span id="LC366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">cause bewildering error messages. The solution here is simple: if a candidate</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">@@ -393,17 +369,12 @@ is discarded.</td>
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<pre style="margin: 0;"> <span id="LC369" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC370" 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="LC371" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC396" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HoleFitDispConfig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HFDC</span> <span class="p">{</span> <span class="n" style="color: #333;">showWrap</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="LC373" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">showWrapVars</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="LC374" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">showType</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="LC375" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">showProv</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="LC376" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">showMatches</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="LC377" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC403" class="line" lang="haskell"><span class="n" style="color: #333;">debugHoleFitDispConfig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HoleFitDispConfig</span></span>
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<pre style="margin: 0;">-<span id="LC404" class="line" lang="haskell"><span class="n" style="color: #333;">debugHoleFitDispConfig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HFDC</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="kt" style="color: #458; font-weight: 600;">False</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>
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<pre style="margin: 0;"> <span id="LC378" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We read the various -no-show-*-of-hole-fits flags</span></span>
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<pre style="margin: 0;"> <span id="LC379" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and set the display config accordingly.</span></span>
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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell"><span class="n" style="color: #333;">getHoleFitDispConfig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">HoleFitDispConfig</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="516" 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="487" 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">@@ -516,13 +487,12 @@ pprHoleFit (HFDC sWrp sWrpVars sTy sProv sMs) (HoleFit {..}) =</td>
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<pre style="margin: 0;"> <span id="LC487" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GreHFCand</span> <span class="n" style="color: #333;">gre</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprNameProvenance</span> <span class="n" style="color: #333;">gre</span></span>
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<pre style="margin: 0;"> <span id="LC488" 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;">text</span> <span class="s" style="color: #d14;">"bound at"</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;">getSrcLoc</span> <span class="n" style="color: #333;">name</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC489" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC519" class="line" lang="haskell"><span class="n" style="color: #333;">getLocalBindings</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</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="LC520" class="line" lang="haskell"><span class="n" style="color: #333;">getLocalBindings</span> <span class="n" style="color: #333;">tidy_orig</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC521" 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="p">(</span><span class="n" style="color: #333;">env1</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;">zonkTidyOrigin</span> <span class="n" style="color: #333;">tidy_orig</span> <span class="p">(</span><span class="n" style="color: #333;">ctLocOrigin</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC490" class="line" lang="haskell"><span class="n" style="color: #333;">getLocalBindings</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct<span class="idiff left right">Loc</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</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="LC491" class="line" lang="haskell"><span class="n" style="color: #333;">getLocalBindings</span> <span class="n" style="color: #333;">tidy_orig</span> <span class="n" style="color: #333;">ct<span class="idiff left right">_loc</span></span></span>
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<pre style="margin: 0;">+<span id="LC492" 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="p">(</span><span class="n" style="color: #333;">env1</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;">zonkTidyOrigin</span> <span class="n" style="color: #333;">tidy_orig</span> <span class="p">(</span><span class="n" style="color: #333;">ctLocOrigin</span> <span class="n" style="color: #333;"><span class="idiff left right">ct_</span>loc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC493" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">env1</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">(</span><span class="n" style="color: #333;">removeBindingShadowing</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcl_bndrs</span> <span class="n" style="color: #333;">lcl_env</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC494" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC524" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvLoc</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC525" class="line" lang="haskell"> <span class="n" style="color: #333;">lcl_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctLocEnv</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;">+<span id="LC495" class="line" lang="haskell"> <span class="n" style="color: #333;">lcl_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctLocEnv</span> <span class="n" style="color: #333;">ct_loc</span></span>
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<pre style="margin: 0;"> <span id="LC496" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcBinder</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</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="LC498" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">sofar</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;">return</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">sofar</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">@@ -542,11 +512,13 @@ findValidHoleFits :: TidyEnv -- ^ The tidy_env for zonking</td>
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<pre style="margin: 0;"> <span id="LC512" 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;">Ct</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC513" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The unsolved simple constraints in the implication for</span></span>
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514
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<pre style="margin: 0;"> <span id="LC514" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the hole.</span></span>
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<pre style="margin: 0;">-<span id="LC545" 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">Ct</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- ^ The hole constraint itself</span></span></span>
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<pre style="margin: 0;">+<span id="LC515" 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">Hole</span></span></span>
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<pre style="margin: 0;"> <span id="LC516" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TidyEnv</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="LC547" class="line" lang="haskell"><span class="n" style="color: #333;">findValidHoleFits</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;">implics</span> <span class="n" style="color: #333;">simples</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isExprHoleCt</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC517" class="line" lang="haskell"><span class="n" style="color: #333;">findValidHoleFits</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;">implics</span> <span class="n" style="color: #333;">simples</span> <span class="n" style="color: #333;">h</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_sort</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExprHole</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<pre style="margin: 0;">+<span id="LC518" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct_loc</span></span>
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<pre style="margin: 0;">+<span id="LC519" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hole_ty</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC520" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">rdr_env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getGlobalRdrEnv</span></span>
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<pre style="margin: 0;">-<span id="LC549" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lclBinds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLocalBindings</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lclBinds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLocalBindings</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;">ct<span class="idiff left right">_loc</span></span></span>
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<pre style="margin: 0;"> <span id="LC522" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">maxVSubs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">maxValidHoleFits</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC523" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">hfdc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getHoleFitDispConfig</span></span>
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<pre style="margin: 0;"> <span id="LC524" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">sortingAlg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getSortingAlg</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -554,7 +526,9 @@ findValidHoleFits tidy_env implics simples ct | isExprHoleCt ct =</td>
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526
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">hfPlugs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcg_hf_plugins</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getGblEnv</span></span>
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527
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<pre style="margin: 0;"> <span id="LC527" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">findVLimit</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">sortingAlg</span> <span class="o" style="font-weight: 600;">></span> <span class="kt" style="color: #458; font-weight: 600;">NoSorting</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">maxVSubs</span></span>
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<pre style="margin: 0;"> <span id="LC528" class="line" lang="haskell"> <span class="n" style="color: #333;">refLevel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">refLevelHoleFits</span> <span class="n" style="color: #333;">dflags</span></span>
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<pre style="margin: 0;">-<span id="LC557" class="line" lang="haskell"> <span class="n" style="color: #333;">hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyH</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">relevantCts</span><span class="p">)</span> <span class="n" style="color: #333;">implics</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="haskell"> <span class="n" style="color: #333;">hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TypedHole</span> <span class="p">{</span> <span class="n" style="color: #333;">th_relevant_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">relevantCts</span></span>
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">th_implics</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span></span>
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">th_hole</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;">h</span> <span class="p">}</span></span>
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558
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532
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<pre style="margin: 0;"> <span id="LC532" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">candidatePlugins</span><span class="p">,</span> <span class="n" style="color: #333;">fitPlugins</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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559
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533
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<pre style="margin: 0;"> <span id="LC533" class="line" lang="haskell"> <span class="n" style="color: #333;">unzip</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">p</span><span class="o" style="font-weight: 600;">-></span> <span class="p">((</span><span class="n" style="color: #333;">candPlugin</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="n" style="color: #333;">hole</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">fitPlugin</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="n" style="color: #333;">hole</span><span class="p">))</span> <span class="n" style="color: #333;">hfPlugs</span></span>
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560
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534
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<pre style="margin: 0;"> <span id="LC534" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"findingValidHoleFitsFor { "</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hole</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="625" 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="599" 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">@@ -625,11 +599,9 @@ findValidHoleFits tidy_env implics simples ct | isExprHoleCt ct =</td>
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<pre style="margin: 0;"> <span id="LC599" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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;">-- We extract the type, the tcLevel and the types free variables</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;">-- from from the constraint.</span></span>
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<pre style="margin: 0;">-<span id="LC628" class="line" lang="haskell"> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span></span>
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<pre style="margin: 0;">-<span id="LC629" class="line" lang="haskell"> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"> <span class="n" style="color: #333;">hole_fvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FV</span></span>
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<pre style="margin: 0;"> <span id="LC603" class="line" lang="haskell"> <span class="n" style="color: #333;">hole_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoFVsOfType</span> <span class="n" style="color: #333;">hole_ty</span></span>
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<pre style="margin: 0;">-<span id="LC632" class="line" lang="haskell"> <span class="n" style="color: #333;">hole_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctLocLevel</span> <span class="o" style="font-weight: 600;"><span class="idiff left">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctEvLoc</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctEvidence</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ct</span></span></span>
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"> <span class="n" style="color: #333;">hole_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctLocLevel</span> <span class="n" style="color: #333;"><span class="idiff left right">ct_loc</span></span></span>
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<pre style="margin: 0;"> <span id="LC605" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC606" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- BuiltInSyntax names like (:) and []</span></span>
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<pre style="margin: 0;"> <span id="LC607" class="line" lang="haskell"> <span class="n" style="color: #333;">builtIns</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</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">@@ -668,7 +640,7 @@ findValidHoleFits tidy_env implics simples ct | isExprHoleCt ct =</td>
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><*></span> <span class="n" style="color: #333;">sortByGraph</span> <span class="p">(</span><span class="n" style="color: #333;">sort</span> <span class="n" style="color: #333;">gblFits</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC641" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="p">(</span><span class="n" style="color: #333;">lclFits</span><span class="p">,</span> <span class="n" style="color: #333;">gblFits</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">span</span> <span class="n" style="color: #333;">hfIsLcl</span> <span class="n" style="color: #333;">subs</span></span>
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<pre style="margin: 0;"> <span id="LC642" class="line" lang="haskell"></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;">-- See Note [Relevant <span class="idiff left right">C</span>onstraints]</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;">-- See Note [Relevant <span class="idiff left right">c</span>onstraints]</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell"> <span class="n" style="color: #333;">relevantCts</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC645" class="line" lang="haskell"> <span class="n" style="color: #333;">relevantCts</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isEmptyVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">fvVarSet</span> <span class="n" style="color: #333;">hole_fvs</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC646" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">filter</span> <span class="n" style="color: #333;">isRelevant</span> <span class="n" style="color: #333;">simples</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">@@ -684,7 +656,6 @@ findValidHoleFits tidy_env implics simples ct | isExprHoleCt ct =</td>
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<pre style="margin: 0;"> <span id="LC656" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- trying to find hole fits for many holes at once.</span></span>
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<pre style="margin: 0;"> <span id="LC657" class="line" lang="haskell"> <span class="n" style="color: #333;">isRelevant</span> <span class="n" style="color: #333;">ct</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;">isEmptyVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">ctFreeVarSet</span> <span class="n" style="color: #333;">ct</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC658" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">anyFVMentioned</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC687" class="line" lang="haskell"> <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;">isHoleCt</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC660" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We zonk the hole fits so that the output aligns with the rest</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;">-- of the typed hole error message output.</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">@@ -761,7 +732,7 @@ tcFilterHoleFits :: Maybe Int</td>
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<pre style="margin: 0;"> <span id="LC732" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ We return whether or not we stopped due to hitting the limit</span></span>
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<pre style="margin: 0;"> <span id="LC733" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and the fits we found.</span></span>
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<pre style="margin: 0;"> <span id="LC734" class="line" lang="haskell"><span class="n" style="color: #333;">tcFilterHoleFits</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="mi" style="color: #099;">0</span><span class="p">)</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;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Stop right away on 0</span></span>
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764
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<pre style="margin: 0;">-<span id="LC764" class="line" lang="haskell"><span class="n" style="color: #333;">tcFilterHoleFits</span> <span class="n" style="color: #333;">limit</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TyH</span></span><span class="idiff"> </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 right">})</span></span> <span class="n" style="color: #333;">ht</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">hole_ty</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">candidates</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"><span class="n" style="color: #333;">tcFilterHoleFits</span> <span class="n" style="color: #333;">limit</span> <span class="n" style="color: #333;"><span class="idiff left right">typed_hole</span></span> <span class="n" style="color: #333;">ht</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">hole_ty</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">candidates</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC736" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"checkingFitsFor {"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hole_ty</span></span>
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737
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<pre style="margin: 0;"> <span id="LC737" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">discards</span><span class="p">,</span> <span class="n" style="color: #333;">subs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="n" style="color: #333;">limit</span> <span class="n" style="color: #333;">ht</span> <span class="n" style="color: #333;">candidates</span></span>
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<pre style="margin: 0;"> <span id="LC738" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"checkingFitsFor }"</span> <span class="n" style="color: #333;">empty</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="895" 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">@@ -895,8 +866,7 @@ tcFilterHoleFits limit (TyH {..}) ht@(hole_ty, _) candidates =</td>
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895
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866
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">}</span></span>
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896
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867
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</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="LC868" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFVs</span> <span class="n" style="color: #333;">ref_vars</span> <span class="p">`</span><span class="n" style="color: #333;">unionFV</span><span class="p">`</span> <span class="n" style="color: #333;">hole_fvs</span> <span class="p">`</span><span class="n" style="color: #333;">unionFV</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoFVsOfType</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC898" class="line" lang="haskell"> <span class="n" style="color: #333;">hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyH</span> <span class="n" style="color: #333;">tyHRelevantCts</span> <span class="n" style="color: #333;">tyHImplics</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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899
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<pre style="margin: 0;">-<span id="LC899" class="line" lang="haskell"></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;">hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">typed_hole</span> <span class="p">{</span> <span class="n" style="color: #333;">th_hole</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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900
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870
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"></span>
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901
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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;">subsDiscardMsg</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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902
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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;">subsDiscardMsg</span> <span class="o" style="font-weight: 600;">=</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="895" 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">@@ -925,7 +895,8 @@ withoutUnification free_vars action =</td>
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925
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895
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<pre style="margin: 0;"> <span id="LC895" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Reset any mutated free variables</span></span>
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926
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896
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<pre style="margin: 0;"> <span id="LC896" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">restore</span> <span class="n" style="color: #333;">flexis</span></span>
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927
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897
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<pre style="margin: 0;"> <span id="LC897" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">result</span> <span class="p">}</span></span>
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928
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<pre style="margin: 0;">-<span id="LC928" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">restore</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">writeTcRef</span> <span class="kt" style="color: #458; font-weight: 600;">Flexi</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">metaTyVarRef</span></span>
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898
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<pre style="margin: 0;">+<span id="LC898" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">restore</span> <span class="n" style="color: #333;">tv</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;">traceTc</span> <span class="s" style="color: #d14;">"withoutUnification: restore flexi"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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899
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<pre style="margin: 0;">+<span id="LC899" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">writeTcRef</span> <span class="p">(</span><span class="n" style="color: #333;">metaTyVarRef</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Flexi</span> <span class="p">}</span></span>
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929
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900
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<pre style="margin: 0;"> <span id="LC900" class="line" lang="haskell"> <span class="n" style="color: #333;">fuvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fvVarList</span> <span class="n" style="color: #333;">free_vars</span></span>
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930
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901
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<pre style="margin: 0;"> <span id="LC901" class="line" lang="haskell"></span>
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931
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902
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<pre style="margin: 0;"> <span id="LC902" class="line" lang="haskell"><span class="cd">-- | Reports whether first type (ty_a) subsumes the second type (ty_b),</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="904" 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">@@ -933,14 +904,14 @@ withoutUnification free_vars action =</td>
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933
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904
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<pre style="margin: 0;"> <span id="LC904" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ty_a, i.e. `tcSubsumes a b == True` if b is a subtype of a.</span></span>
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934
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905
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<pre style="margin: 0;"> <span id="LC905" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubsumes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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935
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906
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<pre style="margin: 0;"> <span id="LC906" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubsumes</span> <span class="n" style="color: #333;">ty_a</span> <span class="n" style="color: #333;">ty_b</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">tcCheckHoleFit</span> <span class="n" style="color: #333;">dummyHole</span> <span class="n" style="color: #333;">ty_a</span> <span class="n" style="color: #333;">ty_b</span></span>
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936
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<pre style="margin: 0;">-<span id="LC936" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">dummyHole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyH</span> <span class="n" style="color: #333;">emptyBag</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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907
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<pre style="margin: 0;">+<span id="LC907" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">dummyHole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TypedHole</span> <span class="p">{</span> <span class="n" style="color: #333;">th_relevant_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span></span>
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<pre style="margin: 0;">+<span id="LC908" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">th_implics</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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909
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<pre style="margin: 0;">+<span id="LC909" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">th_hole</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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937
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910
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<pre style="margin: 0;"> <span id="LC910" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC911" class="line" lang="haskell"><span class="cd">-- | A tcSubsumes which takes into account relevant constraints, to fix trac</span></span>
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939
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912
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<pre style="margin: 0;"> <span id="LC912" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- #14273. This makes sure that when checking whether a type fits the hole,</span></span>
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913
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<pre style="margin: 0;"> <span id="LC913" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the type has to be subsumed by type of the hole as well as fulfill all</span></span>
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941
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<pre style="margin: 0;"> <span id="LC914" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constraints on the type of the hole.</span></span>
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<pre style="margin: 0;">-<span id="LC942" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note: The simplifier may perform unification, so make sure to restore any</span></span>
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943
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<pre style="margin: 0;">-<span id="LC943" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- free type variables to avoid side-effects.</span></span>
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<pre style="margin: 0;"> <span id="LC915" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckHoleFit</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypedHole</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The hole to check against</span></span>
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<pre style="margin: 0;"> <span id="LC916" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span></span>
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The type to check against (possibly modified, e.g. refined)</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">@@ -949,56 +920,48 @@ tcCheckHoleFit :: TypedHole -- ^ The hole to check against</td>
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<pre style="margin: 0;"> <span id="LC920" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Whether it was a match, and the wrapper from hole_ty to ty.</span></span>
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<pre style="margin: 0;"> <span id="LC921" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckHoleFit</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">hole_ty</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">hole_ty</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC922" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">idHsWrapper</span><span class="p">)</span></span>
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952
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<pre style="margin: 0;">-<span id="LC952" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckHoleFit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ty<span class="idiff left right">H</span></span> <span class="p">{</span><span class="o" style="font-weight: 600;">..</span><span class="p">})</span> <span class="n" style="color: #333;">hole_ty</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">discardErrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC923" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckHoleFit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ty<span class="idiff left right">pedHole</span></span> <span class="p">{</span><span class="o" style="font-weight: 600;">..</span><span class="p">})</span> <span class="n" style="color: #333;">hole_ty</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">discardErrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC924" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- We wrap the subtype constraint in the implications to pass along the</span></span>
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<pre style="margin: 0;"> <span id="LC925" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- givens, and so we must ensure that any nested implications and skolems</span></span>
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<pre style="margin: 0;"> <span id="LC926" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- end up with the correct level. The implications are ordered so that</span></span>
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the innermost (the one with the highest level) is first, so it</span></span>
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928
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<pre style="margin: 0;"> <span id="LC928" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- suffices to get the level of the first one (or the current level, if</span></span>
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958
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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;">-- there are no implications involved).</span></span>
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959
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<pre style="margin: 0;">-<span id="LC959" class="line" lang="haskell"> <span class="n" style="color: #333;">innermost_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">t<span class="idiff left right">yHI</span>mplics</span> <span class="kr" style="font-weight: 600;">of</span></span>
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930
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<pre style="margin: 0;">+<span id="LC930" class="line" lang="haskell"> <span class="n" style="color: #333;">innermost_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">t<span class="idiff left right">h_i</span>mplics</span> <span class="kr" style="font-weight: 600;">of</span></span>
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960
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931
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<pre style="margin: 0;"> <span id="LC931" 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;">getTcLevel</span></span>
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961
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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;">-- imp is the innermost implication</span></span>
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962
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933
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<pre style="margin: 0;"> <span id="LC933" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">imp</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;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ic_tclvl</span> <span class="n" style="color: #333;">imp</span><span class="p">)</span></span>
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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="p">(</span><span class="n" style="color: #333;">wrp</span><span class="p">,</span> <span class="n" style="color: #333;">wanted</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">setTcLevel</span> <span class="n" style="color: #333;">innermost_lvl</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">captureConstraints</span> <span class="o" style="font-weight: 600;">$</span></span>
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964
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<pre style="margin: 0;">-<span id="LC964" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">tcSubType_NC</span> <span class="kt" style="color: #458; font-weight: 600;">ExprSigCtxt</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">hole_ty</span></span>
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934
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<pre style="margin: 0;">+<span id="LC934" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wr<span class="idiff left right">a</span>p</span><span class="p">,</span> <span class="n" style="color: #333;">wanted</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">setTcLevel</span> <span class="n" style="color: #333;">innermost_lvl</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">captureConstraints</span> <span class="o" style="font-weight: 600;">$</span></span>
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935
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<pre style="margin: 0;">+<span id="LC935" class="line" lang="haskell"> <span class="n" style="color: #333;">tcSubType_NC</span> <span class="kt" style="color: #458; font-weight: 600;">ExprSigCtxt</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">hole_ty</span></span>
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965
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936
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<pre style="margin: 0;"> <span id="LC936" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"Checking hole fit {"</span> <span class="n" style="color: #333;">empty</span></span>
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966
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937
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<pre style="margin: 0;"> <span id="LC937" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"wanteds are: "</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wanted</span></span>
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967
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<pre style="margin: 0;">-<span id="LC967" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isEmptyWC</span> <span class="n" style="color: #333;">wanted</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">tyHRelevantCts</span></span>
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968
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<pre style="margin: 0;">-<span id="LC968" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"}"</span> <span class="n" style="color: #333;">empty</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">wrp</span><span class="p">)</span></span>
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938
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isEmptyWC</span> <span class="n" style="color: #333;">wanted</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">th_relevant_cts</span></span>
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939
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<pre style="margin: 0;">+<span id="LC939" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"}"</span> <span class="n" style="color: #333;">empty</span></span>
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940
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<pre style="margin: 0;">+<span id="LC940" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">wrap</span><span class="p">)</span> <span class="p">}</span></span>
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969
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941
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<pre style="margin: 0;"> <span id="LC941" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">fresh_binds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTcEvBinds</span></span>
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970
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942
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<pre style="margin: 0;"> <span id="LC942" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The relevant constraints may contain HoleDests, so we must</span></span>
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971
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943
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<pre style="margin: 0;"> <span id="LC943" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- take care to clone them as well (to avoid #15370).</span></span>
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<pre style="margin: 0;">-<span id="LC972" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">cloned_relevants</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapBagM</span> <span class="n" style="color: #333;">cloneWanted</span> <span class="n" style="color: #333;">t<span class="idiff left right">yHRelevantC</span>ts</span></span>
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944
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<pre style="margin: 0;">+<span id="LC944" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">cloned_relevants</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapBagM</span> <span class="n" style="color: #333;">cloneWanted</span> <span class="n" style="color: #333;">t<span class="idiff left right">h_relevant_c</span>ts</span></span>
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973
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945
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<pre style="margin: 0;"> <span id="LC945" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We wrap the WC in the nested implications, see</span></span>
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974
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<pre style="margin: 0;">-<span id="LC974" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Nested Implications]</span></span>
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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="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">outermost_first</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">tyHImplics</span></span>
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976
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<pre style="margin: 0;">-<span id="LC976" class="line" lang="haskell"> <span class="n" style="color: #333;">setWC</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setWCAndBinds</span> <span class="n" style="color: #333;">fresh_binds</span></span>
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946
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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Checking hole fits]</span></span>
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947
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<pre style="margin: 0;">+<span id="LC947" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">outermost_first</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">th_implics</span></span>
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977
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948
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<pre style="margin: 0;"> <span id="LC948" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We add the cloned relevants to the wanteds generated by</span></span>
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978
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<pre style="margin: 0;">-<span id="LC978" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the call to tcSubType_NC, see Note [Relevant <span class="idiff left right">C</span>onstraints]</span></span>
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949
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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 call to tcSubType_NC, see Note [Relevant <span class="idiff left right">c</span>onstraints]</span></span>
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979
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950
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<pre style="margin: 0;"> <span id="LC950" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- There's no need to clone the wanteds, because they are</span></span>
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980
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951
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<pre style="margin: 0;"> <span id="LC951" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- freshly generated by `tcSubtype_NC`.</span></span>
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981
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952
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<pre style="margin: 0;"> <span id="LC952" class="line" lang="haskell"> <span class="n" style="color: #333;">w_rel_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addSimples</span> <span class="n" style="color: #333;">wanted</span> <span class="n" style="color: #333;">cloned_relevants</span></span>
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982
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<pre style="margin: 0;">-<span id="LC982" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">w_givens</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">foldr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">setWC</span></span> <span class="n" style="color: #333;">w_rel_cts</span> <span class="n" style="color: #333;">outermost_first</span></span>
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983
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<pre style="margin: 0;">-<span id="LC983" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"<span class="idiff left">w_givens are: "</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">w_givens</span></span></span>
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984
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<pre style="margin: 0;">-<span id="LC984" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rem</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">runTcSDeriveds</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">simpl_top</span> <span class="n" style="color: #333;"><span class="idiff left right">w_givens</span></span></span>
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953
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<pre style="margin: 0;">+<span id="LC953" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">final_wc</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">foldr</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">setWCAndBinds</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fresh_binds</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">w_rel_cts</span> <span class="n" style="color: #333;">outermost_first</span></span>
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954
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<pre style="margin: 0;">+<span id="LC954" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"<span class="idiff left">final_wc is: "</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</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">final_wc</span></span></span>
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955
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<pre style="margin: 0;">+<span id="LC955" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rem</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">runTcSDeriveds</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">simpl_top</span> <span class="n" style="color: #333;"><span class="idiff left right">final_wc</span></span></span>
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<pre style="margin: 0;"> <span id="LC956" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't want any insoluble or simple constraints left, but</span></span>
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957
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<pre style="margin: 0;"> <span id="LC957" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- solved implications are ok (and necessary for e.g. undefined)</span></span>
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958
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<pre style="margin: 0;"> <span id="LC958" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"rems was:"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rem</span></span>
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988
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959
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<pre style="margin: 0;"> <span id="LC959" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"}"</span> <span class="n" style="color: #333;">empty</span></span>
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989
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<pre style="margin: 0;">-<span id="LC989" 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;">isSolvedWC</span> <span class="n" style="color: #333;">rem</span><span class="p">,</span> <span class="n" style="color: #333;">wrp</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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960
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<pre style="margin: 0;">+<span id="LC960" 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;">isSolvedWC</span> <span class="n" style="color: #333;">rem</span><span class="p">,</span> <span class="n" style="color: #333;">wr<span class="idiff left right">a</span>p</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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990
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961
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<pre style="margin: 0;"> <span id="LC961" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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991
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962
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<pre style="margin: 0;"> <span id="LC962" class="line" lang="haskell"> <span class="n" style="color: #333;">setWCAndBinds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">EvBindsVar</span> <span class="c1" style="color: #998; font-style: italic;">-- Fresh ev binds var.</span></span>
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992
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963
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<pre style="margin: 0;"> <span id="LC963" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Implication</span> <span class="c1" style="color: #998; font-style: italic;">-- The implication to put WC in.</span></span>
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993
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964
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<pre style="margin: 0;"> <span id="LC964" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="c1" style="color: #998; font-style: italic;">-- The WC constraints to put implic.</span></span>
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994
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965
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<pre style="margin: 0;"> <span id="LC965" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="c1" style="color: #998; font-style: italic;">-- The new constraints.</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;">setWCAndBinds</span> <span class="n" style="color: #333;">binds</span> <span class="n" style="color: #333;">imp</span> <span class="n" style="color: #333;">wc</span></span>
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996
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<pre style="margin: 0;">-<span id="LC996" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span></span>
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997
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<pre style="margin: 0;">-<span id="LC997" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitBag</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">imp</span> <span class="p">{</span> <span class="n" style="color: #333;">ic_wanted</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc</span> <span class="p">,</span> <span class="n" style="color: #333;">ic_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binds</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC998" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC999" class="line" lang="haskell"><span class="cd">-- | Maps a plugin that needs no state to one with an empty one.</span></span>
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<pre style="margin: 0;">-<span id="LC1000" class="line" lang="haskell"><span class="n" style="color: #333;">fromPureHFPlugin</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HoleFitPlugin</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HoleFitPluginR</span></span>
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1001
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<pre style="margin: 0;">-<span id="LC1001" class="line" lang="haskell"><span class="n" style="color: #333;">fromPureHFPlugin</span> <span class="n" style="color: #333;">plug</span> <span class="o" style="font-weight: 600;">=</span></span>
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1002
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<pre style="margin: 0;">-<span id="LC1002" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleFitPluginR</span> <span class="p">{</span> <span class="n" style="color: #333;">hfPluginInit</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newTcRef</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1003
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<pre style="margin: 0;">-<span id="LC1003" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hfPluginRun</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">const</span> <span class="n" style="color: #333;">plug</span></span>
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1004
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<pre style="margin: 0;">-<span id="LC1004" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hfPluginStop</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">const</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span> <span class="p">}</span></span></pre>
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<pre style="margin: 0;">+<span id="LC967" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkImplicWC</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unitBag</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">imp</span> <span class="p">{</span> <span class="n" style="color: #333;">ic_wanted</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc</span> <span class="p">,</span> <span class="n" style="color: #333;">ic_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binds</span> <span class="p">}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#cf93ddc86e104212f370f013f519e12cc11e1f70"><strong>compiler/GHC/Tc/Errors/Hole.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">@@ -5,9 +5,9 @@</td>
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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;">GHC.Tc.Errors.Hole</span> <span class="kr" style="font-weight: 600;">where</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;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Constraint</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Implication</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Constraint</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Hole</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">Implication</span> <span class="p">)</span></span>
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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;">GHC.Utils.Outputable</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="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span> <span class="p">)</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="n" style="color: #333;">findValidHoleFits</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Implication</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;">Ct</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Ct</span></span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">findValidHoleFits</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Implication</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;">Ct</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Hole</span></span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span></span></pre>
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<li id="62e5fd382d9730853d0cbcec70620f1065b107cf">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#62e5fd382d9730853d0cbcec70620f1065b107cf"><strong>compiler/GHC/Tc/Errors/Hole/FitTypes.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">@@ -21,20 +21,21 @@ import GHC.Types.Name</td>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Function</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">on</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">TypedHole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Ty<span class="idiff left">H</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 right">tyHRelevantC</span>ts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Cts</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;">-- ^ Any relevant Cts to the hole</span></span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tyHI</span>mplics</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Implication</span><span class="p">]</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;">-- ^ The nested implications of the hole with the</span></span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- innermost implication first.</span></span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tyHCt</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">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Ct</span></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;"><span class="idiff left right">-- ^ The hole constraint itself, if available</span>.</span></span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">TypedHole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Ty<span class="idiff left">pedHole</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 right">th_relevant_c</span>ts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- ^ Any relevant Cts to the hole</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">th_i</span>mplics</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Implication</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- ^ The nested implications of the hole with the</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- innermost implication first.</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">th_hole</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">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Hole</span></span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- ^ The hole itself, if available. Only for debugging</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">}</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;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">TypedHole</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC34" 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;">TyH</span> <span class="n" style="color: #333;">rels</span> <span class="n" style="color: #333;">implics</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC34" 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;">TypedHole</span> <span class="p">{</span> <span class="n" style="color: #333;">th_relevant_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rels</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">th_implics</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">th_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hole</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"> <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;">text</span> <span class="s" style="color: #d14;">"TypedHole"</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span></span>
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<pre style="margin: 0;">-<span id="LC36" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rels</span> <span class="o" style="font-weight: 600;">$+$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">implics</span> <span class="o" style="font-weight: 600;">$+$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct</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="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rels</span> <span class="o" style="font-weight: 600;">$+$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">implics</span> <span class="o" style="font-weight: 600;">$+$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hole</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="cd">-- | HoleFitCandidates are passed to hole fit plugins and then</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;">-- checked whether they fit a given typed-hole.</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">@@ -51,9 +52,6 @@ pprHoleFitCand (IdHFCand cid) = text "Id HFC: " <> ppr cid</td>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="n" style="color: #333;">pprHoleFitCand</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NameHFCand</span> <span class="n" style="color: #333;">cname</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Name HFC: "</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cname</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="n" style="color: #333;">pprHoleFitCand</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GreHFCand</span> <span class="n" style="color: #333;">cgre</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Gre HFC: "</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cgre</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC55" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC56" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">NamedThing</span> <span class="kt" style="color: #458; font-weight: 600;">HoleFitCandidate</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"> <span class="n" style="color: #333;">getName</span> <span class="n" style="color: #333;">hfc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">hfc</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IdHFCand</span> <span class="n" style="color: #333;">cid</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">cid</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#902811828741e6bcd64702935bbb54edbbd070ef"><strong>compiler/GHC/Tc/Gen/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">@@ -36,7 +36,6 @@ import {-# SOURCE #-} GHC.Tc.Gen.Splice( tcSpliceExpr, tcTypedBracket, tcUntyp</td>
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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.Builtin.Names.TH</span><span class="p">(</span> <span class="n" style="color: #333;">liftStringName</span><span class="p">,</span> <span class="n" style="color: #333;">liftName</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="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</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.Tc.Types.Constraint</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">HoleSort</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="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Zonk</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.Tc.Utils.Monad</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.Tc.Utils.Unify</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">@@ -1408,22 +1407,21 @@ Suppose 'wurble' is not in scope, and we have</td>
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<pre style="margin: 0;"> <span id="LC1407" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1408" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then the renamer will make (HsUnboundVar "wurble) for 'wurble',</span></span>
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<pre style="margin: 0;"> <span id="LC1409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and the typechecker will typecheck it with tcUnboundId, giving it</span></span>
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<pre style="margin: 0;">-<span id="LC1411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a type 'alpha', and emitting a deferred CHoleCan constraint, to</span></span>
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<pre style="margin: 0;">-<span id="LC1412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be reported later.</span></span>
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<pre style="margin: 0;">+<span id="LC1410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a type 'alpha', and emitting a deferred Hole, to be reported later.</span></span>
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<pre style="margin: 0;"> <span id="LC1411" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But then comes the visible type application. If we do nothing, we'll</span></span>
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<pre style="margin: 0;"> <span id="LC1413" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">generate an immediate failure (in tc_app_err), saying that a function</span></span>
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<pre style="margin: 0;"> <span id="LC1414" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of type 'alpha' can't be applied to Bool. That's insane! And indeed</span></span>
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<pre style="margin: 0;"> <span id="LC1415" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">users complain bitterly (#13834, #17150.)</span></span>
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<pre style="margin: 0;"> <span id="LC1416" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1419" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The right error is the <span class="idiff left right">CHoleCan</span>, which has /already/ been emitted by</span></span>
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<pre style="margin: 0;">+<span id="LC1417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The right error is the <span class="idiff left right">Hole</span>, which has /already/ been emitted by</span></span>
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<pre style="margin: 0;"> <span id="LC1418" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tcUnboundId. It later reports 'wurble' as out of scope, and tries to</span></span>
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<pre style="margin: 0;"> <span id="LC1419" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">give its type.</span></span>
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<pre style="margin: 0;"> <span id="LC1420" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1421" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Fortunately in tcArgs we still have access to the function, so we can</span></span>
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<pre style="margin: 0;"> <span id="LC1422" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">check if it is a HsUnboundVar. We use this info to simply skip over</span></span>
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<pre style="margin: 0;"> <span id="LC1423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">any visible type arguments. We've already inferred the type of the</span></span>
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<pre style="margin: 0;">-<span id="LC1426" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">function, so we'll /already/ have emitted a <span class="idiff left right">CHoleCan constraint</span>;</span></span>
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<pre style="margin: 0;">+<span id="LC1424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">function, so we'll /already/ have emitted a <span class="idiff left right">Hole</span>;</span></span>
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<pre style="margin: 0;"> <span id="LC1425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">failing preserves that constraint.</span></span>
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<pre style="margin: 0;"> <span id="LC1426" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do /not/ want to fail altogether in this case (via failM) becuase</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">@@ -1900,14 +1898,13 @@ tcUnboundId :: HsExpr GhcRn -> OccName -> ExpRhoType -> TcM (HsExpr GhcTc)</td>
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1898
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<pre style="margin: 0;"> <span id="LC1898" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Others might simply be variables that accidentally have no binding site</span></span>
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1899
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<pre style="margin: 0;"> <span id="LC1899" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1900
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<pre style="margin: 0;"> <span id="LC1900" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We turn all of them into HsVar, since HsUnboundVar can't contain an</span></span>
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1903
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<pre style="margin: 0;">-<span id="LC1903" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Id; and indeed the evidence for the <span class="idiff left right">CHoleCan</span> does bind it, so it's</span></span>
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<pre style="margin: 0;">+<span id="LC1901" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Id; and indeed the evidence for the <span class="idiff left right">ExprHole</span> does bind it, so it's</span></span>
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1904
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<pre style="margin: 0;"> <span id="LC1902" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- not unbound any more!</span></span>
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1903
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<pre style="margin: 0;"> <span id="LC1903" class="line" lang="haskell"><span class="n" style="color: #333;">tcUnboundId</span> <span class="n" style="color: #333;">rn_expr</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">res_ty</span></span>
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1904
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<pre style="margin: 0;"> <span id="LC1904" 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;">ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenFlexiTyVarTy</span> <span class="c1" style="color: #998; font-style: italic;">-- Allow Int# etc (#12531)</span></span>
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1907
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1905
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<pre style="margin: 0;"> <span id="LC1905" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newSysName</span> <span class="n" style="color: #333;">occ</span></span>
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1908
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1906
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<pre style="margin: 0;"> <span id="LC1906" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLocalId</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">ty</span></span>
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1909
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<pre style="margin: 0;">-<span id="LC1909" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">can</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newHoleCt</span> <span class="kt" style="color: #458; font-weight: 600;">ExprHole</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC1910" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitInsoluble</span> <span class="n" style="color: #333;">can</span></span>
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<pre style="margin: 0;">+<span id="LC1907" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitNewExprHole</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty</span></span>
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1908
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<pre style="margin: 0;"> <span id="LC1908" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcWrapResultO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UnboundOccurrenceOf</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span> <span class="n" style="color: #333;">rn_expr</span></span>
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1909
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<pre style="margin: 0;"> <span id="LC1909" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="n" style="color: #333;">ev</span><span class="p">))</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1910" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.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">@@ -419,7 +419,7 @@ tcHsTypeApp wc_ty kind</td>
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<pre style="margin: 0;"> <span id="LC419" 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="LC420" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A HsWildCardBndrs's hswc_ext now only includes /named/ wildcards, so</span></span>
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<pre style="margin: 0;"> <span id="LC421" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">any unnamed wildcards stay unchanged in hswc_body. When called in</span></span>
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<pre style="margin: 0;">-<span id="LC422" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tcHsTypeApp, tcCheckLHsType will call emitAnon<span class="idiff left right">WildCardHoleConstraint</span></span></span>
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<pre style="margin: 0;">+<span id="LC422" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tcHsTypeApp, tcCheckLHsType will call emitAnon<span class="idiff left right">TypeHole</span></span></span>
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<pre style="margin: 0;"> <span id="LC423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on these anonymous wildcards. However, this would trigger</span></span>
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<pre style="margin: 0;"> <span id="LC424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">error/warning when an anonymous wildcard is passed in as a visible type</span></span>
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<pre style="margin: 0;"> <span id="LC425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">argument, which we do not want because users should be able to write</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">@@ -891,7 +891,7 @@ tcAnonWildCardOcc wc exp_kind</td>
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<pre style="margin: 0;"> <span id="LC891" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">warning</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">woptM</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnPartialTypeSignatures</span></span>
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<pre style="margin: 0;"> <span id="LC892" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC893" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="p">(</span><span class="n" style="color: #333;">part_tysig</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">warning</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC894" class="line" lang="haskell"> <span class="n" style="color: #333;">emitAnon<span class="idiff left right">WildCardHoleConstraint</span></span> <span class="n" style="color: #333;">wc_tv</span></span>
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<pre style="margin: 0;">+<span id="LC894" class="line" lang="haskell"> <span class="n" style="color: #333;">emitAnon<span class="idiff left right">TypeHole</span></span> <span class="n" style="color: #333;">wc_tv</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;">-- Why the 'unless' guard?</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;">-- See Note [Wildcards in visible kind application]</span></span>
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<pre style="margin: 0;"> <span id="LC897" 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">@@ -911,11 +911,11 @@ x = MkT</td>
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<pre style="margin: 0;"> <span id="LC911" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we should allow '@_' without emitting any hole constraints, and</span></span>
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<pre style="margin: 0;"> <span id="LC912" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">regardless of whether PartialTypeSignatures is enabled or not. But how would</span></span>
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<pre style="margin: 0;"> <span id="LC913" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the typechecker know which '_' is being used in VKA and which is not when it</span></span>
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<pre style="margin: 0;">-<span id="LC914" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">calls emitNamed<span class="idiff left right">WildCardHoleConstraints</span> in tcHsPartialSigType on all HsWildCardBndrs?</span></span>
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<pre style="margin: 0;">+<span id="LC914" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">calls emitNamed<span class="idiff left right">TypeHole</span> in tcHsPartialSigType on all HsWildCardBndrs?</span></span>
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<pre style="margin: 0;"> <span id="LC915" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The solution then is to neither rename nor include unnamed wildcards in HsWildCardBndrs,</span></span>
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<pre style="margin: 0;"> <span id="LC916" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but instead give every anonymous wildcard a fresh wild tyvar in tcAnonWildCardOcc.</span></span>
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And whenever we see a '@', we automatically turn on PartialTypeSignatures and</span></span>
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<pre style="margin: 0;">-<span id="LC918" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">turn off hole constraint warnings, and do not call emitAnon<span class="idiff left right">WildCardHoleConstraint</span></span></span>
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<pre style="margin: 0;">+<span id="LC918" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">turn off hole constraint warnings, and do not call emitAnon<span class="idiff left right">TypeHole</span></span></span>
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<pre style="margin: 0;"> <span id="LC919" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">under these conditions.</span></span>
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<pre style="margin: 0;"> <span id="LC920" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See related Note [Wildcards in visible type application] here and</span></span>
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<pre style="margin: 0;"> <span id="LC921" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [The wildcard story for types] in GHC.Hs.Types</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">@@ -3192,7 +3192,7 @@ tcHsPartialSigType ctxt sig_ty</td>
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<pre style="margin: 0;"> <span id="LC3192" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Spit out the wildcards (including the extra-constraints one)</span></span>
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<pre style="margin: 0;"> <span id="LC3193" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- as "hole" constraints, so that they'll be reported if necessary</span></span>
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<pre style="margin: 0;"> <span id="LC3194" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Extra-constraint holes in partial type signatures]</span></span>
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<pre style="margin: 0;">-<span id="LC3195" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left right">emitNamedWildCardHoleConstraints</span></span> <span class="n" style="color: #333;">wcs</span></span>
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<pre style="margin: 0;">+<span id="LC3195" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">mapM_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">emitNamedTypeHole</span></span> <span class="n" style="color: #333;">wcs</span></span>
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<pre style="margin: 0;"> <span id="LC3196" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3197" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Zonk, so that any nested foralls can "see" their occurrences</span></span>
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<pre style="margin: 0;"> <span id="LC3198" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Checking partial type signatures], in</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">@@ -3365,7 +3365,7 @@ tcHsPatSigType ctxt sig_ty</td>
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<pre style="margin: 0;"> <span id="LC3365" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsOpenType</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC3366" 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;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC3367" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3368" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left right">emitNamedWildCardHoleConstraints</span></span> <span class="n" style="color: #333;">wcs</span></span>
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<pre style="margin: 0;">+<span id="LC3368" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">mapM_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">emitNamedTypeHole</span></span> <span class="n" style="color: #333;">wcs</span></span>
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<pre style="margin: 0;"> <span id="LC3369" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3370" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sig_ty might have tyvars that are at a higher TcLevel (if hs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC3371" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- contains a forall). Promote these.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#04338da99bccd89402218ca19c5724762f0fe641"><strong>compiler/GHC/Tc/Gen/Rule.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">@@ -460,9 +460,9 @@ getRuleQuantCts wc</td>
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<pre style="margin: 0;"> <span id="LC460" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">float_wc</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="n" style="color: #333;">wc</span></span>
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<pre style="margin: 0;"> <span id="LC461" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC462" class="line" lang="haskell"> <span class="n" style="color: #333;">float_wc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyCoVarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cts</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC463" class="line" lang="haskell"> <span class="n" style="color: #333;">float_wc</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC463" class="line" lang="haskell"> <span class="n" style="color: #333;">float_wc</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_holes</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">holes</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span> <span class="n" style="color: #333;">simple_yes</span> <span class="p">`</span><span class="n" style="color: #333;">andCts</span><span class="p">`</span> <span class="n" style="color: #333;">implic_yes</span></span>
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<pre style="margin: 0;">-<span id="LC465" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">WC</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">wc_simple</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">simple_no</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_impl</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">implics_no</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC465" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">emptyWC</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">wc_simple</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">simple_no</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_impl</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">implics_no</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_holes</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">holes</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC466" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">simple_yes</span><span class="p">,</span> <span class="n" style="color: #333;">simple_no</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionBag</span> <span class="p">(</span><span class="n" style="color: #333;">rule_quant_ct</span> <span class="n" style="color: #333;">skol_tvs</span><span class="p">)</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">implic_yes</span><span class="p">,</span> <span class="n" style="color: #333;">implics_no</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAccumBagL</span> <span class="p">(</span><span class="n" style="color: #333;">float_implic</span> <span class="n" style="color: #333;">skol_tvs</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">@@ -480,8 +480,6 @@ getRuleQuantCts wc</td>
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<pre style="margin: 0;"> <span id="LC480" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">classifyPredType</span> <span class="p">(</span><span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC481" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">ok_eq</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC482" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [RULE quantification over equalities]</span></span>
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<pre style="margin: 0;">-<span id="LC483" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isHoleCt</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC484" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- Don't quantify over type holes, obviously</span></span>
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<pre style="margin: 0;"> <span id="LC483" 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="LC484" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfCt</span> <span class="n" style="color: #333;">ct</span> <span class="p">`</span><span class="n" style="color: #333;">disjointVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">skol_tvs</span></span>
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<pre style="margin: 0;"> <span id="LC485" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#e65390fa5a32c453a81a1c9a3e1c4464d155ca4a"><strong>compiler/GHC/Tc/Module.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">@@ -2589,7 +2589,7 @@ tcRnType hsc_env flexi normalise rdr_type</td>
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<pre style="margin: 0;"> <span id="LC2589" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- kindGeneralize, below</span></span>
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<pre style="margin: 0;"> <span id="LC2590" class="line" lang="haskell"> <span class="n" style="color: #333;">solveEqualities</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC2591" class="line" lang="haskell"> <span class="n" style="color: #333;">tcNamedWildCardBinders</span> <span class="n" style="color: #333;">wcs</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;">wcs'</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC2592" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;"><span class="idiff left right">emitNamedWildCardHoleConstraints</span></span> <span class="n" style="color: #333;">wcs'</span></span>
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<pre style="margin: 0;">+<span id="LC2592" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;"><span class="idiff left">mapM_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">emitNamedTypeHole</span></span> <span class="n" style="color: #333;">wcs'</span></span>
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<pre style="margin: 0;"> <span id="LC2593" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcLHsTypeUnsaturated</span> <span class="n" style="color: #333;">rn_type</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2594" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2595" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do kind generalisation; see Note [Kind-generalise in tcRnType]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#54436e21ea530a66a8a71bcc01c836f4740b8f02"><strong>compiler/GHC/Tc/Solver.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">@@ -31,7 +31,7 @@ import GHC.Prelude</td>
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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.Data.Bag</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.Core.Class</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Class</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">classKey</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">classTyCon</span> <span class="p">)</span></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.Driver.Session</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;">GHC.Types.Id</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">idType</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">mkLocalId</span></span> <span class="p">)</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;">GHC.Types.Id</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">idType</span> <span class="p">)</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;">GHC.Tc.Utils.Instantiate</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.Data.List.SetOps</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.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">@@ -42,6 +42,7 @@ import GHC.Tc.Errors</td>
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<pre style="margin: 0;"> <span id="LC42" 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="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Solver.Interact</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Solver.Canonical</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">makeSuperClasses</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">solveCallStack</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Solver.Flatten</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">flattenType</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcMType</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">TcM</span></span>
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<pre style="margin: 0;"> <span id="LC47" 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 class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">TcM</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Solver.Monad</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">TcS</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">@@ -145,8 +146,7 @@ simplifyTop wanteds</td>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">saved_msg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">readTcRef</span> <span class="n" style="color: #333;">errs_var</span></span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">writeTcRef</span> <span class="n" style="color: #333;">errs_var</span> <span class="n" style="color: #333;">emptyMessages</span></span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">warnAllUnsolved</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unsafe_ol</span></span>
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<pre style="margin: 0;">-<span id="LC149" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">warnAllUnsolved</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">emptyWC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unsafe_ol</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">whyUnsafe</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;"><$></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">readTcRef</span> <span class="n" style="color: #333;">errs_var</span></span>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">writeTcRef</span> <span class="n" style="color: #333;">errs_var</span> <span class="n" style="color: #333;">saved_msg</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">@@ -638,27 +638,15 @@ tcNormalise :: Bag EvVar -> Type -> TcM Type</td>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"><span class="n" style="color: #333;">tcNormalise</span> <span class="n" style="color: #333;">given_ids</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC639" 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;">lcl_env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getLclEnv</span></span>
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">given_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkGivenLoc</span> <span class="n" style="color: #333;">topTcLevel</span> <span class="kt" style="color: #458; font-weight: 600;">UnkSkol</span> <span class="n" style="color: #333;">lcl_env</span></span>
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<pre style="margin: 0;">-<span id="LC641" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">wanted_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 right">mk_wanted_ct</span></span></span>
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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">norm_loc</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">getCtLocM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PatCheckOrigin</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nothing</span></span></span>
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<pre style="margin: 0;"> <span id="LC642" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">res</span><span class="p">,</span> <span class="n" style="color: #333;">_ev_binds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">runTcS</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"tcNormalise {"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">given_ids</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">given_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkGivens</span> <span class="n" style="color: #333;">given_loc</span> <span class="p">(</span><span class="n" style="color: #333;">bagToList</span> <span class="n" style="color: #333;">given_ids</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC645" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">solveSimpleGivens</span> <span class="n" style="color: #333;">given_cts</span></span>
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<pre style="margin: 0;">-<span id="LC646" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wcs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveSimpleWanteds</span> <span class="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="n" style="color: #333;">wanted_ct</span><span class="p">)</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;">-- It's an invariant that this wc_simple will always be</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;">-- a singleton Ct, since that's what we fed in as input.</span></span>
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<pre style="margin: 0;">-<span id="LC649" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">bagToList</span> <span class="p">(</span><span class="n" style="color: #333;">wc_simple</span> <span class="n" style="color: #333;">wcs</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="LC650" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ct</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;">ctEvPred</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC651" class="line" lang="haskell"> <span class="n" style="color: #333;">cts</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"tcNormalise"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flattenType</span> <span class="n" style="color: #333;">norm_loc</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"tcNormalise }"</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>
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<pre style="margin: 0;"> <span id="LC648" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">ty'</span> <span class="p">}</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;">return</span> <span class="n" style="color: #333;">res</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC655" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC656" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_wanted_ct</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span></span>
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<pre style="margin: 0;">-<span id="LC657" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_wanted_ct</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="LC658" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarOcc</span> <span class="s" style="color: #d14;">"$tcNorm"</span></span>
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<pre style="margin: 0;">-<span id="LC659" class="line" lang="haskell"> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newSysName</span> <span class="n" style="color: #333;">occ</span></span>
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<pre style="margin: 0;">-<span id="LC660" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLocalId</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC661" class="line" lang="haskell"> <span class="n" style="color: #333;">newHoleCt</span> <span class="kt" style="color: #458; font-weight: 600;">ExprHole</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC650" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Superclasses and satisfiability]</span></span>
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<pre style="margin: 0;"> <span id="LC652" 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">@@ -696,11 +684,8 @@ if some local equalities are solved for. See "Wrinkle: Local equalities"</td>
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<pre style="margin: 0;"> <span id="LC684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in Note [Type normalisation] in Check.</span></span>
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<pre style="margin: 0;"> <span id="LC685" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC686" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To accomplish its stated goal, tcNormalise first feeds the local constraints</span></span>
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<pre style="margin: 0;">-<span id="LC699" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">into solveSimpleGivens, then stuffs the argument type in a CHoleCan, and feeds</span></span>
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<pre style="margin: 0;">-<span id="LC700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that singleton Ct into solveSimpleWanteds, which reduces the type in the</span></span>
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<pre style="margin: 0;">-<span id="LC701" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CHoleCan as much as possible with respect to the local given constraints. When</span></span>
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<pre style="margin: 0;">-<span id="LC702" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">solveSimpleWanteds is finished, we dig out the type from the CHoleCan and</span></span>
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<pre style="margin: 0;">-<span id="LC703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">return that.</span></span>
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<pre style="margin: 0;">+<span id="LC687" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">into solveSimpleGivens, then uses flattenType to simplify the desired type</span></span>
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<pre style="margin: 0;">+<span id="LC688" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with respect to the givens.</span></span>
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC690" 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="LC691" 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">@@ -889,8 +874,8 @@ mkResidualConstraints rhs_tclvl ev_binds_var</td>
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<pre style="margin: 0;"> <span id="LC874" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ic_no_eqs</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="LC875" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ic_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">skol_info</span> <span class="p">}</span></span>
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876
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<pre style="margin: 0;"> <span id="LC876" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC892" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">outer_simple</span></span>
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<pre style="margin: 0;">-<span id="LC893" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span> <span class="p">})}</span></span>
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<pre style="margin: 0;">+<span id="LC877" 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;"><span class="idiff left right">empty</span>WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">outer_simple</span></span>
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span> <span class="p">})}</span></span>
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879
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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880
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<pre style="margin: 0;"> <span id="LC880" class="line" lang="haskell"> <span class="n" style="color: #333;">full_theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">full_theta_vars</span></span>
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896
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881
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<pre style="margin: 0;"> <span id="LC881" class="line" lang="haskell"> <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">InferSkol</span> <span class="p">[</span> <span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">mkSigmaTy</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">full_theta</span> <span class="n" style="color: #333;">ty</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">@@ -1516,7 +1501,7 @@ solveWantedsAndDrop wanted</td>
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1501
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<pre style="margin: 0;"> <span id="LC1501" class="line" lang="haskell"><span class="n" style="color: #333;">solveWanteds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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1502
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<pre style="margin: 0;"> <span id="LC1502" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- so that the inert set doesn't mindlessly propagate.</span></span>
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1518
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1503
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<pre style="margin: 0;"> <span id="LC1503" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: wc_simples may be wanted /or/ derived now</span></span>
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1519
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<pre style="margin: 0;">-<span id="LC1519" class="line" lang="haskell"><span class="n" style="color: #333;">solveWanteds</span> <span class="n" style="color: #333;">wc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span> <span class="p">})</span></span>
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1504
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<pre style="margin: 0;">+<span id="LC1504" class="line" lang="haskell"><span class="n" style="color: #333;">solveWanteds</span> <span class="n" style="color: #333;">wc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_holes</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">holes</span></span> <span class="p">})</span></span>
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1520
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1505
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<pre style="margin: 0;"> <span id="LC1505" 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;">cur_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getTcLevel</span></span>
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1521
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1506
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<pre style="margin: 0;"> <span id="LC1506" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"solveWanteds {"</span> <span class="o" style="font-weight: 600;">$</span></span>
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1522
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1507
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<pre style="margin: 0;"> <span id="LC1507" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Level ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cur_lvl</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">@@ -1530,9 +1515,12 @@ solveWanteds wc@(WC { wc_simple = simples, wc_impl = implics })</td>
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1530
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1515
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<pre style="margin: 0;"> <span id="LC1515" class="line" lang="haskell"> <span class="n" style="color: #333;">implics</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">wc_impl</span> <span class="n" style="color: #333;">wc1</span></span>
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1531
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1516
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<pre style="margin: 0;"> <span id="LC1516" class="line" lang="haskell"></span>
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1532
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1517
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<pre style="margin: 0;"> <span id="LC1517" class="line" lang="haskell"> <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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1533
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<pre style="margin: 0;">-<span id="LC1533" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left right">final</span>_wc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simpl_loop</span> <span class="mi" style="color: #099;">0</span> <span class="p">(</span><span class="n" style="color: #333;">solverIterations</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="n" style="color: #333;">floated_eqs</span></span>
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1518
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<pre style="margin: 0;">+<span id="LC1518" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left right">solved</span>_wc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simpl_loop</span> <span class="mi" style="color: #099;">0</span> <span class="p">(</span><span class="n" style="color: #333;">solverIterations</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="n" style="color: #333;">floated_eqs</span></span>
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1534
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1519
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<pre style="margin: 0;"> <span id="LC1519" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">wc1</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics2</span> <span class="p">})</span></span>
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1535
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1520
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<pre style="margin: 0;"> <span id="LC1520" 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="p">;</span> <span class="n" style="color: #333;">holes'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplifyHoles</span> <span class="n" style="color: #333;">holes</span></span>
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1522
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<pre style="margin: 0;">+<span id="LC1522" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_wc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">solved_wc</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">holes'</span> <span class="p">}</span></span>
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1523
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<pre style="margin: 0;">+<span id="LC1523" class="line" lang="haskell"></span>
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1536
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1524
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<pre style="margin: 0;"> <span id="LC1524" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ev_binds_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcEvBindsVar</span></span>
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1537
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1525
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<pre style="margin: 0;"> <span id="LC1525" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">bb</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getTcEvBindsMap</span> <span class="n" style="color: #333;">ev_binds_var</span></span>
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1538
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1526
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<pre style="margin: 0;"> <span id="LC1526" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"solveWanteds }"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1779" 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="1767" 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">@@ -1779,12 +1767,13 @@ setImplicationStatus implic@(Implic { ic_status = status</td>
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1779
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1767
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<pre style="margin: 0;"> <span id="LC1767" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1780
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1768
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<pre style="margin: 0;"> <span id="LC1768" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">final_implic</span> <span class="p">}</span></span>
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1781
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1769
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<pre style="margin: 0;"> <span id="LC1769" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1782
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<pre style="margin: 0;">-<span id="LC1782" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc</span></span>
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1770
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<pre style="margin: 0;">+<span id="LC1770" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_holes</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">holes</span></span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc</span></span>
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1783
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1771
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<pre style="margin: 0;"> <span id="LC1771" class="line" lang="haskell"></span>
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1784
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1772
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<pre style="margin: 0;"> <span id="LC1772" class="line" lang="haskell"> <span class="n" style="color: #333;">pruned_simples</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dropDerivedSimples</span> <span class="n" style="color: #333;">simples</span></span>
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1785
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1773
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<pre style="margin: 0;"> <span id="LC1773" class="line" lang="haskell"> <span class="n" style="color: #333;">pruned_implics</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterBag</span> <span class="n" style="color: #333;">keep_me</span> <span class="n" style="color: #333;">implics</span></span>
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1786
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1774
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<pre style="margin: 0;"> <span id="LC1774" class="line" lang="haskell"> <span class="n" style="color: #333;">pruned_wc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pruned_simples</span></span>
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1787
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<pre style="margin: 0;">-<span id="LC1787" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pruned_implics</span> <span class="p">}</span></span>
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1775
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<pre style="margin: 0;">+<span id="LC1775" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pruned_implics</span></span>
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1776
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<pre style="margin: 0;">+<span id="LC1776" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">holes</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- do not prune holes; these should be reported</span></span>
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<pre style="margin: 0;"> <span id="LC1777" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1778" class="line" lang="haskell"> <span class="n" style="color: #333;">keep_me</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Implication</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="LC1779" class="line" lang="haskell"> <span class="n" style="color: #333;">keep_me</span> <span class="n" style="color: #333;">ic</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">@@ -1898,6 +1887,14 @@ neededEvVars implic@(Implic { ic_given = givens</td>
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<pre style="margin: 0;"> <span id="LC1887" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_given</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">needs</span> <span class="c1" style="color: #998; font-style: italic;">-- Add the rhs vars of the Wanted bindings only</span></span>
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<pre style="margin: 0;"> <span id="LC1888" 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;">evVarsOfTerm</span> <span class="n" style="color: #333;">rhs</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">needs</span></span>
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<pre style="margin: 0;"> <span id="LC1889" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1890" 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="LC1891" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyHoles</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;">Hole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1892" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyHoles</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapBagM</span> <span class="n" style="color: #333;">simpl_hole</span></span>
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<pre style="margin: 0;">+<span id="LC1893" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC1894" class="line" lang="haskell"> <span class="n" style="color: #333;">simpl_hole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span></span>
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<pre style="margin: 0;">+<span id="LC1895" class="line" lang="haskell"> <span class="n" style="color: #333;">simpl_hole</span> <span class="n" style="color: #333;">h</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_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;">hole_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1896" 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;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flattenType</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC1897" 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;">h</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty'</span> <span class="p">})</span> <span class="p">}</span></span>
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1898
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<pre style="margin: 0;"> <span id="LC1898" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1899" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Delete dead Given evidence bindings]</span></span>
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<pre style="margin: 0;"> <span id="LC1900" 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">@@ -2143,7 +2140,6 @@ approximateWC float_past_equalities wc</td>
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2140
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<pre style="margin: 0;"> <span id="LC2140" class="line" lang="haskell"></span>
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2141
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<pre style="margin: 0;"> <span id="LC2141" class="line" lang="haskell"> <span class="n" style="color: #333;">is_floatable</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="n" style="color: #333;">ct</span></span>
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2145
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2142
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<pre style="margin: 0;"> <span id="LC2142" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isGivenCt</span> <span class="n" style="color: #333;">ct</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="LC2146" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isHoleCt</span> <span class="n" style="color: #333;">ct</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="LC2143" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">insolubleEqCt</span> <span class="n" style="color: #333;">ct</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="LC2144" 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;">tyCoVarsOfCt</span> <span class="n" style="color: #333;">ct</span> <span class="p">`</span><span class="n" style="color: #333;">disjointVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">skol_tvs</span></span>
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<pre style="margin: 0;"> <span id="LC2145" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.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 +34,6 @@ import GHC.Tc.Instance.Family ( tcTopNormaliseNewTypeTF_maybe )</td>
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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;">GHC.Types.Var</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;">GHC.Types.Var.Env</span><span class="p">(</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">)</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.Types.Var.Set</span><span class="p">(</span> <span class="n" style="color: #333;">delVarSetList</span> <span class="p">)</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.Types.Name.Occurrence</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">OccName</span> <span class="p">)</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.Utils.Outputable</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.Driver.Session</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</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.Types.Name.Set</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">@@ -67,8 +66,7 @@ Canonicalization converts a simple constraint to a canonical form. It is</td>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unary (i.e. treats individual constraints one at a time).</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Constraints originating from user-written code come into being as</span></span>
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<pre style="margin: 0;">-<span id="LC70" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CNonCanonicals (except for CHoleCans, arising from holes). We know nothing</span></span>
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">about these constraints. So, first:</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CNonCanonicals. We know nothing about these constraints. So, first:</span></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Classify CNonCanoncal constraints, depending on whether they</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> are equalities, class predicates, or other.</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">@@ -137,9 +135,6 @@ canonicalize (CFunEqCan { cc_ev = ev</td>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="cp" style="color: #999; font-weight: 600;">{-# SCC "canEqLeafFunEq" #-}</span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"> <span class="n" style="color: #333;">canCFunEqCan</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">xis1</span> <span class="n" style="color: #333;">fsk</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="LC140" class="line" lang="haskell"><span class="n" style="color: #333;">canonicalize</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="n" style="color: #333;">cc_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ</span><span class="p">,</span> <span class="n" style="color: #333;">cc_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hole</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC141" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canHole</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">hole</span></span>
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<pre style="margin: 0;">-<span id="LC142" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC138" 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="LC139" 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="LC140" 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">@@ -718,17 +713,6 @@ canIrred status ev</td>
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<pre style="margin: 0;"> <span id="LC713" 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;">continueWith</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="haskell"> <span class="n" style="color: #333;">mkIrredCt</span> <span class="n" style="color: #333;">status</span> <span class="n" style="color: #333;">new_ev</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC715" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC721" class="line" lang="haskell"><span class="n" style="color: #333;">canHole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OccName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HoleSort</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC722" class="line" lang="haskell"><span class="n" style="color: #333;">canHole</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">hole_sort</span></span>
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<pre style="margin: 0;">-<span id="LC723" 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;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">-<span id="LC724" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">xi</span><span class="p">,</span><span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_SubstOnly</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">pred</span> <span class="c1" style="color: #998; font-style: italic;">-- co :: xi ~ pred</span></span>
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<pre style="margin: 0;">-<span id="LC725" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">co</span> <span class="p">`</span><span class="n" style="color: #333;">andWhenContinue</span><span class="p">`</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC726" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">updInertIrreds</span> <span class="p">(`</span><span class="n" style="color: #333;">snocCts</span><span class="p">`</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_ev</span></span>
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<pre style="margin: 0;">-<span id="LC727" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ</span></span>
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<pre style="margin: 0;">-<span id="LC728" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hole_sort</span> <span class="p">}))</span></span>
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<pre style="margin: 0;">-<span id="LC729" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">stopWith</span> <span class="n" style="color: #333;">new_ev</span> <span class="s" style="color: #d14;">"Emit insoluble hole"</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC730" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC731" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC716" 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="LC717" 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="LC718" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Quantified predicates</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">@@ -1401,6 +1385,7 @@ can_eq_app ev s1 t1 s2 t2</td>
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<pre style="margin: 0;"> <span id="LC1385" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ev</span></span>
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1386
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<pre style="margin: 0;"> <span id="LC1386" 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;">unifyDeriveds</span> <span class="n" style="color: #333;">loc</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">]</span> <span class="p">[</span><span class="n" style="color: #333;">s1</span><span class="p">,</span> <span class="n" style="color: #333;">t1</span><span class="p">]</span> <span class="p">[</span><span class="n" style="color: #333;">s2</span><span class="p">,</span> <span class="n" style="color: #333;">t2</span><span class="p">]</span></span>
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1387
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<pre style="margin: 0;"> <span id="LC1387" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">stopWith</span> <span class="n" style="color: #333;">ev</span> <span class="s" style="color: #d14;">"Decomposed [D] AppTy"</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1388" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1389" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC1390" 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;">co_s</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">loc</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">s2</span></span>
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<pre style="margin: 0;"> <span id="LC1391" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">arg_loc</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#81707f1fe21087531cefd70879aa09c2be5c1d22"><strong>compiler/GHC/Tc/Solver/Flatten.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">@@ -5,7 +5,7 @@</td>
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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;">GHC.Tc.Solver.Flatten</span><span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">FlattenMode</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="LC7" class="line" lang="haskell"> <span class="n" style="color: #333;">flatten</span><span class="p">,</span> <span class="n" style="color: #333;">flattenKind</span><span class="p">,</span> <span class="n" style="color: #333;">flattenArgsNom</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="haskell"> <span class="n" style="color: #333;">rewriteTyVar</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"> <span class="n" style="color: #333;">rewriteTyVar</span><span class="p">,</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">flattenType</span></span><span class="p"><span class="idiff right">,</span></span></span>
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9
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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="n" style="color: #333;">unflattenWanteds</span></span>
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11
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"> <span class="p">)</span> <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">@@ -825,6 +825,20 @@ flattenArgsNom ev tc tys</td>
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<pre style="margin: 0;"> <span id="LC825" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"flatten }"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys'</span><span class="p">))</span></span>
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826
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826
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<pre style="margin: 0;"> <span id="LC826" 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;">tys'</span><span class="p">,</span> <span class="n" style="color: #333;">cos</span><span class="p">,</span> <span class="n" style="color: #333;">kind_co</span><span class="p">)</span> <span class="p">}</span></span>
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827
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827
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<pre style="margin: 0;"> <span id="LC827" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC828" class="line" lang="haskell"><span class="cd">-- | Flatten a type w.r.t. nominal equality. This is useful to rewrite</span></span>
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a type w.r.t. any givens. It does not do type-family reduction. This</span></span>
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- will never emit new constraints. Call this when the inert set contains</span></span>
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<pre style="margin: 0;">+<span id="LC831" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- only givens.</span></span>
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"><span class="n" style="color: #333;">flattenType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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833
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<pre style="margin: 0;">+<span id="LC833" class="line" lang="haskell"><span class="n" style="color: #333;">flattenType</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC834" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- More info about FM_SubstOnly in Note [Holes] in GHC.Tc.Types.Constraint</span></span>
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<pre style="margin: 0;">+<span id="LC835" 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="p">(</span><span class="n" style="color: #333;">xi</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;">runFlatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_SubstOnly</span> <span class="n" style="color: #333;">loc</span> <span class="kt" style="color: #458; font-weight: 600;">Given</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"> <span class="n" style="color: #333;">flatten_one</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- use Given flavor so that it is rewritten</span></span>
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<pre style="margin: 0;">+<span id="LC838" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- only w.r.t. Givens, never Wanteds/Deriveds</span></span>
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<pre style="margin: 0;">+<span id="LC839" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (Shouldn't matter, if only Givens are present</span></span>
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<pre style="margin: 0;">+<span id="LC840" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- anyway)</span></span>
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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;">return</span> <span class="n" style="color: #333;">xi</span> <span class="p">}</span></span>
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842
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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844
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<pre style="margin: 0;"> <span id="LC844" 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">@@ -195,7 +195,7 @@ solve_simple_wanteds :: WantedConstraints -> TcS (Int, WantedConstraints)</td>
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Try solving these constraints</span></span>
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<pre style="margin: 0;"> <span id="LC196" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Affects the unification state (of course) but not the inert set</span></span>
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The result is not necessarily zonked</span></span>
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<pre style="margin: 0;">-<span id="LC198" class="line" lang="haskell"><span class="n" style="color: #333;">solve_simple_wanteds</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples1</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics1</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="haskell"><span class="n" style="color: #333;">solve_simple_wanteds</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples1</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics1</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_holes</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">holes</span></span> <span class="p">})</span></span>
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199
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nestTcS</span> <span class="o" style="font-weight: 600;">$</span></span>
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200
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">solveSimples</span> <span class="n" style="color: #333;">simples1</span></span>
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201
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201
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">implics2</span><span class="p">,</span> <span class="n" style="color: #333;">tv_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">fun_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">others</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getUnsolvedInerts</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">@@ -204,7 +204,8 @@ solve_simple_wanteds (WC { wc_simple = simples1, wc_impl = implics1 })</td>
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204
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Unflatten after solving the simple wanteds]</span></span>
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<pre style="margin: 0;"> <span id="LC205" 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;">unif_count</span></span>
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">others</span> <span class="p">`</span><span class="n" style="color: #333;">andCts</span><span class="p">`</span> <span class="n" style="color: #333;">unflattened_eqs</span></span>
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207
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics1</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">implics2</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics1</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">implics2</span></span>
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">holes</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC209" class="line" lang="haskell"></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;">{- Note [The solveSimpleWanteds loop]</span></span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="265" 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">@@ -264,7 +265,7 @@ runTcPluginsGiven</td>
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<pre style="margin: 0;"> <span id="LC265" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'solveSimpleWanteds' should feed the updated wanteds back into the</span></span>
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- main solver.</span></span>
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<pre style="margin: 0;"> <span id="LC267" class="line" lang="haskell"><span class="n" style="color: #333;">runTcPluginsWanted</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC267" class="line" lang="haskell"><span class="n" style="color: #333;">runTcPluginsWanted</span> <span class="n" style="color: #333;">wc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples1</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_impl</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">implics1</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="haskell"><span class="n" style="color: #333;">runTcPluginsWanted</span> <span class="n" style="color: #333;">wc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples1</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">simples1</span></span>
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">wc</span><span class="p">)</span></span>
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271
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<pre style="margin: 0;"> <span id="LC271" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -285,11 +286,10 @@ runTcPluginsWanted wc@(WC { wc_simple = simples1, wc_impl = implics1 })</td>
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286
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<pre style="margin: 0;"> <span id="LC286" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC287" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">setEv</span> <span class="n" style="color: #333;">solved_wanted</span></span>
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<pre style="margin: 0;"> <span id="LC288" 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;">notNull</span> <span class="p">(</span><span class="n" style="color: #333;">pluginNewCts</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC288" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">WC</span></span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">new_wanted</span> <span class="p">`</span><span class="n" style="color: #333;">andCts</span><span class="p">`</span></span>
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">wc</span></span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">new_wanted</span> <span class="p">`</span><span class="n" style="color: #333;">andCts</span><span class="p">`</span></span>
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<pre style="margin: 0;"> <span id="LC290" class="line" lang="haskell"> <span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">unsolved_wanted</span> <span class="p">`</span><span class="n" style="color: #333;">andCts</span><span class="p">`</span></span>
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<pre style="margin: 0;"> <span id="LC291" class="line" lang="haskell"> <span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">unsolved_derived</span> <span class="p">`</span><span class="n" style="color: #333;">andCts</span><span class="p">`</span></span>
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<pre style="margin: 0;">-<span id="LC291" class="line" lang="haskell"> <span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">insols</span></span>
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<pre style="margin: 0;">-<span id="LC292" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics1</span> <span class="p">}</span> <span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell"> <span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">insols</span> <span class="p">}</span> <span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC294" class="line" lang="haskell"> <span class="n" style="color: #333;">setEv</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvTerm</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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295
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="haskell"> <span class="n" style="color: #333;">setEv</span> <span class="p">(</span><span class="n" style="color: #333;">ev</span><span class="p">,</span><span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span> <span class="kr" style="font-weight: 600;">of</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">@@ -494,7 +494,6 @@ interactWithInertsStage wi</td>
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<pre style="margin: 0;"> <span id="LC494" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">interactIrred</span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">wi</span></span>
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<pre style="margin: 0;"> <span id="LC495" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CDictCan</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">interactDict</span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">wi</span></span>
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<pre style="margin: 0;"> <span id="LC496" 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;">pprPanic</span> <span class="s" style="color: #d14;">"interactWithInerts"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wi</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC497" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- CHoleCan are put straight into inert_frozen, so never get here</span></span>
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- CNonCanonical have been canonicalised</span></span>
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">InteractResult</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953"><strong>compiler/GHC/Tc/Solver/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">@@ -198,7 +198,7 @@ import GHC.Types.Unique.Set</td>
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [WorkList priorities]</span></span>
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<pre style="margin: 0;"> <span id="LC200" 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="LC201" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A WorkList contains canonical and non-canonical items (of all flavors).</span></span>
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A WorkList contains canonical and non-canonical items (of all flavo<span class="idiff left right">u</span>rs).</span></span>
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Notice that each Ct now has a simplification depth. We may</span></span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">consider using this depth for prioritization as well in the future.</span></span>
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<pre style="margin: 0;"> <span id="LC204" 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">@@ -1653,8 +1653,7 @@ add_item ics item@(CDictCan { cc_ev = ev, cc_class = cls, cc_tyargs = tys })</td>
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<pre style="margin: 0;"> <span id="LC1653" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1654" class="line" lang="haskell"><span class="n" style="color: #333;">add_item</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">item</span></span>
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<pre style="margin: 0;"> <span id="LC1655" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"upd_inert set: can't happen! Inserting "</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1656" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">item</span> <span class="c1" style="color: #998; font-style: italic;">-- Can't be CNonCanonical, CHoleCan,</span></span>
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<pre style="margin: 0;">-<span id="LC1657" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because they only land in inert_irreds</span></span>
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<pre style="margin: 0;">+<span id="LC1656" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">item</span> <span class="c1" style="color: #998; font-style: italic;">-- Can't be CNonCanonical because they only land in inert_irreds</span></span>
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<pre style="margin: 0;"> <span id="LC1657" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1658" class="line" lang="haskell"><span class="n" style="color: #333;">bumpUnsolvedCount</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</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;">Int</span></span>
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1660
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1659
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<pre style="margin: 0;"> <span id="LC1659" class="line" lang="haskell"><span class="n" style="color: #333;">bumpUnsolvedCount</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isWanted</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</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">@@ -1896,10 +1895,6 @@ be decomposed. Otherwise we end up with a "Can't match [Int] ~</td>
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1896
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<pre style="margin: 0;"> <span id="LC1895" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">[[Int]]" which is true, but a bit confusing because the outer type</span></span>
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1897
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1896
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<pre style="margin: 0;"> <span id="LC1896" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constructors match.</span></span>
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1898
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1897
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<pre style="margin: 0;"> <span id="LC1897" class="line" lang="haskell"></span>
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1899
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<pre style="margin: 0;">-<span id="LC1899" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Similarly, if we have a CHoleCan, we'd like to rewrite it with any</span></span>
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1900
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<pre style="margin: 0;">-<span id="LC1900" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Givens, to give as informative an error messasge as possible</span></span>
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<pre style="margin: 0;">-<span id="LC1901" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(#12468, #11325).</span></span>
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1902
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<pre style="margin: 0;">-<span id="LC1902" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1898" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Hence:</span></span>
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<pre style="margin: 0;"> <span id="LC1899" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * In the main simplifier loops in GHC.Tc.Solver (solveWanteds,</span></span>
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1900
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<pre style="margin: 0;"> <span id="LC1900" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> simpl_loop), we feed the insolubles in solveSimpleWanteds,</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">@@ -2352,8 +2347,6 @@ removeInertCt is ct =</td>
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<pre style="margin: 0;"> <span id="LC2347" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CQuantCan</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"removeInertCt: CQuantCan"</span></span>
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2353
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2348
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<pre style="margin: 0;"> <span id="LC2348" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"removeInertCt: CIrredEvCan"</span></span>
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2354
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2349
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<pre style="margin: 0;"> <span id="LC2349" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CNonCanonical</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"removeInertCt: CNonCanonical"</span></span>
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<pre style="margin: 0;">-<span id="LC2355" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"removeInertCt: CHoleCan"</span></span>
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<pre style="margin: 0;">-<span id="LC2356" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2350" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2351" class="line" lang="haskell"><span class="n" style="color: #333;">lookupFlatCache</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</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;">TcS</span> <span class="p">(</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;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavour</span><span class="p">))</span></span>
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2359
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2352
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<pre style="margin: 0;"> <span id="LC2352" class="line" lang="haskell"><span class="n" style="color: #333;">lookupFlatCache</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">tys</span></span>
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<li id="3b6d78a50c8462304f843b952a88e531718dbbd2">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#3b6d78a50c8462304f843b952a88e531718dbbd2"><strong>compiler/GHC/Tc/Types/Constraint.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">@@ -14,8 +14,7 @@ module GHC.Tc.Types.Constraint (</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isEmptyCts</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isCTyEqCan</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isCFunEqCan</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isPendingScDict</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">superClassesMightHelp</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getPendingWantedScs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isCDictCan_Maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isCFunEqCan_maybe</span><span class="p">,</span></span>
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17
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isCNonCanonical</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isWantedCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isDerivedCt</span><span class="p">,</span></span>
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18
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isGivenCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isHoleCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isOutOfScopeCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isExprHoleCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTypeHoleCt</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isCNonCanonical</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isWantedCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isDerivedCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isGivenCt</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;">isUserTypeErrorCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getUserTypeErrorMsg</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctEvidence</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctLoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setCtLoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctFlavour</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctEqRel</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctOrigin</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctEvId</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTcEqPredLikeEv</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">@@ -26,9 +25,11 @@ module GHC.Tc.Types.Constraint (</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCts</span><span class="p">,</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;">tyCoVarsOfCtList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCtsList</span><span class="p">,</span></span>
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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="kt" style="color: #458; font-weight: 600;">Hole</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;">HoleSort</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;">isOutOfScopeHole</span><span class="p">,</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="kt" style="color: #458; font-weight: 600;">WantedConstraints</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;">insolubleWC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">emptyWC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isEmptyWC</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isSolvedWC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">andWC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">unionsWC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkSimpleWC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkImplicWC</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addInsols</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">insolublesOnly</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addSimples</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addImplics</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addInsols</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">insolublesOnly</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addSimples</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addImplics</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">addHole</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfWC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dropDerivedWC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dropDerivedSimples</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfWCList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">insolubleCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">insolubleEqCt</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isDroppableCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">insolubleImplic</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">@@ -62,9 +63,6 @@ module GHC.Tc.Types.Constraint (</td>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprEvVarTheta</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprEvVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprEvVarWithType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC65" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- holes</span></span>
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<pre style="margin: 0;">-<span id="LC66" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleSort</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="LC67" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC68" 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">@@ -202,14 +200,6 @@ data Ct</td>
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="haskell"> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Hole constraints]</span></span>
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Treated as an "insoluble" constraint</span></span>
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Insoluble constraints]</span></span>
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<pre style="margin: 0;">-<span id="LC208" class="line" lang="haskell"> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="haskell"> <span class="n" style="color: #333;">cc_occ</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccName</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- The name of this hole</span></span>
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<pre style="margin: 0;">-<span id="LC210" class="line" lang="haskell"> <span class="n" style="color: #333;">cc_hole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HoleSort</span> <span class="c1" style="color: #998; font-style: italic;">-- The sort of this hole (expr, type, ...)</span></span>
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<pre style="margin: 0;">-<span id="LC211" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC212" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CQuantCan</span> <span class="kt" style="color: #458; font-weight: 600;">QCInst</span> <span class="c1" style="color: #998; font-style: italic;">-- A quantified constraint</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;">-- NB: I expect to make more of the cases in Ct</span></span>
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- look like this, with the payload in 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">@@ -230,13 +220,47 @@ instance Outputable QCInst where</td>
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<pre style="margin: 0;"> <span id="LC220" 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;">QCI</span> <span class="p">{</span> <span class="n" style="color: #333;">qci_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</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;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"></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;">------------</span></span>
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="haskell"><span class="cd">-- | A hole stores the information needed to report diagnostics</span></span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- about holes in terms (unbound identifiers or underscores) or</span></span>
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in types (also called wildcards, as used in partial type</span></span>
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- signatures). See Note [Holes].</span></span>
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<pre style="margin: 0;">+<span id="LC227" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span></span>
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<pre style="margin: 0;">+<span id="LC228" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_sort</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HoleSort</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ What flavour of hole is this?</span></span>
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_occ</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccName</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The name of this hole</span></span>
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Type to be printed to the user</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;">-- For expression holes: type of expr</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;">-- For type holes: the missing type</span></span>
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_loc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Where hole was written</span></span>
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<pre style="margin: 0;">+<span id="LC234" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For the hole_loc, we usually only want the TcLclEnv stored within.</span></span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Except when we flatten, where we need a whole location. And this</span></span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- might get reported to the user if reducing type families in a</span></span>
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- hole type loops.</span></span>
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC241" class="line" lang="haskell"><span class="cd">-- | Used to indicate which sort of hole we have.</span></span>
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<pre style="margin: 0;">-<span id="LC234" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HoleSort</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExprHole</span></span>
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HoleSort</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExprHole</span><span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Id</span></span></span>
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Either an out-of-scope variable or a "true" hole in an</span></span>
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<pre style="margin: 0;">-<span id="LC236" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- expression (TypedHoles)</span></span>
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<pre style="margin: 0;">+<span id="LC244" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- expression (TypedHoles).</span></span>
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<pre style="margin: 0;">+<span id="LC245" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The 'Id' is where to store "evidence": this evidence</span></span>
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<pre style="margin: 0;">+<span id="LC246" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- will be an erroring expression for -fdefer-type-errors.</span></span>
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<pre style="margin: 0;"> <span id="LC247" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TypeHole</span></span>
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<pre style="margin: 0;"> <span id="LC248" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A hole in a type (PartialTypeSignatures)</span></span>
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<pre style="margin: 0;"> <span id="LC249" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC250" 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;">Hole</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC251" 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;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_sort</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExprHole</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC252" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ</span></span>
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC254" 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;">$</span> <span class="p">(</span><span class="n" style="color: #333;">braces</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">occ</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">colon</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">id</span><span class="p">)</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="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC255" 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;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_sort</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TypeHole</span></span>
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<pre style="margin: 0;">+<span id="LC256" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ</span></span>
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<pre style="margin: 0;">+<span id="LC257" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">braces</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">occ</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">colon</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC259" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC260" 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;">HoleSort</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC261" 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;">ExprHole</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"ExprHole:"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">TypeHole</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"TypeHole"</span></span>
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC264" 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="LC265" class="line" lang="haskell"><span class="cd">-- | Used to indicate extra information about why a CIrredCan is irreducible</span></span>
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">CtIrredStatus</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">@@ -252,20 +276,8 @@ instance Outputable CtIrredStatus where</td>
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<pre style="margin: 0;"> <span id="LC276" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">BlockedCIS</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(blocked)"</span></span>
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<pre style="margin: 0;"> <span id="LC277" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">OtherCIS</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(soluble)"</span></span>
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<pre style="margin: 0;"> <span id="LC278" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Hole constraints]</span></span>
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<pre style="margin: 0;">-<span id="LC256" 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="LC257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CHoleCan constraints are used for two kinds of holes,</span></span>
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<pre style="margin: 0;">-<span id="LC258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">distinguished by cc_hole:</span></span>
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<pre style="margin: 0;">-<span id="LC259" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * For holes in expressions</span></span>
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<pre style="margin: 0;">-<span id="LC261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> e.g. f x = g _ x</span></span>
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<pre style="margin: 0;">-<span id="LC262" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * For holes in type signatures</span></span>
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<pre style="margin: 0;">-<span id="LC264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> e.g. f :: _ -> _</span></span>
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<pre style="margin: 0;">-<span id="LC265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x = [x,True]</span></span>
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<pre style="margin: 0;">-<span id="LC266" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [CIrredCan constraints]</span></span>
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<pre style="margin: 0;">-<span id="LC268" 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="LC279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [CIrredCan constraints]</span></span>
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<pre style="margin: 0;">+<span id="LC280" 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="LC281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CIrredCan constraints are used for constraints that are "stuck"</span></span>
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<pre style="margin: 0;"> <span id="LC282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - we can't solve them (yet)</span></span>
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<pre style="margin: 0;"> <span id="LC283" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - we can't use them to solve other constraints</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">@@ -350,6 +362,40 @@ unenforced).</td>
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<pre style="margin: 0;"> <span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The almost-function-free property is checked by isAlmostFunctionFree in GHC.Tc.Utils.TcType.</span></span>
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The flattener (in GHC.Tc.Solver.Flatten) produces types that are almost function-free.</span></span>
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<pre style="margin: 0;"> <span id="LC364" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Holes]</span></span>
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<pre style="margin: 0;">+<span id="LC366" 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="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This Note explains how GHC tracks *holes*.</span></span>
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A hole represents one of two conditions:</span></span>
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<pre style="margin: 0;">+<span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - A missing bit of an expression. Example: foo x = x + _</span></span>
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - A missing bit of a type. Example: bar :: Int -> _</span></span>
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">What these have in common is that both cause GHC to emit a diagnostic to the</span></span>
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">user describing the bit that is left out.</span></span>
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375
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"></span>
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376
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When a hole is encountered, a new entry of type Hole is added to the ambient</span></span>
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377
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">WantedConstraints. The type (hole_ty) of the hole is then simplified during</span></span>
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378
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">solving (with respect to any Givens in surrounding implications). It is</span></span>
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379
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">reported with all the other errors in GHC.Tc.Errors. No type family reduction</span></span>
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380
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is done on hole types; this is purely because we think it will produce</span></span>
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381
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">better error messages not to reduce type families. This is why the</span></span>
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382
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Tc.Solver.Flatten.flattenType function uses FM_SubstOnly.</span></span>
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383
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"></span>
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384
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For expression holes, the user has the option of deferring errors until runtime</span></span>
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385
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with -fdefer-type-errors. In this case, the hole actually has evidence: this</span></span>
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386
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">evidence is an erroring expression that prints an error and crashes at runtime.</span></span>
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387
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The ExprHole variant of holes stores the Id that will be bound to this evidence;</span></span>
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388
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">during constraint generation, this Id was inserted into the expression output</span></span>
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389
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by the type checker.</span></span>
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390
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"></span>
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391
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">You might think that the type of the stored Id is the same as the type of the</span></span>
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392
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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">hole. However, because the hole type (hole_ty) is rewritten with respect to</span></span>
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393
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">givens, this might not be the case. That is, the hole_ty is always (~) to the</span></span>
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394
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<pre style="margin: 0;">+<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type of the Id, but they might not be `eqType`. We need the type of the generated</span></span>
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395
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<pre style="margin: 0;">+<span id="LC395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">evidence to match what is expected in the context of the hole, and so we must</span></span>
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396
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<pre style="margin: 0;">+<span id="LC396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">store these types separately.</span></span>
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397
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<pre style="margin: 0;">+<span id="LC397" class="line" lang="haskell"></span>
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398
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<pre style="margin: 0;">+<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Type-level holes have no evidence at all.</span></span>
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<pre style="margin: 0;"> <span id="LC399" 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="LC400" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC401" class="line" lang="haskell"><span class="n" style="color: #333;">mkNonCanonical</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</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">@@ -419,7 +465,6 @@ instance Outputable Ct where</td>
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<pre style="margin: 0;"> <span id="LC465" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">pend_sc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"CDictCan(psc)"</span></span>
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<pre style="margin: 0;"> <span id="LC466" 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;">text</span> <span class="s" style="color: #d14;">"CDictCan"</span></span>
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_status</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">status</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"CIrredCan"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">status</span></span>
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<pre style="margin: 0;">-<span id="LC422" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"CHoleCan:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">occ</span></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CQuantCan</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">QCI</span> <span class="p">{</span> <span class="n" style="color: #333;">qci_pend_sc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pend_sc</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC469" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">pend_sc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"CQuantCan(psc)"</span></span>
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<pre style="margin: 0;"> <span id="LC470" 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;">text</span> <span class="s" style="color: #d14;">"CQuantCan"</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">@@ -482,9 +527,10 @@ tyCoVarsOfWCList = fvVarList . tyCoFVsOfWC</td>
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<pre style="margin: 0;"> <span id="LC527" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- computation. See Note [Deterministic FV] in GHC.Utils.FV.</span></span>
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<pre style="margin: 0;"> <span id="LC528" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoFVsOfWC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FV</span></span>
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<pre style="margin: 0;"> <span id="LC529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Only called on *zonked* things, hence no need to worry about flatten-skolems</span></span>
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<pre style="margin: 0;">-<span id="LC485" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoFVsOfWC</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simple</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implic</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoFVsOfWC</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simple</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implic</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_holes</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">holes</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC531" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoFVsOfCts</span> <span class="n" style="color: #333;">simple</span> <span class="p">`</span><span class="n" style="color: #333;">unionFV</span><span class="p">`</span></span>
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<pre style="margin: 0;">-<span id="LC487" class="line" lang="haskell"> <span class="n" style="color: #333;">tyCoFVsOfBag</span> <span class="n" style="color: #333;">tyCoFVsOfImplic</span> <span class="n" style="color: #333;">implic</span></span>
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"> <span class="n" style="color: #333;">tyCoFVsOfBag</span> <span class="n" style="color: #333;">tyCoFVsOfImplic</span> <span class="n" style="color: #333;">implic</span> <span class="p">`</span><span class="n" style="color: #333;">unionFV</span><span class="p">`</span></span>
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"> <span class="n" style="color: #333;">tyCoFVsOfBag</span> <span class="n" style="color: #333;">tyCoFVsOfHole</span> <span class="n" style="color: #333;">holes</span></span>
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<pre style="margin: 0;"> <span id="LC534" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC535" class="line" lang="haskell"><span class="cd">-- | Returns free variables of Implication as a composable FV computation.</span></span>
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Deterministic FV] in GHC.Utils.FV.</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">@@ -500,6 +546,9 @@ tyCoFVsOfImplic (Implic { ic_skols = skols</td>
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<pre style="margin: 0;"> <span id="LC546" class="line" lang="haskell"> <span class="n" style="color: #333;">tyCoFVsVarBndrs</span> <span class="n" style="color: #333;">givens</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="haskell"> <span class="n" style="color: #333;">tyCoFVsOfWC</span> <span class="n" style="color: #333;">wanted</span></span>
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC549" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoFVsOfHole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FV</span></span>
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<pre style="margin: 0;">+<span id="LC550" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoFVsOfHole</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoFVsOfType</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC551" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC552" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoFVsOfBag</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;">FV</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</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;">FV</span></span>
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<pre style="margin: 0;"> <span id="LC553" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoFVsOfBag</span> <span class="n" style="color: #333;">tvs_of</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">unionFV</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">tvs_of</span><span class="p">)</span> <span class="n" style="color: #333;">emptyFV</span></span>
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<pre style="margin: 0;"> <span id="LC554" 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">@@ -552,7 +601,6 @@ isDroppableCt ct</td>
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<pre style="margin: 0;"> <span id="LC601" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"> <span class="n" style="color: #333;">keep_deriv</span></span>
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<pre style="margin: 0;"> <span id="LC603" 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;">ct</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC555" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CHoleCan</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="LC604" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_status</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">InsolubleCIS</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">keep_eq</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC605" 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;">keep_eq</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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606
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<pre style="margin: 0;"> <span id="LC606" 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">@@ -676,26 +724,6 @@ isCNonCanonical :: Ct -> Bool</td>
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<pre style="margin: 0;"> <span id="LC724" class="line" lang="haskell"><span class="n" style="color: #333;">isCNonCanonical</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CNonCanonical</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="LC725" class="line" lang="haskell"><span class="n" style="color: #333;">isCNonCanonical</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="LC726" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC679" class="line" lang="haskell"><span class="n" style="color: #333;">isHoleCt</span><span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</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="LC680" class="line" lang="haskell"><span class="n" style="color: #333;">isHoleCt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CHoleCan</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="LC681" class="line" lang="haskell"><span class="n" style="color: #333;">isHoleCt</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="LC682" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC683" class="line" lang="haskell"><span class="n" style="color: #333;">isOutOfScopeCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</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="LC684" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- A Hole that does not have a leading underscore is</span></span>
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<pre style="margin: 0;">-<span id="LC685" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- simply an out-of-scope variable, and we treat that</span></span>
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<pre style="margin: 0;">-<span id="LC686" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a bit differently when it comes to error reporting</span></span>
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<pre style="margin: 0;">-<span id="LC687" class="line" lang="haskell"><span class="n" style="color: #333;">isOutOfScopeCt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ</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;">startsWithUnderscore</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC688" class="line" lang="haskell"><span class="n" style="color: #333;">isOutOfScopeCt</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="LC689" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC690" class="line" lang="haskell"><span class="n" style="color: #333;">isExprHoleCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</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="LC691" class="line" lang="haskell"><span class="n" style="color: #333;">isExprHoleCt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExprHole</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="LC692" class="line" lang="haskell"><span class="n" style="color: #333;">isExprHoleCt</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="LC693" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC694" class="line" lang="haskell"><span class="n" style="color: #333;">isTypeHoleCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</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="LC695" class="line" lang="haskell"><span class="n" style="color: #333;">isTypeHoleCt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TypeHole</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="LC696" class="line" lang="haskell"><span class="n" style="color: #333;">isTypeHoleCt</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="LC697" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC698" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC727" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Custom type errors in constraints]</span></span>
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<pre style="margin: 0;"> <span id="LC728" 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="LC729" 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">@@ -884,37 +912,39 @@ v%************************************************************************</td>
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<pre style="margin: 0;"> <span id="LC912" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;"> <span id="LC913" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span> <span class="c1" style="color: #998; font-style: italic;">-- Unsolved constraints, all wanted</span></span>
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<pre style="margin: 0;"> <span id="LC914" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</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;">Implication</span></span>
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<pre style="margin: 0;">+<span id="LC915" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_holes</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;">Hole</span></span>
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<pre style="margin: 0;"> <span id="LC916" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC918" class="line" lang="haskell"><span class="n" style="color: #333;">emptyWC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;">-<span id="LC890" class="line" lang="haskell"><span class="n" style="color: #333;">emptyWC</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC919" class="line" lang="haskell"><span class="n" style="color: #333;">emptyWC</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span></span>
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<pre style="margin: 0;">+<span id="LC920" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span></span>
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<pre style="margin: 0;">+<span id="LC921" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC922" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC923" class="line" lang="haskell"><span class="n" style="color: #333;">mkSimpleWC</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;"> <span id="LC924" class="line" lang="haskell"><span class="n" style="color: #333;">mkSimpleWC</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;">-<span id="LC894" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToBag</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkNonCanonical</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC895" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span> <span class="p">}</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;">emptyWC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToBag</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkNonCanonical</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC926" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="haskell"><span class="n" style="color: #333;">mkImplicWC</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;">Implication</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;"> <span id="LC928" class="line" lang="haskell"><span class="n" style="color: #333;">mkImplicWC</span> <span class="n" style="color: #333;">implic</span></span>
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<pre style="margin: 0;">-<span id="LC899" 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">WC</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">wc_simple</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">emptyBag</span></span><span class="p"><span class="idiff right">,</span></span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implic</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC929" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">emptyWC</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">{</span></span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implic</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC930" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC931" class="line" lang="haskell"><span class="n" style="color: #333;">isEmptyWC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</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="LC902" class="line" lang="haskell"><span class="n" style="color: #333;">isEmptyWC</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">i</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC903" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">i</span></span>
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<pre style="margin: 0;">-<span id="LC904" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC932" class="line" lang="haskell"><span class="n" style="color: #333;">isEmptyWC</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</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;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">holes</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC933" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">holes</span></span>
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<pre style="margin: 0;"> <span id="LC934" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC935" class="line" lang="haskell"><span class="cd">-- | Checks whether a the given wanted constraints are solved, i.e.</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;">-- that there are no simple constraints left and all the implications</span></span>
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<pre style="margin: 0;"> <span id="LC937" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are solved.</span></span>
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938
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<pre style="margin: 0;"> <span id="LC938" class="line" lang="haskell"><span class="n" style="color: #333;">isSolvedWC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</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="LC910" class="line" lang="haskell"><span class="n" style="color: #333;">isSolvedWC</span> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span><span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc_simple</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc_impl</span><span class="p">}</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC911" class="line" lang="haskell"> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">allBag</span> <span class="p">(</span><span class="n" style="color: #333;">isSolvedStatus</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ic_status</span><span class="p">)</span> <span class="n" style="color: #333;">wc_impl</span></span>
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<pre style="margin: 0;">+<span id="LC939" class="line" lang="haskell"><span class="n" style="color: #333;">isSolvedWC</span> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span><span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc_simple</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc_impl</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_holes</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">holes</span></span><span class="p">}</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC940" class="line" lang="haskell"> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">allBag</span> <span class="p">(</span><span class="n" style="color: #333;">isSolvedStatus</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ic_status</span><span class="p">)</span> <span class="n" style="color: #333;">wc_impl</span><span class="idiff left"> </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">isEmptyBag</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">holes</span></span></span>
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<pre style="margin: 0;"> <span id="LC941" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC942" class="line" lang="haskell"><span class="n" style="color: #333;">andWC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;">-<span id="LC914" class="line" lang="haskell"><span class="n" style="color: #333;">andWC</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f1</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">i1</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC915" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f2</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">i2</span> <span class="p">})</span></span>
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943
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"><span class="n" style="color: #333;">andWC</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f1</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">i1</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_holes</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">h1</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC944" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f2</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">i2</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_holes</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">h2</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC945" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f1</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">f2</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;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">i1</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">i2</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 class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">i1</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">i2</span></span>
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<pre style="margin: 0;">+<span id="LC947" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">h1</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">h2</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC948" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC949" class="line" lang="haskell"><span class="n" style="color: #333;">unionsWC</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;"> <span id="LC950" class="line" lang="haskell"><span class="n" style="color: #333;">unionsWC</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">andWC</span> <span class="n" style="color: #333;">emptyWC</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">@@ -931,11 +961,16 @@ addInsols :: WantedConstraints -> Bag Ct -> WantedConstraints</td>
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<pre style="margin: 0;"> <span id="LC961" class="line" lang="haskell"><span class="n" style="color: #333;">addInsols</span> <span class="n" style="color: #333;">wc</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;"> <span id="LC962" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc_simple</span> <span class="n" style="color: #333;">wc</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">cts</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC963" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="haskell"><span class="n" style="color: #333;">addHole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;">+<span id="LC965" class="line" lang="haskell"><span class="n" style="color: #333;">addHole</span> <span class="n" style="color: #333;">wc</span> <span class="n" style="color: #333;">hole</span></span>
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<pre style="margin: 0;">+<span id="LC966" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hole</span> <span class="p">`</span><span class="n" style="color: #333;">consBag</span><span class="p">`</span> <span class="n" style="color: #333;">wc_holes</span> <span class="n" style="color: #333;">wc</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC967" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC968" class="line" lang="haskell"><span class="n" style="color: #333;">insolublesOnly</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;"> <span id="LC969" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Keep only the definitely-insoluble constraints</span></span>
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<pre style="margin: 0;">-<span id="LC936" class="line" lang="haskell"><span class="n" style="color: #333;">insolublesOnly</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC970" class="line" lang="haskell"><span class="n" style="color: #333;">insolublesOnly</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_holes</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">holes</span></span> <span class="p">})</span></span>
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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="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterBag</span> <span class="n" style="color: #333;">insolubleCt</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;">-<span id="LC938" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapBag</span> <span class="n" style="color: #333;">implic_insols_only</span> <span class="n" style="color: #333;">implics</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC972" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapBag</span> <span class="n" style="color: #333;">implic_insols_only</span> <span class="n" style="color: #333;">implics</span></span>
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<pre style="margin: 0;">+<span id="LC973" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterBag</span> <span class="n" style="color: #333;">isOutOfScopeHole</span> <span class="n" style="color: #333;">holes</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC974" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC975" class="line" lang="haskell"> <span class="n" style="color: #333;">implic_insols_only</span> <span class="n" style="color: #333;">implic</span></span>
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<pre style="margin: 0;"> <span id="LC976" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implic</span> <span class="p">{</span> <span class="n" style="color: #333;">ic_wanted</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">insolublesOnly</span> <span class="p">(</span><span class="n" style="color: #333;">ic_wanted</span> <span class="n" style="color: #333;">implic</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">@@ -953,9 +988,10 @@ insolubleImplic :: Implication -> Bool</td>
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<pre style="margin: 0;"> <span id="LC988" class="line" lang="haskell"><span class="n" style="color: #333;">insolubleImplic</span> <span class="n" style="color: #333;">ic</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isInsolubleStatus</span> <span class="p">(</span><span class="n" style="color: #333;">ic_status</span> <span class="n" style="color: #333;">ic</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC989" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC990" class="line" lang="haskell"><span class="n" style="color: #333;">insolubleWC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</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="LC956" class="line" lang="haskell"><span class="n" style="color: #333;">insolubleWC</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span><span class="p">,</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC991" class="line" lang="haskell"><span class="n" style="color: #333;">insolubleWC</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span><span class="p">,</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_holes</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">holes</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC992" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">anyBag</span> <span class="n" style="color: #333;">insolubleCt</span> <span class="n" style="color: #333;">simples</span></span>
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958
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993
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<pre style="margin: 0;"> <span id="LC993" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">anyBag</span> <span class="n" style="color: #333;">insolubleImplic</span> <span class="n" style="color: #333;">implics</span></span>
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994
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<pre style="margin: 0;">+<span id="LC994" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">anyBag</span> <span class="n" style="color: #333;">isOutOfScopeHole</span> <span class="n" style="color: #333;">holes</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Insoluble holes]</span></span>
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959
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995
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<pre style="margin: 0;"> <span id="LC995" class="line" lang="haskell"></span>
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960
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996
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<pre style="margin: 0;"> <span id="LC996" class="line" lang="haskell"><span class="n" style="color: #333;">insolubleCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</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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961
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997
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<pre style="margin: 0;"> <span id="LC997" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Definitely insoluble, in particular /excluding/ type-hole constraints</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">@@ -963,7 +999,6 @@ insolubleCt :: Ct -> Bool</td>
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963
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999
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<pre style="margin: 0;"> <span id="LC999" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- b) that is insoluble</span></span>
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964
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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;">-- c) and does not arise from a Given</span></span>
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1001
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<pre style="margin: 0;"> <span id="LC1001" class="line" lang="haskell"><span class="n" style="color: #333;">insolubleCt</span> <span class="n" style="color: #333;">ct</span></span>
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966
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<pre style="margin: 0;">-<span id="LC966" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isHoleCt</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isOutOfScopeCt</span> <span class="n" style="color: #333;">ct</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Insoluble holes]</span></span>
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967
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1002
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<pre style="margin: 0;"> <span id="LC1002" class="line" lang="haskell"> <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;">insolubleEqCt</span> <span class="n" style="color: #333;">ct</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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968
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1003
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<pre style="margin: 0;"> <span id="LC1003" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">arisesFromGivens</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Given insolubles]</span></span>
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969
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1004
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<pre style="margin: 0;"> <span id="LC1004" 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;">True</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">@@ -986,11 +1021,17 @@ insolubleEqCt :: Ct -> Bool</td>
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986
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"><span class="n" style="color: #333;">insolubleEqCt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_status</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">InsolubleCIS</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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987
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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;">insolubleEqCt</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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988
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1023
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<pre style="margin: 0;"> <span id="LC1023" class="line" lang="haskell"></span>
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1024
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<pre style="margin: 0;">+<span id="LC1024" class="line" lang="haskell"><span class="cd">-- | Does this hole represent an "out of scope" error?</span></span>
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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;">-- See Note [Insoluble holes]</span></span>
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1026
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<pre style="margin: 0;">+<span id="LC1026" class="line" lang="haskell"><span class="n" style="color: #333;">isOutOfScopeHole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</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="LC1027" class="line" lang="haskell"><span class="n" style="color: #333;">isOutOfScopeHole</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ</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;">startsWithUnderscore</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1028" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1029" 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;">WantedConstraints</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC990" 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;">WC</span> <span class="p">{</span><span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">s</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">i</span><span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1030" 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;">WC</span> <span class="p">{</span><span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">s</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">i</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_holes</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">h</span></span><span class="p">})</span></span>
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991
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1031
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<pre style="margin: 0;"> <span id="LC1031" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"WC"</span> <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;">vcat</span></span>
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992
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1032
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<pre style="margin: 0;"> <span id="LC1032" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">ppr_bag</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"wc_simple"</span><span class="p">)</span> <span class="n" style="color: #333;">s</span></span>
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<pre style="margin: 0;">-<span id="LC993" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr_bag</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"wc_impl"</span><span class="p">)</span> <span class="n" style="color: #333;">i</span> <span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC1033" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr_bag</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"wc_impl"</span><span class="p">)</span> <span class="n" style="color: #333;">i</span></span>
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<pre style="margin: 0;">+<span id="LC1034" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr_bag</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"wc_holes"</span><span class="p">)</span> <span class="n" style="color: #333;">h</span> <span class="p">])</span></span>
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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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1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_bag</span> <span class="o" style="font-weight: 600;">::</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;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</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;">SDoc</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;">ppr_bag</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">bag</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">@@ -1035,7 +1076,7 @@ Hole constraints that ARE NOT treated as truly insoluble:</td>
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1076
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<pre style="margin: 0;"> <span id="LC1076" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a) type holes, arising from PartialTypeSignatures,</span></span>
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1036
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1077
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<pre style="margin: 0;"> <span id="LC1077" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b) "true" expression holes arising from TypedHoles</span></span>
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1037
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1078
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<pre style="margin: 0;"> <span id="LC1078" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1038" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">An "expression hole" or "type hole" <span class="idiff left right">constraint </span>isn't really an error</span></span>
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1079
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">An "expression hole" or "type hole" isn't really an error</span></span>
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1039
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1080
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<pre style="margin: 0;"> <span id="LC1080" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">at all; it's a report saying "_ :: Int" here. But an out-of-scope</span></span>
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1040
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1081
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variable masquerading as expression holes IS treated as truly</span></span>
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<pre style="margin: 0;"> <span id="LC1082" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">insoluble, so that it trumps other errors during error reporting.</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">@@ -1512,10 +1553,6 @@ ctFlavourRole (CTyEqCan { cc_ev = ev, cc_eq_rel = eq_rel })</td>
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1512
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<pre style="margin: 0;"> <span id="LC1553" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvFlavour</span> <span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="n" style="color: #333;">eq_rel</span><span class="p">)</span></span>
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1513
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1554
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<pre style="margin: 0;"> <span id="LC1554" class="line" lang="haskell"><span class="n" style="color: #333;">ctFlavourRole</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CFunEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span> <span class="p">})</span></span>
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1514
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1555
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<pre style="margin: 0;"> <span id="LC1555" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvFlavour</span> <span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span><span class="p">)</span></span>
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1515
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<pre style="margin: 0;">-<span id="LC1515" class="line" lang="haskell"><span class="n" style="color: #333;">ctFlavourRole</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span> <span class="p">})</span></span>
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1516
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<pre style="margin: 0;">-<span id="LC1516" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvFlavour</span> <span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- NomEq: CHoleCans can be rewritten by</span></span>
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<pre style="margin: 0;">-<span id="LC1517" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- by nominal equalities but empahatically</span></span>
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<pre style="margin: 0;">-<span id="LC1518" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- not by representational equalities</span></span>
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<pre style="margin: 0;"> <span id="LC1556" class="line" lang="haskell"><span class="n" style="color: #333;">ctFlavourRole</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;"> <span id="LC1557" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvFlavourRole</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1558" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#93bba9b9e0195db135fec54160523a427ea042fd"><strong>compiler/GHC/Tc/Types/Origin.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">@@ -427,7 +427,9 @@ data CtOrigin</td>
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<pre style="margin: 0;"> <span id="LC427" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We only need a CtOrigin on the first, because the location</span></span>
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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is pinned on the entire error message</span></span>
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC430" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HoleOrigin</span></span>
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<pre style="margin: 0;">+<span id="LC430" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ExprHoleOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">OccName</span> <span class="c1" style="color: #998; font-style: italic;">-- from an expression hole</span></span>
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<pre style="margin: 0;">+<span id="LC431" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TypeHoleOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">OccName</span> <span class="c1" style="color: #998; font-style: italic;">-- from a type hole (partial type signature)</span></span>
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<pre style="margin: 0;">+<span id="LC432" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PatCheckOrigin</span> <span class="c1" style="color: #998; font-style: italic;">-- normalisation of a type during pattern-match checking</span></span>
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<pre style="margin: 0;"> <span id="LC433" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">UnboundOccurrenceOf</span> <span class="kt" style="color: #458; font-weight: 600;">OccName</span></span>
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<pre style="margin: 0;"> <span id="LC434" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ListOrigin</span> <span class="c1" style="color: #998; font-style: italic;">-- An overloaded list</span></span>
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<pre style="margin: 0;"> <span id="LC435" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">BracketOrigin</span> <span class="c1" style="color: #998; font-style: italic;">-- An overloaded quotation bracket</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">@@ -640,7 +642,9 @@ pprCtO MCompOrigin = text "a statement in a monad comprehension"</td>
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<pre style="margin: 0;"> <span id="LC642" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtO</span> <span class="kt" style="color: #458; font-weight: 600;">ProcOrigin</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a proc expression"</span></span>
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TypeEqOrigin</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</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="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a type equality"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">sep</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t1</span><span class="p">,</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'~'</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t2</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtO</span> <span class="kt" style="color: #458; font-weight: 600;">AnnOrigin</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"an annotation"</span></span>
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<pre style="margin: 0;">-<span id="LC643" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtO</span> <span class="kt" style="color: #458; font-weight: 600;">HoleOrigin</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a use of"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</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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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExprHoleOrigin</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a use of"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TypeHoleOrigin</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a use of wildcard"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtO</span> <span class="kt" style="color: #458; font-weight: 600;">PatCheckOrigin</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a pattern-match completeness check"</span></span>
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<pre style="margin: 0;"> <span id="LC648" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtO</span> <span class="kt" style="color: #458; font-weight: 600;">ListOrigin</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"an overloaded list"</span></span>
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<pre style="margin: 0;"> <span id="LC649" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtO</span> <span class="kt" style="color: #458; font-weight: 600;">StaticOrigin</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a static form"</span></span>
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<pre style="margin: 0;"> <span id="LC650" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtO</span> <span class="kt" style="color: #458; font-weight: 600;">BracketOrigin</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a quotation bracket"</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#c6e4263ee64c68e57b7525127d98243fce38b1ea"><strong>compiler/GHC/Tc/Utils/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">@@ -98,14 +98,14 @@ module GHC.Tc.Utils.Monad(</td>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"> <span class="n" style="color: #333;">chooseUniqueOccTc</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"> <span class="n" style="color: #333;">getConstraintVar</span><span class="p">,</span> <span class="n" style="color: #333;">setConstraintVar</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"> <span class="n" style="color: #333;">emitConstraints</span><span class="p">,</span> <span class="n" style="color: #333;">emitStaticConstraints</span><span class="p">,</span> <span class="n" style="color: #333;">emitSimple</span><span class="p">,</span> <span class="n" style="color: #333;">emitSimples</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC101" class="line" lang="haskell"> <span class="n" style="color: #333;">emitImplication</span><span class="p">,</span> <span class="n" style="color: #333;">emitImplications</span><span class="p">,</span> <span class="n" style="color: #333;">emitInsoluble</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"> <span class="n" style="color: #333;">emitImplication</span><span class="p">,</span> <span class="n" style="color: #333;">emitImplications</span><span class="p">,</span> <span class="n" style="color: #333;">emitInsoluble</span><span class="p">,</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">emitHole</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="haskell"> <span class="n" style="color: #333;">discardConstraints</span><span class="p">,</span> <span class="n" style="color: #333;">captureConstraints</span><span class="p">,</span> <span class="n" style="color: #333;">tryCaptureConstraints</span><span class="p">,</span></span>
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103
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell"> <span class="n" style="color: #333;">pushLevelAndCaptureConstraints</span><span class="p">,</span></span>
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104
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104
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="haskell"> <span class="n" style="color: #333;">pushTcLevelM_</span><span class="p">,</span> <span class="n" style="color: #333;">pushTcLevelM</span><span class="p">,</span> <span class="n" style="color: #333;">pushTcLevelsM</span><span class="p">,</span></span>
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105
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105
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"> <span class="n" style="color: #333;">getTcLevel</span><span class="p">,</span> <span class="n" style="color: #333;">setTcLevel</span><span class="p">,</span> <span class="n" style="color: #333;">isTouchableTcM</span><span class="p">,</span></span>
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106
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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;">getLclTypeEnv</span><span class="p">,</span> <span class="n" style="color: #333;">setLclTypeEnv</span><span class="p">,</span></span>
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107
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107
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"> <span class="n" style="color: #333;">traceTcConstraints</span><span class="p">,</span></span>
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108
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<pre style="margin: 0;">-<span id="LC108" class="line" lang="haskell"> <span class="n" style="color: #333;">emitNamed<span class="idiff left">WildCardHoleConstraints</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">emitAnonWildCardHoleConstraint</span></span><span class="p">,</span></span>
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108
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"> <span class="n" style="color: #333;">emitNamed<span class="idiff left">TypeHole</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">emitAnonTypeHole</span></span><span class="p">,</span></span>
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109
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109
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="haskell"></span>
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110
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110
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Template Haskell context</span></span>
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111
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111
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"> <span class="n" style="color: #333;">recordThUse</span><span class="p">,</span> <span class="n" style="color: #333;">recordThSpliceUse</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">@@ -1569,12 +1569,11 @@ emitInsoluble ct</td>
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1569
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1569
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<pre style="margin: 0;"> <span id="LC1569" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lie_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getConstraintVar</span></span>
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1570
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1570
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<pre style="margin: 0;"> <span id="LC1570" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">updTcRef</span> <span class="n" style="color: #333;">lie_var</span> <span class="p">(`</span><span class="n" style="color: #333;">addInsols</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 class="p">}</span></span>
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1571
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1571
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<pre style="margin: 0;"> <span id="LC1571" class="line" lang="haskell"></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;">emitInsolubles</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1573
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<pre style="margin: 0;">-<span id="LC1573" class="line" lang="haskell"><span class="n" style="color: #333;">emitInsolubles</span> <span class="n" style="color: #333;">cts</span></span>
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1574
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<pre style="margin: 0;">-<span id="LC1574" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1575
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<pre style="margin: 0;">-<span id="LC1575" 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 class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"emitInsolubles"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span></span>
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1576
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<pre style="margin: 0;">-<span id="LC1576" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lie_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getConstraintVar</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;">updTcRef</span> <span class="n" style="color: #333;">lie_var</span> <span class="p">(`</span><span class="n" style="color: #333;">addInsols</span><span class="p">`</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1572" class="line" lang="haskell"><span class="n" style="color: #333;">emitHole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1573
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<pre style="margin: 0;">+<span id="LC1573" class="line" lang="haskell"><span class="n" style="color: #333;">emitHole</span> <span class="n" style="color: #333;">hole</span></span>
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<pre style="margin: 0;">+<span id="LC1574" 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;">traceTc</span> <span class="s" style="color: #d14;">"emitHole"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hole</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1575" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lie_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getConstraintVar</span></span>
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1576
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<pre style="margin: 0;">+<span id="LC1576" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">updTcRef</span> <span class="n" style="color: #333;">lie_var</span> <span class="p">(`</span><span class="n" style="color: #333;">addHole</span><span class="p">`</span> <span class="n" style="color: #333;">hole</span><span class="p">)</span> <span class="p">}</span></span>
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1577
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<pre style="margin: 0;"> <span id="LC1577" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1578" class="line" lang="haskell"><span class="cd">-- | Throw out any constraints emitted by the thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC1579" class="line" lang="haskell"><span class="n" style="color: #333;">discardConstraints</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</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;">TcM</span> <span class="n" style="color: #333;">a</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">@@ -1644,34 +1643,28 @@ traceTcConstraints msg</td>
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1643
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<pre style="margin: 0;"> <span id="LC1643" class="line" lang="haskell"> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="p">(</span><span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">++</span> <span class="s" style="color: #d14;">": LIE:"</span><span class="p">))</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lie</span><span class="p">)</span></span>
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1645
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<pre style="margin: 0;"> <span id="LC1644" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1645" class="line" lang="haskell"></span>
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1647
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<pre style="margin: 0;">-<span id="LC1647" class="line" lang="haskell"><span class="n" style="color: #333;">emitAnonWildCardHoleConstraint</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1648
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<pre style="margin: 0;">-<span id="LC1648" class="line" lang="haskell"><span class="n" style="color: #333;">emitAnonWildCardHoleConstraint</span> <span class="n" style="color: #333;">tv</span></span>
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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="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ct_loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCtLocM</span> <span class="kt" style="color: #458; font-weight: 600;">HoleOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1650
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<pre style="margin: 0;">-<span id="LC1650" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitInsolubles</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unitBag</span> <span class="o" style="font-weight: 600;">$</span></span>
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1651
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<pre style="margin: 0;">-<span id="LC1651" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv</span></span>
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1652
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<pre style="margin: 0;">-<span id="LC1652" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct_loc</span> <span class="p">}</span></span>
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1653
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<pre style="margin: 0;">-<span id="LC1653" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarOcc</span> <span class="s" style="color: #d14;">"_"</span></span>
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<pre style="margin: 0;">-<span id="LC1654" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TypeHole</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1655" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1656" class="line" lang="haskell"><span class="n" style="color: #333;">emitNamedWildCardHoleConstraints</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC1657" class="line" lang="haskell"><span class="n" style="color: #333;">emitNamedWildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs</span></span>
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1658
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<pre style="margin: 0;">-<span id="LC1658" 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;">ct_loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCtLocM</span> <span class="kt" style="color: #458; font-weight: 600;">HoleOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1659
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<pre style="margin: 0;">-<span id="LC1659" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitInsolubles</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>
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1660
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<td class="diff-line-num new_line old" data-linenumber="1646" 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="LC1660" class="line" lang="haskell"> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">do_one</span> <span class="n" style="color: #333;">ct_loc</span><span class="p">)</span> <span class="n" style="color: #333;">wcs</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;">emitAnonTypeHole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1647
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<pre style="margin: 0;">+<span id="LC1647" class="line" lang="haskell"><span class="n" style="color: #333;">emitAnonTypeHole</span> <span class="n" style="color: #333;">tv</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1648" 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">
1648
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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="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ct_loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCtLocM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TypeHoleOrigin</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1649" 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">
1649
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<pre style="margin: 0;">+<span id="LC1649" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_sort</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TypeHole</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1650" 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">
1650
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<pre style="margin: 0;">+<span id="LC1650" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1651" 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">
1651
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<pre style="margin: 0;">+<span id="LC1651" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1652" 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">
1652
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<pre style="margin: 0;">+<span id="LC1652" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct_loc</span> <span class="p">}</span></span>
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1653
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<pre style="margin: 0;">+<span id="LC1653" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitHole</span> <span class="n" style="color: #333;">hole</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="kr" style="font-weight: 600;">where</span></span>
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1655
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<pre style="margin: 0;">+<span id="LC1655" class="line" lang="haskell"> <span class="n" style="color: #333;">occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarOcc</span> <span class="s" style="color: #d14;">"_"</span></span>
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1656
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<pre style="margin: 0;">+<span id="LC1656" class="line" lang="haskell"></span>
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1657
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<pre style="margin: 0;">+<span id="LC1657" class="line" lang="haskell"><span class="n" style="color: #333;">emitNamedTypeHole</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</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;">emitNamedTypeHole</span> <span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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1659
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<pre style="margin: 0;">+<span id="LC1659" 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;">ct_loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="p">(</span><span class="n" style="color: #333;">nameSrcSpan</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1660" 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">
1660
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<pre style="margin: 0;">+<span id="LC1660" class="line" lang="haskell"> <span class="n" style="color: #333;">getCtLocM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TypeHoleOrigin</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1661
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<pre style="margin: 0;">+<span id="LC1661" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_sort</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TypeHole</span></span>
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1662
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<pre style="margin: 0;">+<span id="LC1662" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ</span></span>
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<pre style="margin: 0;">+<span id="LC1663" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;">+<span id="LC1664" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct_loc</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1665" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitHole</span> <span class="n" style="color: #333;">hole</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1666" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1662" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span></span>
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<pre style="margin: 0;">-<span id="LC1663" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one</span> <span class="n" style="color: #333;">ct_loc</span> <span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1664" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;">-<span id="LC1665" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct_loc'</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1666" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occName</span> <span class="n" style="color: #333;">name</span></span>
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<pre style="margin: 0;">-<span id="LC1667" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TypeHole</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1668" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1669" class="line" lang="haskell"> <span class="n" style="color: #333;">real_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;">nameSrcSpan</span> <span class="n" style="color: #333;">name</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC1670" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RealSrcSpan</span> <span class="n" style="color: #333;">span</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">span</span></span>
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1671
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<pre style="margin: 0;">-<span id="LC1671" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UnhelpfulSpan</span> <span class="n" style="color: #333;">str</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"emitNamedWildCardHoleConstraints"</span></span>
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<pre style="margin: 0;">-<span id="LC1672" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ftext</span> <span class="n" style="color: #333;">str</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC1673" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Wildcards are defined locally, and so have RealSrcSpans</span></span>
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<pre style="margin: 0;">-<span id="LC1674" class="line" lang="haskell"> <span class="n" style="color: #333;">ct_loc'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setCtLocSpan</span> <span class="n" style="color: #333;">ct_loc</span> <span class="n" style="color: #333;">real_span</span></span>
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<pre style="margin: 0;">+<span id="LC1667" class="line" lang="haskell"> <span class="n" style="color: #333;">occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nameOccName</span> <span class="n" style="color: #333;">name</span></span>
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<pre style="margin: 0;"> <span id="LC1668" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Constraints and errors]</span></span>
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<pre style="margin: 0;"> <span id="LC1670" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<li id="94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb"><strong>compiler/GHC/Tc/Utils/TcMType.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">@@ -41,10 +41,11 @@ module GHC.Tc.Utils.TcMType (</td>
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<pre style="margin: 0;"> <span id="LC41" 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="LC42" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Creating new evidence variables</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">newEvVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newEvVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newDict</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC44" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">newWanted</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newWanteds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">newHoleCt</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">cloneWanted</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cloneWC</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">newWanted</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newWanteds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cloneWanted</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cloneWC</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">emitWanted</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">emitWantedEq</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">emitWantedEvVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">emitWantedEvVars</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">emitDerivedEqs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">newTcEvBinds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newNoTcEvBinds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addTcEvBind</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">emitNewExprHole</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">newCoercionHole</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">fillCoercionHole</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isFilledCoercionHole</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unpackCoercionHole</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">unpackCoercionHole_maybe</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">@@ -67,7 +68,7 @@ module GHC.Tc.Utils.TcMType (</td>
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<pre style="margin: 0;"> <span id="LC68" 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="LC69" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Zonking and tidying</span></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">zonkTidyTcType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zonkTidyTcTypes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zonkTidyOrigin</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC70" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tidyEvVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tidyCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tidySkolemInfo</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tidyEvVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tidyCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tidy<span class="idiff left">Hole</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">tidy</span>SkolemInfo</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">zonkTcTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zonkTcTyVars</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">zonkTcTyVarToTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zonkTyVarTyVarPairs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">zonkTyCoVarsAndFV</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zonkTcTypeAndFV</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zonkDTyCoVarSetAndFV</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">@@ -193,17 +194,6 @@ newWanted orig t_or_k pty</td>
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193
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="haskell"><span class="n" style="color: #333;">newWanteds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ThetaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span><span class="p">]</span></span>
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194
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="haskell"><span class="n" style="color: #333;">newWanteds</span> <span class="n" style="color: #333;">orig</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;">newWanted</span> <span class="n" style="color: #333;">orig</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span></span>
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195
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196
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<pre style="margin: 0;"> <span id="LC196" class="line" lang="haskell"></span>
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196
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell"><span class="cd">-- | Create a new 'CHoleCan' 'Ct'.</span></span>
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197
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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell"><span class="n" style="color: #333;">newHoleCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HoleSort</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="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span></span>
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198
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<pre style="margin: 0;">-<span id="LC198" class="line" lang="haskell"><span class="n" style="color: #333;">newHoleCt</span> <span class="n" style="color: #333;">hole</span> <span class="n" style="color: #333;">ev</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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<td class="diff-line-num old old_line" data-linenumber="199" 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">
199
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCtLocM</span> <span class="kt" style="color: #458; font-weight: 600;">HoleOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span></span>
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201
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<pre style="margin: 0;">-<span id="LC201" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EvVarDest</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_nosh</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WDeriv</span></span>
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<pre style="margin: 0;">-<span id="LC203" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getOccName</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hole</span> <span class="p">}</span></span>
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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="LC197" 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="LC198" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Cloning constraints</span></span>
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<pre style="margin: 0;"> <span id="LC199" 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">@@ -286,6 +276,18 @@ emitWantedEvVar origin ty</td>
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<pre style="margin: 0;"> <span id="LC276" class="line" lang="haskell"><span class="n" style="color: #333;">emitWantedEvVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcPredType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</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="LC277" class="line" lang="haskell"><span class="n" style="color: #333;">emitWantedEvVars</span> <span class="n" style="color: #333;">orig</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;">emitWantedEvVar</span> <span class="n" style="color: #333;">orig</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC278" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"><span class="cd">-- | Emit a new wanted expression hole</span></span>
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<pre style="margin: 0;">+<span id="LC280" class="line" lang="haskell"><span class="n" style="color: #333;">emitNewExprHole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccName</span> <span class="c1" style="color: #998; font-style: italic;">-- of the hole</span></span>
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<pre style="margin: 0;">+<span id="LC281" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="c1" style="color: #998; font-style: italic;">-- of the evidence</span></span>
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<pre style="margin: 0;">+<span id="LC282" 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="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC283" class="line" lang="haskell"><span class="n" style="color: #333;">emitNewExprHole</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">ev_id</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC284" 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;">loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCtLocM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExprHoleOrigin</span> <span class="n" style="color: #333;">occ</span><span class="p">)</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;">TypeLevel</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC285" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_sort</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExprHole</span> <span class="n" style="color: #333;">ev_id</span></span>
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<pre style="margin: 0;">+<span id="LC286" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getOccName</span> <span class="n" style="color: #333;">ev_id</span></span>
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<pre style="margin: 0;">+<span id="LC287" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_ty</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="LC288" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hole_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitHole</span> <span class="n" style="color: #333;">hole</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC290" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC291" class="line" lang="haskell"><span class="n" style="color: #333;">newDict</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">DictId</span></span>
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<pre style="margin: 0;"> <span id="LC292" class="line" lang="haskell"><span class="n" style="color: #333;">newDict</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC293" 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;">name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newSysName</span> <span class="p">(</span><span class="n" style="color: #333;">mkDictOcc</span> <span class="p">(</span><span class="n" style="color: #333;">getOccName</span> <span class="n" style="color: #333;">cls</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">@@ -2002,21 +2004,28 @@ zonkWC :: WantedConstraints -> TcM WantedConstraints</td>
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<pre style="margin: 0;"> <span id="LC2004" class="line" lang="haskell"><span class="n" style="color: #333;">zonkWC</span> <span class="n" style="color: #333;">wc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zonkWCRec</span> <span class="n" style="color: #333;">wc</span></span>
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2003
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2005
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<pre style="margin: 0;"> <span id="LC2005" class="line" lang="haskell"></span>
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2006
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<pre style="margin: 0;"> <span id="LC2006" class="line" lang="haskell"><span class="n" style="color: #333;">zonkWCRec</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;">-<span id="LC2005" class="line" lang="haskell"><span class="n" style="color: #333;">zonkWCRec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simple</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implic</span> <span class="p">})</span></span>
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2007
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<pre style="margin: 0;">+<span id="LC2007" class="line" lang="haskell"><span class="n" style="color: #333;">zonkWCRec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simple</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implic</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_holes</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">holes</span></span> <span class="p">})</span></span>
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2006
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2008
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<pre style="margin: 0;"> <span id="LC2008" 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;">simple'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkSimples</span> <span class="n" style="color: #333;">simple</span></span>
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2007
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2009
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<pre style="margin: 0;"> <span id="LC2009" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">implic'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapBagM</span> <span class="n" style="color: #333;">zonkImplication</span> <span class="n" style="color: #333;">implic</span></span>
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2008
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<pre style="margin: 0;">-<span id="LC2008" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simple'</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implic'</span> <span class="p">})</span> <span class="p">}</span></span>
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2010
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<pre style="margin: 0;">+<span id="LC2010" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">holes'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapBagM</span> <span class="n" style="color: #333;">zonkHole</span> <span class="n" style="color: #333;">holes</span></span>
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2011
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<pre style="margin: 0;">+<span id="LC2011" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simple'</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implic'</span><span class="p">,</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">holes'</span> <span class="p">})</span> <span class="p">}</span></span>
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2009
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2012
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<pre style="margin: 0;"> <span id="LC2012" class="line" lang="haskell"></span>
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2010
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2013
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<pre style="margin: 0;"> <span id="LC2013" class="line" lang="haskell"><span class="n" style="color: #333;">zonkSimples</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span></span>
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2011
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2014
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<pre style="margin: 0;"> <span id="LC2014" class="line" lang="haskell"><span class="n" style="color: #333;">zonkSimples</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 class="p">{</span> <span class="n" style="color: #333;">cts'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapBagM</span> <span class="n" style="color: #333;">zonkCt</span> <span class="n" style="color: #333;">cts</span></span>
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2012
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2015
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<pre style="margin: 0;"> <span id="LC2015" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"zonkSimples done:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cts'</span><span class="p">)</span></span>
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2013
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2016
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<pre style="margin: 0;"> <span id="LC2016" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">cts'</span> <span class="p">}</span></span>
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2014
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2017
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<pre style="margin: 0;"> <span id="LC2017" class="line" lang="haskell"></span>
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2018
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<pre style="margin: 0;">+<span id="LC2018" class="line" lang="haskell"><span class="n" style="color: #333;">zonkHole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span></span>
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2019
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<pre style="margin: 0;">+<span id="LC2019" class="line" lang="haskell"><span class="n" style="color: #333;">zonkHole</span> <span class="n" style="color: #333;">hole</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span> <span class="p">})</span></span>
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2020
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<pre style="margin: 0;">+<span id="LC2020" 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;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">ty</span></span>
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2021
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<pre style="margin: 0;">+<span id="LC2021" 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;">hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty'</span> <span class="p">})</span> <span class="p">}</span></span>
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2022
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<pre style="margin: 0;">+<span id="LC2022" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- No need to zonk the Id in any ExprHole because we never look at it</span></span>
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2023
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<pre style="margin: 0;">+<span id="LC2023" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- until after the final zonk and desugaring</span></span>
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2024
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<pre style="margin: 0;">+<span id="LC2024" class="line" lang="haskell"></span>
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2015
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2025
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<pre style="margin: 0;"> <span id="LC2025" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [zonkCt behaviour]</span></span>
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2016
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2026
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<pre style="margin: 0;"> <span id="LC2026" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2017
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2027
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<pre style="margin: 0;"> <span id="LC2027" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">zonkCt tries to maintain the canonical form of a Ct. For example,</span></span>
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2018
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2028
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<pre style="margin: 0;"> <span id="LC2028" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - a CDictCan should stay a CDictCan;</span></span>
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2019
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<pre style="margin: 0;">-<span id="LC2019" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - a CHoleCan should stay a CHoleCan</span></span>
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2020
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2029
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<pre style="margin: 0;"> <span id="LC2029" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - a CIrredCan should stay a CIrredCan with its cc_status flag intact</span></span>
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2021
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2030
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<pre style="margin: 0;"> <span id="LC2030" class="line" lang="haskell"></span>
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2022
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2031
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<pre style="margin: 0;"> <span id="LC2031" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why?, for example:</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2035" 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">@@ -2026,8 +2035,6 @@ Why?, for example:</td>
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2026
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2035
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<pre style="margin: 0;"> <span id="LC2035" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> don't preserve a canonical form, @expandSuperClasses@ fails to expand</span></span>
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2027
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2036
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<pre style="margin: 0;"> <span id="LC2036" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> superclasses. This is what happened in #11525.</span></span>
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2028
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2037
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<pre style="margin: 0;"> <span id="LC2037" class="line" lang="haskell"></span>
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2029
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<pre style="margin: 0;">-<span id="LC2029" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- For CHoleCan, once we forget that it's a hole, we can never recover that info.</span></span>
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2030
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<pre style="margin: 0;">-<span id="LC2030" class="line" lang="haskell"></span>
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2031
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2038
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<pre style="margin: 0;"> <span id="LC2038" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- For CIrredCan we want to see if a constraint is insoluble with insolubleWC</span></span>
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2032
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2039
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<pre style="margin: 0;"> <span id="LC2039" class="line" lang="haskell"></span>
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2033
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2040
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<pre style="margin: 0;"> <span id="LC2040" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">On the other hand, we change CTyEqCan to CNonCanonical, because of all of</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2053" 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">@@ -2046,10 +2053,6 @@ creates e.g. a CDictCan where the cc_tyars are /not/ function free.</td>
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2046
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2053
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<pre style="margin: 0;"> <span id="LC2053" class="line" lang="haskell"></span>
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2047
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2054
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<pre style="margin: 0;"> <span id="LC2054" class="line" lang="haskell"><span class="n" style="color: #333;">zonkCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span></span>
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2048
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2055
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<pre style="margin: 0;"> <span id="LC2055" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [zonkCt behaviour]</span></span>
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2049
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<pre style="margin: 0;">-<span id="LC2049" class="line" lang="haskell"><span class="n" style="color: #333;">zonkCt</span> <span class="n" style="color: #333;">ct</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span> <span class="p">})</span></span>
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2050
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<pre style="margin: 0;">-<span id="LC2050" 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;">ev'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkCtEvidence</span> <span class="n" style="color: #333;">ev</span></span>
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2051
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<pre style="margin: 0;">-<span id="LC2051" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ct</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev'</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2052" class="line" lang="haskell"></span>
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2056
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<pre style="margin: 0;"> <span id="LC2056" class="line" lang="haskell"><span class="n" style="color: #333;">zonkCt</span> <span class="n" style="color: #333;">ct</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CDictCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="n" style="color: #333;">cc_tyargs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args</span> <span class="p">})</span></span>
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2057
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<pre style="margin: 0;"> <span id="LC2057" 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;">ev'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkCtEvidence</span> <span class="n" style="color: #333;">ev</span></span>
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2058
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<pre style="margin: 0;"> <span id="LC2058" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">args'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">args</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">@@ -2262,17 +2265,15 @@ zonkTidyOrigin env orig = return (env, orig)</td>
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2265
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<pre style="margin: 0;"> <span id="LC2265" class="line" lang="haskell"><span class="n" style="color: #333;">tidyCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span></span>
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2266
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<pre style="margin: 0;"> <span id="LC2266" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used only in error reporting</span></span>
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2267
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<pre style="margin: 0;"> <span id="LC2267" class="line" lang="haskell"><span class="n" style="color: #333;">tidyCt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC2265" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidy_ev</span> <span class="n" style="color: #333;"><span class="idiff left">env</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2268" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidy_ev</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2269" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC2267" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_ev</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TidyEnv</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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<pre style="margin: 0;">+<span id="LC2270" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_ev</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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<pre style="margin: 0;"> <span id="LC2271" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: we do not tidy the ctev_evar field because we don't</span></span>
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<pre style="margin: 0;"> <span id="LC2272" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- show it in error messages</span></span>
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<pre style="margin: 0;">-<span id="LC2270" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_ev</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ctev</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtGiven</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC2271" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctev</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidyType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">pred</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2272" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_ev</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ctev</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC2273" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctev</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidyType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">pred</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2274" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_ev</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ctev</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC2275" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctev</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidyType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">pred</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2273" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_ev</span> <span class="n" style="color: #333;">ctev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctev</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidyType</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">ctev_pred</span> <span class="n" style="color: #333;">ctev</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2274" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2275" class="line" lang="haskell"><span class="n" style="color: #333;">tidyHole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span></span>
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<pre style="margin: 0;">+<span id="LC2276" class="line" lang="haskell"><span class="n" style="color: #333;">tidyHole</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">h</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">h</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidyType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2277" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2278" 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="LC2279" class="line" lang="haskell"><span class="n" style="color: #333;">tidyEvVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EvVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EvVar</span></span>
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<li id="2430cf6bd49f7c94008b89548971a935c1b1cd77">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#2430cf6bd49f7c94008b89548971a935c1b1cd77"><strong>testsuite/tests/partial-sigs/should_compile/SplicesUsed.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">@@ -34,7 +34,7 @@ SplicesUsed.hs:10:16: warning: [-Wpartial-type-signatures (in -Wdefault)]</td>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="plaintext"> In the type signature: charA :: a -> (_)</span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="plaintext">SplicesUsed.hs:13:13: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
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<pre style="margin: 0;">-<span id="LC37" class="line" lang="plaintext"> • Found type wildcard ‘_’ standing for ‘<span class="idiff left right">a -> Bool</span>’</span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="plaintext"> • Found type wildcard ‘_’ standing for ‘<span class="idiff left right">[a]</span>’</span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext"> Where: ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext"> the inferred type of filter' :: (a -> Bool) -> [a] -> [a]</span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext"> at SplicesUsed.hs:14:1-16</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">@@ -50,7 +50,7 @@ SplicesUsed.hs:13:13: warning: [-Wpartial-type-signatures (in -Wdefault)]</td>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext"> In the type signature: filter' :: (_ -> _ -> _)</span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="plaintext">SplicesUsed.hs:13:13: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
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<pre style="margin: 0;">-<span id="LC53" class="line" lang="plaintext"> • Found type wildcard ‘_’ standing for ‘<span class="idiff left right">[a]</span>’</span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="plaintext"> • Found type wildcard ‘_’ standing for ‘<span class="idiff left right">a -> Bool</span>’</span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext"> Where: ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="plaintext"> the inferred type of filter' :: (a -> Bool) -> [a] -> [a]</span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="plaintext"> at SplicesUsed.hs:14:1-16</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">@@ -58,26 +58,26 @@ SplicesUsed.hs:13:13: warning: [-Wpartial-type-signatures (in -Wdefault)]</td>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext"> In the type signature: filter' :: (_ -> _ -> _)</span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext">SplicesUsed.hs:16:2: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
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<pre style="margin: 0;">-<span id="LC61" class="line" lang="plaintext"> • Found type wildcard ‘_’ standing for ‘<span class="idiff left right">Eq a</span>’</span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="plaintext"> • Found type wildcard ‘_’ standing for ‘<span class="idiff left right">a -> a -> Bool</span>’</span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="plaintext"> Where: ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="plaintext"> the inferred type of foo :: Eq a => a -> a -> Bool</span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="plaintext"> at SplicesUsed.hs:16:2-11</span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="plaintext"> • In the type signature: foo :: _ => _</span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="plaintext">SplicesUsed.hs:16:2: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
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<pre style="margin: 0;">-<span id="LC68" class="line" lang="plaintext"> • Found type wildcard ‘_’ standing for ‘<span class="idiff left right">a -> a -> Bool</span>’</span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="plaintext"> • Found type wildcard ‘_’ standing for ‘<span class="idiff left right">Eq a</span>’</span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="plaintext"> Where: ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="plaintext"> the inferred type of foo :: Eq a => a -> a -> Bool</span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="plaintext"> at SplicesUsed.hs:16:2-11</span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="plaintext"> • In the type signature: foo :: _ => _</span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC74" class="line" lang="plaintext">SplicesUsed.hs:18:2: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
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<pre style="margin: 0;">-<span id="LC75" class="line" lang="plaintext"> • Found type wildcard ‘_a’ standing for ‘Bool’</span>
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<pre style="margin: 0;">-<span id="LC76" class="line" lang="plaintext"> • In the type signature: bar :: _a -> _b -> (_a, _b)</span>
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<pre style="margin: 0;">-<span id="LC77" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="plaintext">SplicesUsed.hs:18:2: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="plaintext"> • Found type wildcard ‘_b’ standing for ‘_’</span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="plaintext"> Where: ‘_’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="plaintext"> the inferred type of bar :: Bool -> _ -> (Bool, _)</span>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="plaintext"> at SplicesUsed.hs:18:2-11</span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="plaintext"> • In the type signature: bar :: _a -> _b -> (_a, _b)</span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="plaintext">SplicesUsed.hs:18:2: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="plaintext"> • Found type wildcard ‘_a’ standing for ‘Bool’</span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="plaintext"> • In the type signature: bar :: _a -> _b -> (_a, _b)</span></pre>
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<li id="57693ae880b4d4609bd2d8f0fb6f13038ffa4938">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#57693ae880b4d4609bd2d8f0fb6f13038ffa4938"><strong>testsuite/tests/plugins/hole-fit-plugin/HoleFitPlugin.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 +3,6 @@ module HoleFitPlugin where</td>
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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="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Plugins</span> <span class="k" style="font-weight: 600;">hiding</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="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Errors.Hole</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="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">stripPrefix</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">sortOn</span><span class="p">)</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="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Constraint</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">@@ -34,7 +32,7 @@ fromModule (GreHFCand gre) =</td>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"><span class="n" style="color: #333;">fromModule</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;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="n" style="color: #333;">toHoleFitCommand</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypedHole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">String</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;">String</span></span>
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<pre style="margin: 0;">-<span id="LC37" class="line" lang="haskell"><span class="n" style="color: #333;">toHoleFitCommand</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TyH</span></span><span class="p"><span class="idiff">{</span></span><span class="n" style="color: #333;"><span class="idiff">tyHCt</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">Just</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">CHoleCan</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">h</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff right">)}</span></span> <span class="n" style="color: #333;">str</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="n" style="color: #333;">toHoleFitCommand</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TypedHole</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="n" style="color: #333;"><span class="idiff">th_hole</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">Just</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">Hole</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">hole_occ</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">h</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">})})</span></span> <span class="n" style="color: #333;">str</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">stripPrefix</span> <span class="p">(</span><span class="s" style="color: #d14;">"_"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">str</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">occNameString</span> <span class="n" style="color: #333;">h</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="n" style="color: #333;">toHoleFitCommand</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="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#a2ebc58a8a04e3d568778d697d697c73fc174dfa"><strong>testsuite/tests/th/T12411.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">@@ -2,7 +2,7 @@</td>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T12411.hs:4:6: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> Variable not in scope:</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> (@)</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> :: (a<span class="idiff left right">0 -> f0 a0</span>) -> t0 -> Language.Haskell.TH.Lib.Internal.DecsQ</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> :: (a<span class="idiff left right">1 -> f0 a1</span>) -> t0 -> Language.Haskell.TH.Lib.Internal.DecsQ</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext">T12411.hs:4:7: error:</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> Data constructor not in scope: Q :: [a<span class="idiff left right">1</span>] -> t0</span></pre>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> Data constructor not in scope: Q :: [a<span class="idiff left right">0</span>] -> t0</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8147d941e5ba8ff25b8f047580c82ead5d331e8c#20113928cc39af49e4c89479c9a680c352e8e69f"><strong>testsuite/tests/typecheck/should_fail/T12589.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">T12589.hs:13:3: error: Variable not in scope: (&) :: t<span class="idiff left right">1 -> t0</span> -> t</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T12589.hs:13:3: error: Variable not in scope: (&) :: t<span class="idiff left right">0 -> t1</span> -> t</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext">T12589.hs:13:5: error:</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> • Cannot instantiate unification variable ‘t<span class="idiff left right">0</span>’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • Cannot instantiate unification variable ‘t<span class="idiff left right">1</span>’</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> with a type involving polytypes:</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> (forall a. Bounded a => f0 a) -> h0 f0 xs0</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> GHC doesn't yet support impredicative polymorphism</span>
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