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<h3>
Sebastian Graf pushed to branch wip/pmcheck-refuts
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/b8dd271855dde17a19553412e9e817195c2b5362">b8dd2718</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-06-04T22:19:16Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TmOracle: Replace negative term equalities by refutable PmAltCons
The `PmExprEq` business was a huge hack and was at the same time vastly
too powerful and not powerful enough to encode negative term equalities,
i.e. facts of the form "forall y. x ≁ Just y".
This patch introduces the concept of 'refutable shapes': What matters
for the pattern match checker is being able to encode knowledge of the
kind "x can no longer be the literal 5". We encode this knowledge in a
`PmRefutEnv`, mapping a set of newly introduced `PmAltCon`s (which are
just `PmLit`s at the moment) to each variable denoting above
inequalities.
So, say we have `x ≁ 42 ∈ refuts` in the term oracle context and
try to solve an equality like `x ~ 42`. The entry in the refutable
environment will immediately lead to a contradiction.
This machinery renders the whole `PmExprEq` and `ComplexEq` business
unnecessary, getting rid of a lot of (mostly dead) code.
See the Note [Refutable shapes] in TmOracle for a place to start.
Metric Decrease:
T11195
</pre>
</li>
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<h4>15 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#49d2d51d42e9c209de33c35681b9c9b1e912cda9">
compiler/basicTypes/NameEnv.hs
</a>
</li>
<li class="file-stats">
<a href="#bd37d71fa68b0980d832d992b427fd6a6bdb891d">
compiler/deSugar/Check.hs
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<li class="file-stats">
<a href="#cdd7bc06da6b3eab3e2072ece6294a7f54808f28">
compiler/deSugar/DsMonad.hs
</a>
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<li class="file-stats">
<a href="#7589abbc710cc40f6e48245c2bc16d69f556b714">
compiler/deSugar/PmExpr.hs
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</li>
<li class="file-stats">
<a href="#584407121afc66978c814dbdb5c252118d27656a">
<span class="new-file">
+
compiler/deSugar/PmPpr.hs
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<li class="file-stats">
<a href="#379674a5063221cec43f0f659c2eb67b30339f45">
compiler/deSugar/TmOracle.hs
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<li class="file-stats">
<a href="#0f33fd88c617246c7f89c4477d2d1d24f942df23">
compiler/ghc.cabal.in
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<li class="file-stats">
<a href="#89165943f253c43100bca06548eba40ff0519ca5">
compiler/typecheck/TcEvidence.hs
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<li class="file-stats">
<a href="#d2ddf5ce2d076f8584d9825af8ea0d7ea0a38813">
compiler/typecheck/TcRnTypes.hs
</a>
</li>
<li class="file-stats">
<a href="#2cbc08c5f3b1dcbc9c763a836b51491224c05e50">
compiler/utils/ListSetOps.hs
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<li class="file-stats">
<a href="#f5ceb0b7241ce85056c2d6adcebc29def2f0160d">
<span class="new-file">
+
testsuite/tests/pmcheck/should_compile/CyclicSubst.hs
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</a>
</li>
<li class="file-stats">
<a href="#ee1c3a4519d8bb6d9bff9f229a7c6364a9d2f3a9">
<span class="new-file">
+
testsuite/tests/pmcheck/should_compile/PmExprVars.hs
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</a>
</li>
<li class="file-stats">
<a href="#96035123df876ad65bdcca4979d7aee721637509">
<span class="new-file">
+
testsuite/tests/pmcheck/should_compile/T12949.hs
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<li class="file-stats">
<a href="#a52966ece03f9e76a93a2c4ea96b9fb25368723d">
testsuite/tests/pmcheck/should_compile/all.T
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</li>
<li class="file-stats">
<a href="#3be62e19effdae9d8c3e1d67dadcd219b365dcb5">
testsuite/tests/typecheck/should_compile/T5490.stderr
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</li>
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<h4>Changes:</h4>
<li id="49d2d51d42e9c209de33c35681b9c9b1e912cda9">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/b8dd271855dde17a19553412e9e817195c2b5362#49d2d51d42e9c209de33c35681b9c9b1e912cda9"><strong>compiler/basicTypes/NameEnv.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="25" 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">@@ -25,6 +25,7 @@ module NameEnv (</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"></span>
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<td class="diff-line-num new_line" data-linenumber="26" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">emptyDNameEnv</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">lookupDNameEnv</span><span class="p">,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="28" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">delFromDNameEnv</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="28" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="29" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mapDNameEnv</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="29" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">alterDNameEnv</span><span class="p">,</span></span>
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<td class="diff-line-num new_line" data-linenumber="31" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Dependency analysis</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="147" 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="148" 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">@@ -147,6 +148,9 @@ emptyDNameEnv = emptyUDFM</td>
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<td class="diff-line-num new_line" data-linenumber="148" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"><span class="n" style="color: #333;">lookupDNameEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DNameEnv</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;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span></span>
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<td class="diff-line-num old_line" data-linenumber="148" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="haskell"><span class="n" style="color: #333;">lookupDNameEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupUDFM</span></span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="151" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"><span class="n" style="color: #333;">delFromDNameEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DNameEnv</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;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DNameEnv</span> <span class="n" style="color: #333;">a</span></span>
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<td class="diff-line-num new new_line" data-linenumber="152" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"><span class="n" style="color: #333;">delFromDNameEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">delFromUDFM</span></span>
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<td class="diff-line-num new new_line" data-linenumber="153" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"><span class="n" style="color: #333;">mapDNameEnv</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="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DNameEnv</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;">DNameEnv</span> <span class="n" style="color: #333;">b</span></span>
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<td class="diff-line-num old_line" data-linenumber="151" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="haskell"><span class="n" style="color: #333;">mapDNameEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapUDFM</span></span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/b8dd271855dde17a19553412e9e817195c2b5362#bd37d71fa68b0980d832d992b427fd6a6bdb891d"><strong>compiler/deSugar/Check.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -25,6 +25,7 @@ module Check (</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GhcPrelude</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TmOracle</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">PmPpr</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Unify</span><span class="p">(</span> <span class="n" style="color: #333;">tcMatchTy</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">HsSyn</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">@@ -579,7 +580,7 @@ pmTopNormaliseType_maybe env ty_cs typ</td>
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="haskell"><span class="n" style="color: #333;">pmInitialTmTyCs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmM</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span></span>
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="haskell"><span class="n" style="color: #333;">pmInitialTmTyCs</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="LC582" class="line" lang="haskell"> <span class="n" style="color: #333;">ty_cs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">liftD</span> <span class="n" style="color: #333;">getDictsDs</span></span>
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<pre style="margin: 0;">-<span id="LC582" class="line" lang="haskell"> <span class="n" style="color: #333;">tm_cs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">map</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">toComplex</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="n" style="color: #333;">bagToList</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">liftD</span> <span class="n" style="color: #333;">getTmCsDs</span></span>
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="haskell"> <span class="n" style="color: #333;">tm_cs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bagToList</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">liftD</span> <span class="n" style="color: #333;">getTmCsDs</span></span>
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell"> <span class="n" style="color: #333;">sat_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tyOracle</span> <span class="n" style="color: #333;">ty_cs</span></span>
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585
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<pre style="margin: 0;"> <span id="LC585" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">initTyCs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">sat_ty</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">ty_cs</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">emptyBag</span></span>
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<pre style="margin: 0;"> <span id="LC586" class="line" lang="haskell"> <span class="n" style="color: #333;">initTmState</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="n" style="color: #333;">initialTmState</span> <span class="p">(</span><span class="n" style="color: #333;">tmOracle</span> <span class="n" style="color: #333;">initialTmState</span> <span class="n" style="color: #333;">tm_cs</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">@@ -627,7 +628,7 @@ that we expect.</td>
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell"><span class="n" style="color: #333;">pmIsSatisfiable</span></span>
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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The ambient term and type constraints</span></span>
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<pre style="margin: 0;"> <span id="LC630" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (known to be satisfiable).</span></span>
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<pre style="margin: 0;">-<span id="LC630" 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">ComplexEq</span></span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The new term constraint.</span></span>
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<pre style="margin: 0;">+<span id="LC631" 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">TmVarCt</span></span><span class="idiff right"> </span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The new term constraint.</span></span>
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">EvVar</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The new type constraints.</span></span>
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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The strict argument types.</span></span>
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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</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">@@ -653,7 +654,7 @@ pmIsSatisfiable amb_cs new_tm_c new_ty_cs strict_arg_tys = do</td>
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<pre style="margin: 0;"> <span id="LC654" class="line" lang="haskell"><span class="n" style="color: #333;">tmTyCsAreSatisfiable</span></span>
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<pre style="margin: 0;"> <span id="LC655" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The ambient term and type constraints</span></span>
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<pre style="margin: 0;"> <span id="LC656" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (known to be satisfiable).</span></span>
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<pre style="margin: 0;">-<span id="LC656" 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">ComplexEq</span></span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The new term constraint.</span></span>
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<pre style="margin: 0;">+<span id="LC657" 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">TmVarCt</span></span><span class="idiff right"> </span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The new term constraint.</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="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">EvVar</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The new type constraints.</span></span>
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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span><span class="p">)</span></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;">-- ^ @'Just' delta@ if the constraints (@delta@) are</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1463,7 +1464,7 @@ pmPatType PmFake = pmPatType truePattern</td>
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<pre style="margin: 0;"> <span id="LC1464" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">InhabitationCandidate</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC1465" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">InhabitationCandidate</span></span>
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<pre style="margin: 0;"> <span id="LC1466" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">ic_val_abs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ValAbs</span></span>
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<pre style="margin: 0;">-<span id="LC1466" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ic_tm_ct</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">ComplexEq</span></span></span>
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<pre style="margin: 0;">+<span id="LC1467" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ic_tm_ct</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TmVarCt</span></span></span>
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<pre style="margin: 0;"> <span id="LC1468" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ic_ty_cs</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;">EvVar</span></span>
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1469
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<pre style="margin: 0;"> <span id="LC1469" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ic_strict_arg_tys</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>
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1470
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<pre style="margin: 0;"> <span id="LC1470" 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">@@ -1660,7 +1661,7 @@ mkOneConFull x con = do</td>
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<pre style="margin: 0;"> <span id="LC1661" class="line" lang="haskell"> <span class="n" style="color: #333;">strict_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterByList</span> <span class="n" style="color: #333;">arg_is_banged</span> <span class="n" style="color: #333;">arg_tys'</span></span>
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1662
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<pre style="margin: 0;"> <span id="LC1662" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">InhabitationCandidate</span></span>
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1663
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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;">ic_val_abs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">con_abs</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;">ic_tm_ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmExprVar</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">idName</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">vaToPmExpr</span> <span class="n" style="color: #333;">con_abs</span><span class="p">)</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;">ic_tm_ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TVC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">(</span></span><span class="n" style="color: #333;">vaToPmExpr</span> <span class="n" style="color: #333;">con_abs</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;">ic_ty_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">evvars</span></span>
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1666
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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;">ic_strict_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">strict_arg_tys</span></span>
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1667
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<pre style="margin: 0;"> <span id="LC1667" 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">@@ -1678,21 +1679,15 @@ mkGuard pv e = do</td>
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1679
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<pre style="margin: 0;"> <span id="LC1679" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">PmFake</span></span>
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1680
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<pre style="margin: 0;"> <span id="LC1680" 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;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGrd</span> <span class="n" style="color: #333;">pv</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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1681
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<pre style="margin: 0;"> <span id="LC1681" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1681" class="line" lang="haskell"><span class="cd">-- | Create a term equality of the form: `(False ~ (x ~ lit))`</span></span>
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1682
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<pre style="margin: 0;">-<span id="LC1682" class="line" lang="haskell"><span class="n" style="color: #333;">mkNegEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span></span>
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<pre style="margin: 0;">-<span id="LC1683" class="line" lang="haskell"><span class="n" style="color: #333;">mkNegEq</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">falsePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1684" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE mkNegEq #-}</span></span>
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<pre style="margin: 0;">-<span id="LC1685" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1682" class="line" lang="haskell"><span class="cd">-- | Create a term equality of the form: `(x ~ lit)`</span></span>
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1687
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<pre style="margin: 0;">-<span id="LC1687" class="line" lang="haskell"><span class="n" style="color: #333;">mkPosEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">ComplexEq</span></span></span>
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<pre style="margin: 0;">-<span id="LC1688" class="line" lang="haskell"><span class="n" style="color: #333;">mkPosEq</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">=</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmExprVar</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">idName</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1683" class="line" lang="haskell"><span class="n" style="color: #333;">mkPosEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TmVarCt</span></span></span>
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1684
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<pre style="margin: 0;">+<span id="LC1684" class="line" lang="haskell"><span class="n" style="color: #333;">mkPosEq</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TVC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">(</span></span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1685" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE mkPosEq #-}</span></span>
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1686
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<pre style="margin: 0;"> <span id="LC1686" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1687" class="line" lang="haskell"><span class="cd">-- | Create a term equality of the form: `(x ~ x)`</span></span>
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<pre style="margin: 0;"> <span id="LC1688" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (always discharged by the term oracle)</span></span>
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<pre style="margin: 0;">-<span id="LC1693" class="line" lang="haskell"><span class="n" style="color: #333;">mkIdEq</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;">ComplexEq</span></span>
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<pre style="margin: 0;">-<span id="LC1694" class="line" lang="haskell"><span class="n" style="color: #333;">mkIdEq</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">name</span><span class="p">)</span></span>
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1695
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<pre style="margin: 0;">-<span id="LC1695" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC1689" class="line" lang="haskell"><span class="n" style="color: #333;">mkIdEq</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;">TmVarCt</span></span>
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<pre style="margin: 0;">+<span id="LC1690" class="line" lang="haskell"><span class="n" style="color: #333;">mkIdEq</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TVC</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">x</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC1691" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE mkIdEq #-}</span></span>
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<pre style="margin: 0;"> <span id="LC1692" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1693" class="line" lang="haskell"><span class="cd">-- | Generate a variable pattern of a given type</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2059,8 +2054,7 @@ pmcheckHd :: Pattern -> PatVec -> [PatVec] -> ValAbs -> ValVec</td>
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<pre style="margin: 0;"> <span id="LC2054" class="line" lang="haskell"></span>
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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;">-- Var</span></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;">pmcheckHd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">ps</span> <span class="n" style="color: #333;">guards</span> <span class="n" style="color: #333;">va</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="n" style="color: #333;">vva</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2062" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tm_state</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveOneEq</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2063" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">x</span><span class="p">),</span> <span class="n" style="color: #333;">vaToPmExpr</span> <span class="n" style="color: #333;">va</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="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tm_state</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveOneEq</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TVC</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="n" style="color: #333;">vaToPmExpr</span> <span class="n" style="color: #333;">va</span><span class="p">))</span></span>
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2064
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<td class="diff-line-num new_line" data-linenumber="2058" 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">
2058
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<pre style="margin: 0;"> <span id="LC2058" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ucon</span> <span class="n" style="color: #333;">va</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">pmcheckI</span> <span class="n" style="color: #333;">ps</span> <span class="n" style="color: #333;">guards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="n" style="color: #333;">vva</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span> <span class="p">{</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tm_state</span><span class="p">}))</span></span>
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2065
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<td class="diff-line-num new_line" data-linenumber="2059" 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">
2059
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<pre style="margin: 0;"> <span id="LC2059" 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;">return</span> <span class="n" style="color: #333;">mempty</span></span>
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2066
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2060
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<pre style="margin: 0;"> <span id="LC2060" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2116" 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">@@ -2122,7 +2116,8 @@ pmcheckHd (p@(PmLit l)) ps guards (PmVar x) (ValVec vva delta)</td>
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2122
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2116
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<pre style="margin: 0;"> <span id="LC2116" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="n" style="color: #333;">vva</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span> <span class="p">{</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tm_state</span><span class="p">})</span></span>
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2123
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<td class="diff-line-num new_line" data-linenumber="2117" 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">
2117
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<pre style="margin: 0;"> <span id="LC2117" 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;">return</span> <span class="n" style="color: #333;">mempty</span></span>
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2124
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2118
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<pre style="margin: 0;"> <span id="LC2118" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2125
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<td class="diff-line-num new_line old" data-linenumber="2119" 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="LC2125" class="line" lang="haskell"> <span class="n" style="color: #333;">us</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;">tm_state</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveOneEq</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">mkNegEq</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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2119
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<pre style="margin: 0;">+<span id="LC2119" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Refutable shapes] in TmOracle</span></span>
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2120
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<pre style="margin: 0;">+<span id="LC2120" class="line" lang="haskell"> <span class="n" style="color: #333;">us</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;">tm_state</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addSolveRefutableAltCon</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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2126
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2121
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<pre style="margin: 0;"> <span id="LC2121" 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;">ValVec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNLit</span> <span class="n" style="color: #333;">x</span> <span class="p">[</span><span class="n" style="color: #333;">l</span><span class="p">]</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">vva</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span> <span class="p">{</span> <span class="n" style="color: #333;">delta_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tm_state</span> <span class="p">})]</span></span>
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2127
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2122
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<pre style="margin: 0;"> <span id="LC2122" 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;">[]</span></span>
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2128
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2123
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<pre style="margin: 0;"> <span id="LC2123" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2137" 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">@@ -2142,7 +2137,8 @@ pmcheckHd (p@(PmLit l)) ps guards</td>
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2142
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2137
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<pre style="margin: 0;"> <span id="LC2137" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="n" style="color: #333;">vva</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span> <span class="p">{</span> <span class="n" style="color: #333;">delta_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tm_state</span> <span class="p">}))</span></span>
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2143
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2138
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<pre style="margin: 0;"> <span id="LC2138" 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;">return</span> <span class="n" style="color: #333;">non_matched</span></span>
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2144
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2139
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<pre style="margin: 0;"> <span id="LC2139" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2145
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<pre style="margin: 0;">-<span id="LC2145" class="line" lang="haskell"> <span class="n" style="color: #333;">us</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;">tm_state</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveOneEq</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">mkNegEq</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2140" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Refutable shapes] in TmOracle</span></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;">us</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;">tm_state</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addSolveRefutableAltCon</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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2146
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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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNLit</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="n" style="color: #333;">l</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">lits</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">vva</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span> <span class="p">{</span> <span class="n" style="color: #333;">delta_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tm_state</span> <span class="p">})]</span></span>
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2143
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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;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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2144
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<pre style="margin: 0;"> <span id="LC2144" 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">@@ -2407,22 +2403,22 @@ these constraints.</td>
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<pre style="margin: 0;"> <span id="LC2403" class="line" lang="haskell"><span class="n" style="color: #333;">genCaseTmCs2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Scrutinee</span></span>
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2408
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<pre style="margin: 0;"> <span id="LC2404" 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;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- LHS (should have length 1)</span></span>
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2409
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<pre style="margin: 0;"> <span id="LC2405" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- MatchVars (should have length 1)</span></span>
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<pre style="margin: 0;">-<span id="LC2410" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">SimpleEq</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2406" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TmVarCt</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2407" class="line" lang="haskell"><span class="n" style="color: #333;">genCaseTmCs2</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</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="n" style="color: #333;">emptyBag</span></span>
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<pre style="margin: 0;"> <span id="LC2408" class="line" lang="haskell"><span class="n" style="color: #333;">genCaseTmCs2</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">scr</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">p</span><span class="p">]</span> <span class="p">[</span><span class="n" style="color: #333;">var</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC2409" class="line" lang="haskell"> <span class="n" style="color: #333;">fam_insts</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGetFamInstEnvs</span></span>
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<pre style="margin: 0;"> <span id="LC2410" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">e</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">vaToPmExpr</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">coercePatVec</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">translatePat</span> <span class="n" style="color: #333;">fam_insts</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;"> <span id="LC2411" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">scr_e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhsExprToPmExpr</span> <span class="n" style="color: #333;">scr</span></span>
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<pre style="margin: 0;">-<span id="LC2416" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">listToBag</span> <span class="p">[(</span><span class="n" style="color: #333;"><span class="idiff left">var</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">e</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">var</span></span><span class="p"><span class="idiff right">,</span></span> <span class="n" style="color: #333;">scr_e</span><span class="p">)]</span></span>
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<pre style="margin: 0;">+<span id="LC2412" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">listToBag</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TVC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">var</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">e</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TVC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">var</span></span> <span class="n" style="color: #333;">scr_e</span><span class="p">)]</span></span>
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<pre style="margin: 0;"> <span id="LC2413" class="line" lang="haskell"><span class="n" style="color: #333;">genCaseTmCs2</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"genCaseTmCs2: HsCase"</span></span>
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2418
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2414
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<pre style="margin: 0;"> <span id="LC2414" class="line" lang="haskell"></span>
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2419
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<pre style="margin: 0;"> <span id="LC2415" class="line" lang="haskell"><span class="cd">-- | Generate a simple equality when checking a case expression:</span></span>
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2420
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2416
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<pre style="margin: 0;"> <span id="LC2416" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- case x of { matches }</span></span>
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2421
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2417
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<pre style="margin: 0;"> <span id="LC2417" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When checking matches we record that (x ~ y) where y is the initial</span></span>
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2422
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2418
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<pre style="margin: 0;"> <span id="LC2418" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- uncovered. All matches will have to satisfy this equality.</span></span>
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2423
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<pre style="margin: 0;">-<span id="LC2423" class="line" lang="haskell"><span class="n" style="color: #333;">genCaseTmCs1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</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="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">SimpleEq</span></span></span>
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<pre style="margin: 0;">+<span id="LC2419" class="line" lang="haskell"><span class="n" style="color: #333;">genCaseTmCs1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</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="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TmVarCt</span></span></span>
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2424
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2420
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<pre style="margin: 0;"> <span id="LC2420" class="line" lang="haskell"><span class="n" style="color: #333;">genCaseTmCs1</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span></span>
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2425
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<pre style="margin: 0;">-<span id="LC2425" class="line" lang="haskell"><span class="n" style="color: #333;">genCaseTmCs1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">scr</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">var</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitBag</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">var</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lhsExprToPmExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">scr</span></span><span class="p">)</span></span>
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2421
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<pre style="margin: 0;">+<span id="LC2421" class="line" lang="haskell"><span class="n" style="color: #333;">genCaseTmCs1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">scr</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">var</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitBag</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TVC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">var</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">lhsExprToPmExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">scr</span></span><span class="p"><span class="idiff right">)</span>)</span></span>
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2426
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2422
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<pre style="margin: 0;"> <span id="LC2422" class="line" lang="haskell"><span class="n" style="color: #333;">genCaseTmCs1</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"genCaseTmCs1: HsCase"</span></span>
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2427
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2423
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<pre style="margin: 0;"> <span id="LC2423" class="line" lang="haskell"></span>
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2424
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<pre style="margin: 0;"> <span id="LC2424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Literals in PmPat]</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">@@ -2484,21 +2480,15 @@ isAnyPmCheckEnabled dflags (DsMatchContext kind _loc)</td>
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<pre style="margin: 0;"> <span id="LC2480" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2481" 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;">ValVec</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC2482" 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;">ValVec</span> <span class="n" style="color: #333;">vva</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2487" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">residual_eqs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">subst</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wrapUpTmState</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2488" class="line" lang="haskell"> <span class="n" style="color: #333;">vector</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substInValAbs</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">vva</span></span>
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<pre style="margin: 0;">-<span id="LC2489" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">ppr<span class="idiff left">_uncovered</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">vector</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">residual_eq</span>s</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2483" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">subst</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">refuts</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wrapUpTmState</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2484" class="line" lang="haskell"> <span class="n" style="color: #333;">vector</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substInValAbs</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">vva</span></span>
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<pre style="margin: 0;">+<span id="LC2485" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">ppr<span class="idiff left">Uncovered</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">vector</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">refut</span>s</span><span class="p">)</span></span>
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2486
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<pre style="margin: 0;"> <span id="LC2486" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2487" class="line" lang="haskell"><span class="cd">-- | Apply a term substitution to a value vector abstraction. All VAs are</span></span>
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<pre style="margin: 0;"> <span id="LC2488" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- transformed to PmExpr (used only before pretty printing).</span></span>
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<pre style="margin: 0;">-<span id="LC2493" class="line" lang="haskell"><span class="n" style="color: #333;">substInValAbs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">PmVar</span>Env</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ValAbs</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;">PmExpr</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC2489" class="line" lang="haskell"><span class="n" style="color: #333;">substInValAbs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TmVarCt</span>Env</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ValAbs</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;">PmExpr</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC2490" class="line" lang="haskell"><span class="n" style="color: #333;">substInValAbs</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">vaToPmExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2491" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2496" class="line" lang="haskell"><span class="cd">-- | Wrap up the term oracle's state once solving is complete. Drop any</span></span>
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<pre style="margin: 0;">-<span id="LC2497" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- information about unhandled constraints (involving HsExprs) and flatten</span></span>
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<pre style="margin: 0;">-<span id="LC2498" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (height 1) the substitution.</span></span>
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<pre style="margin: 0;">-<span id="LC2499" class="line" lang="haskell"><span class="n" style="color: #333;">wrapUpTmState</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2500" class="line" lang="haskell"><span class="n" style="color: #333;">wrapUpTmState</span> <span class="p">(</span><span class="n" style="color: #333;">residual</span><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;">subst</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">residual</span><span class="p">,</span> <span class="n" style="color: #333;">flattenPmVarEnv</span> <span class="n" style="color: #333;">subst</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2501" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2492" class="line" lang="haskell"><span class="cd">-- | Issue all the warnings (coverage, exhaustiveness, inaccessibility)</span></span>
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<pre style="margin: 0;"> <span id="LC2493" class="line" lang="haskell"><span class="n" style="color: #333;">dsPmWarn</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;">DsMatchContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmResult</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC2494" class="line" lang="haskell"><span class="n" style="color: #333;">dsPmWarn</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ctx</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="n" style="color: #333;">pm_result</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">@@ -2538,10 +2528,11 @@ dsPmWarn dflags ctx@(DsMatchContext kind loc) pm_result</td>
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<pre style="margin: 0;"> <span id="LC2528" class="line" lang="haskell"> <span class="n" style="color: #333;">maxPatterns</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maxUncoveredPatterns</span> <span class="n" style="color: #333;">dflags</span></span>
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2539
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2529
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<pre style="margin: 0;"> <span id="LC2529" class="line" lang="haskell"></span>
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2540
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2530
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<pre style="margin: 0;"> <span id="LC2530" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Print a single clause (for redundant/with-inaccessible-rhs)</span></span>
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2541
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<pre style="margin: 0;">-<span id="LC2541" class="line" lang="haskell"> <span class="n" style="color: #333;">pprEqn</span> <span class="n" style="color: #333;">q</span> <span class="n" style="color: #333;">txt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pp_context</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">txt</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ppr_eqn</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">q</span></span>
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<pre style="margin: 0;">+<span id="LC2531" class="line" lang="haskell"> <span class="n" style="color: #333;">pprEqn</span> <span class="n" style="color: #333;">q</span> <span class="n" style="color: #333;">txt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprContext</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">txt</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC2532" class="line" lang="haskell"> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">pprPats</span> <span class="n" style="color: #333;">kind</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">q</span><span class="p">))</span></span>
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2533
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<pre style="margin: 0;"> <span id="LC2533" class="line" lang="haskell"></span>
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2543
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2534
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<pre style="margin: 0;"> <span id="LC2534" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Print several clauses (for uncovered clauses)</span></span>
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2544
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<pre style="margin: 0;">-<span id="LC2544" class="line" lang="haskell"> <span class="n" style="color: #333;">pprEqns</span> <span class="n" style="color: #333;">qs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pp<span class="idiff left right">_c</span>ontext</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"are non-exhaustive"</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC2535" class="line" lang="haskell"> <span class="n" style="color: #333;">pprEqns</span> <span class="n" style="color: #333;">qs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pp<span class="idiff left right">rC</span>ontext</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"are non-exhaustive"</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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2545
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2536
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<pre style="margin: 0;"> <span id="LC2536" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">qs</span> <span class="kr" style="font-weight: 600;">of</span> <span class="c1" style="color: #998; font-style: italic;">-- See #11245</span></span>
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2546
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2537
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<pre style="margin: 0;"> <span id="LC2537" class="line" lang="haskell"> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">]</span></span>
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2547
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<pre style="margin: 0;"> <span id="LC2538" 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;">"Guards do not cover entire pattern space"</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">@@ -2552,7 +2543,7 @@ dsPmWarn dflags ctx@(DsMatchContext kind loc) pm_result</td>
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<pre style="margin: 0;"> <span id="LC2543" class="line" lang="haskell"></span>
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2553
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<pre style="margin: 0;"> <span id="LC2544" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Print a type-annotated wildcard (for non-exhaustive `EmptyCase`s for</span></span>
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2554
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2545
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<pre style="margin: 0;"> <span id="LC2545" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- which we only know the type and have no inhabitants at hand)</span></span>
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2555
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<pre style="margin: 0;">-<span id="LC2555" class="line" lang="haskell"> <span class="n" style="color: #333;">warnEmptyCase</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pp<span class="idiff left right">_c</span>ontext</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"are non-exhaustive"</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC2546" class="line" lang="haskell"> <span class="n" style="color: #333;">warnEmptyCase</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pp<span class="idiff left right">rC</span>ontext</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"are non-exhaustive"</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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2556
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<td class="diff-line-num new_line" data-linenumber="2547" 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">
2547
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<pre style="margin: 0;"> <span id="LC2547" 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;">"Patterns not matched:"</span><span class="p">)</span> <span class="mi" style="color: #099;">4</span> <span class="p">(</span><span class="n" style="color: #333;">underscore</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 class="p">)</span></span>
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2557
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2548
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<pre style="margin: 0;"> <span id="LC2548" class="line" lang="haskell"></span>
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2558
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2549
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<pre style="margin: 0;"> <span id="LC2549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Inaccessible warnings for record updates]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2624" 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="2615" 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">@@ -2624,8 +2615,8 @@ exhaustiveWarningFlag (StmtCtxt {}) = Nothing -- Don't warn about incomplete pat</td>
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2624
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2615
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<pre style="margin: 0;"> <span id="LC2615" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- incomplete</span></span>
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<td class="diff-line-num old_line" data-linenumber="2625" 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">
2625
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2616
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<pre style="margin: 0;"> <span id="LC2616" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="2626" 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">
2626
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<td class="diff-line-num new_line" data-linenumber="2617" 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">
2617
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<pre style="margin: 0;"> <span id="LC2617" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True <==> singular</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2627" 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">
2627
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<td class="diff-line-num new_line old" data-linenumber="2618" 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="LC2627" class="line" lang="haskell"><span class="n" style="color: #333;">pp<span class="idiff left right">_c</span>ontext</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</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="p">((</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;">SDoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2628" 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">
2628
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<pre style="margin: 0;">-<span id="LC2628" class="line" lang="haskell"><span class="n" style="color: #333;">pp<span class="idiff left right">_c</span>ontext</span> <span class="n" style="color: #333;">singular</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">_loc</span><span class="p">)</span> <span class="n" style="color: #333;">msg</span> <span class="n" style="color: #333;">rest_of_msg_fun</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2629" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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2618
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<pre style="margin: 0;">+<span id="LC2618" class="line" lang="haskell"><span class="n" style="color: #333;">pp<span class="idiff left right">rC</span>ontext</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</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="p">((</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;">SDoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2619" 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">
2619
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<pre style="margin: 0;">+<span id="LC2619" class="line" lang="haskell"><span class="n" style="color: #333;">pp<span class="idiff left right">rC</span>ontext</span> <span class="n" style="color: #333;">singular</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">_loc</span><span class="p">)</span> <span class="n" style="color: #333;">msg</span> <span class="n" style="color: #333;">rest_of_msg_fun</span></span>
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2629
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<td class="diff-line-num new_line" data-linenumber="2620" 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">
2620
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<pre style="margin: 0;"> <span id="LC2620" class="line" lang="haskell"> <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;">text</span> <span class="n" style="color: #333;">txt</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">msg</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="2630" 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">
2630
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<td class="diff-line-num new_line" data-linenumber="2621" 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">
2621
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<pre style="margin: 0;"> <span id="LC2621" class="line" lang="haskell"> <span class="n" style="color: #333;">sep</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"In"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr_match</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">':'</span></span>
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<td class="diff-line-num old_line" data-linenumber="2631" 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">
2631
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2622
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<pre style="margin: 0;"> <span id="LC2622" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nest</span> <span class="mi" style="color: #099;">4</span> <span class="p">(</span><span class="n" style="color: #333;">rest_of_msg_fun</span> <span class="n" style="color: #333;">pref</span><span class="p">)]]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2639" 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="2630" 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">@@ -2639,87 +2630,10 @@ pp_context singular (DsMatchContext kind _loc) msg rest_of_msg_fun</td>
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2639
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2630
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<pre style="margin: 0;"> <span id="LC2630" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">pprMatchContext</span> <span class="n" style="color: #333;">kind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">pp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fun</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp</span><span class="p">)</span></span>
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2640
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2631
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<pre style="margin: 0;"> <span id="LC2631" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">pprMatchContext</span> <span class="n" style="color: #333;">kind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">pp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pp</span><span class="p">)</span></span>
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2641
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2632
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<pre style="margin: 0;"> <span id="LC2632" class="line" lang="haskell"></span>
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2642
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<pre style="margin: 0;">-<span id="LC2642" class="line" lang="haskell"><span class="n" style="color: #333;">ppr<span class="idiff left right">_p</span>ats</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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2643
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<pre style="margin: 0;">-<span id="LC2643" class="line" lang="haskell"><span class="n" style="color: #333;">ppr<span class="idiff left right">_p</span>ats</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">pats</span></span>
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2633
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<pre style="margin: 0;">+<span id="LC2633" class="line" lang="haskell"><span class="n" style="color: #333;">ppr<span class="idiff left right">P</span>ats</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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2634
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<pre style="margin: 0;">+<span id="LC2634" class="line" lang="haskell"><span class="n" style="color: #333;">ppr<span class="idiff left right">P</span>ats</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">pats</span></span>
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2644
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<td class="diff-line-num new_line" data-linenumber="2635" 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">
2635
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<pre style="margin: 0;"> <span id="LC2635" class="line" lang="haskell"> <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;">sep</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;">pats</span><span class="p">),</span> <span class="n" style="color: #333;">matchSeparator</span> <span class="n" style="color: #333;">kind</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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2645
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2636
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<pre style="margin: 0;"> <span id="LC2636" class="line" lang="haskell"></span>
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2646
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<td class="diff-line-num new_line old" data-linenumber="2637" 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="LC2646" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_eqn</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="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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2647
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<pre style="margin: 0;">-<span id="LC2647" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_eqn</span> <span class="n" style="color: #333;">prefixF</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">eqn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">prefixF</span> <span class="p">(</span><span class="n" style="color: #333;">ppr_pats</span> <span class="n" style="color: #333;">kind</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">eqn</span><span class="p">))</span></span>
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2648
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<pre style="margin: 0;">-<span id="LC2648" class="line" lang="haskell"></span>
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2649
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<pre style="margin: 0;">-<span id="LC2649" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_constraint</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 class="kt" style="color: #458; font-weight: 600;">PmLit</span><span class="p">])</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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2650
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<pre style="margin: 0;">-<span id="LC2650" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_constraint</span> <span class="p">(</span><span class="n" style="color: #333;">var</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"is not one of"</span></span>
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2651
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<pre style="margin: 0;">-<span id="LC2651" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">pprWithCommas</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lits</span><span class="p">)</span></span>
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2652
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<pre style="margin: 0;">-<span id="LC2652" class="line" lang="haskell"></span>
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2653
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<pre style="margin: 0;">-<span id="LC2653" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_uncovered</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span><span class="p">])</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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2654
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<pre style="margin: 0;">-<span id="LC2654" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_uncovered</span> <span class="p">(</span><span class="n" style="color: #333;">expr_vec</span><span class="p">,</span> <span class="n" style="color: #333;">complex</span><span class="p">)</span></span>
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2655
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<pre style="margin: 0;">-<span id="LC2655" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fsep</span> <span class="n" style="color: #333;">vec</span> <span class="c1" style="color: #998; font-style: italic;">-- there are no literal constraints</span></span>
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2656
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<pre style="margin: 0;">-<span id="LC2656" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">fsep</span> <span class="n" style="color: #333;">vec</span><span class="p">)</span> <span class="mi" style="color: #099;">4</span> <span class="o" style="font-weight: 600;">$</span></span>
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2657
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<td class="diff-line-num new_line old" data-linenumber="2637" 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="LC2657" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"where"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">vcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr_constraint</span> <span class="n" style="color: #333;">cs</span><span class="p">)</span></span>
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2658
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<pre style="margin: 0;">-<span id="LC2658" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2659
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<pre style="margin: 0;">-<span id="LC2659" class="line" lang="haskell"> <span class="n" style="color: #333;">sdoc_vec</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">expr_vec</span></span>
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2660
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<pre style="margin: 0;">-<span id="LC2660" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">vec</span><span class="p">,</span><span class="n" style="color: #333;">cs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runPmPprM</span> <span class="n" style="color: #333;">sdoc_vec</span> <span class="p">(</span><span class="n" style="color: #333;">filterComplex</span> <span class="n" style="color: #333;">complex</span><span class="p">)</span></span>
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2661
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<pre style="margin: 0;">-<span id="LC2661" class="line" lang="haskell"></span>
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2662
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<pre style="margin: 0;">-<span id="LC2662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Representation of Term Equalities]</span></span>
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2663
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<pre style="margin: 0;">-<span id="LC2663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2664
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<pre style="margin: 0;">-<span id="LC2664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the paper, term constraints always take the form (x ~ e). Of course, a more</span></span>
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2665
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<pre style="margin: 0;">-<span id="LC2665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">general constraint of the form (e1 ~ e1) can always be transformed to an</span></span>
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2666
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<pre style="margin: 0;">-<span id="LC2666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equivalent set of the former constraints, by introducing a fresh, intermediate</span></span>
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2667
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<pre style="margin: 0;">-<span id="LC2667" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variable: { y ~ e1, y ~ e1 }. Yet, implementing this representation gave rise</span></span>
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2668
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<pre style="margin: 0;">-<span id="LC2668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to #11160 (incredibly bad performance for literal pattern matching). Two are</span></span>
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2669
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<pre style="margin: 0;">-<span id="LC2669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the main sources of this problem (the actual problem is how these two interact</span></span>
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2670
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<pre style="margin: 0;">-<span id="LC2670" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with each other):</span></span>
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2671
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<pre style="margin: 0;">-<span id="LC2671" class="line" lang="haskell"></span>
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2672
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<pre style="margin: 0;">-<span id="LC2672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Pattern matching on literals generates twice as many constraints as needed.</span></span>
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2673
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<pre style="margin: 0;">-<span id="LC2673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Consider the following (tests/ghci/should_run/ghcirun004):</span></span>
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2674
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<pre style="margin: 0;">-<span id="LC2674" class="line" lang="haskell"></span>
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2675
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<pre style="margin: 0;">-<span id="LC2675" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo :: Int -> Int</span></span>
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2676
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<pre style="margin: 0;">-<span id="LC2676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo 1 = 0</span></span>
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2677
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<pre style="margin: 0;">-<span id="LC2677" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...</span></span>
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2678
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<pre style="margin: 0;">-<span id="LC2678" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo 5000 = 4999</span></span>
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2679
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<pre style="margin: 0;">-<span id="LC2679" class="line" lang="haskell"></span>
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2680
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<pre style="margin: 0;">-<span id="LC2680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The covered and uncovered set *should* look like:</span></span>
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2681
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<pre style="margin: 0;">-<span id="LC2681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> U0 = { x |> {} }</span></span>
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2682
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<pre style="margin: 0;">-<span id="LC2682" class="line" lang="haskell"></span>
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2683
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<pre style="margin: 0;">-<span id="LC2683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> C1 = { 1 |> { x ~ 1 } }</span></span>
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2684
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<pre style="margin: 0;">-<span id="LC2684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> U1 = { x |> { False ~ (x ~ 1) } }</span></span>
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2685
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<pre style="margin: 0;">-<span id="LC2685" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...</span></span>
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2686
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<pre style="margin: 0;">-<span id="LC2686" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> C10 = { 10 |> { False ~ (x ~ 1), .., False ~ (x ~ 9), x ~ 10 } }</span></span>
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2687
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<pre style="margin: 0;">-<span id="LC2687" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> U10 = { x |> { False ~ (x ~ 1), .., False ~ (x ~ 9), False ~ (x ~ 10) } }</span></span>
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2688
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<pre style="margin: 0;">-<span id="LC2688" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...</span></span>
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2689
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<pre style="margin: 0;">-<span id="LC2689" class="line" lang="haskell"></span>
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2690
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<pre style="margin: 0;">-<span id="LC2690" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we replace { False ~ (x ~ 1) } with { y ~ False, y ~ (x ~ 1) }</span></span>
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2691
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<pre style="margin: 0;">-<span id="LC2691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we get twice as many constraints. Also note that half of them are just the</span></span>
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2692
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<pre style="margin: 0;">-<span id="LC2692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> substitution [x |-> False].</span></span>
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2693
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<pre style="margin: 0;">-<span id="LC2693" class="line" lang="haskell"></span>
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2694
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<pre style="margin: 0;">-<span id="LC2694" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. The term oracle (`tmOracle` in deSugar/TmOracle) uses equalities of the form</span></span>
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2695
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<pre style="margin: 0;">-<span id="LC2695" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (x ~ e) as substitutions [x |-> e]. More specifically, function</span></span>
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2696
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<pre style="margin: 0;">-<span id="LC2696" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `extendSubstAndSolve` applies such substitutions in the residual constraints</span></span>
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2697
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<pre style="margin: 0;">-<span id="LC2697" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and partitions them in the affected and non-affected ones, which are the new</span></span>
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2698
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<pre style="margin: 0;">-<span id="LC2698" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> worklist. Essentially, this gives quadradic behaviour on the number of the</span></span>
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2699
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<pre style="margin: 0;">-<span id="LC2699" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> residual constraints. (This would not be the case if the term oracle used</span></span>
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2700
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<pre style="margin: 0;">-<span id="LC2700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mutable variables but, since we use it to handle disjunctions on value set</span></span>
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2701
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<pre style="margin: 0;">-<span id="LC2701" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> abstractions (`Union` case), we chose a pure, incremental interface).</span></span>
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2702
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<pre style="margin: 0;">-<span id="LC2702" class="line" lang="haskell"></span>
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2703
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<pre style="margin: 0;">-<span id="LC2703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now the problem becomes apparent (e.g. for clause 300):</span></span>
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2704
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<pre style="margin: 0;">-<span id="LC2704" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Set U300 contains 300 substituting constraints [y_i |-> False] and 300</span></span>
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2705
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<pre style="margin: 0;">-<span id="LC2705" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constraints that we know that will not reduce (stay in the worklist).</span></span>
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2706
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<pre style="margin: 0;">-<span id="LC2706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * To check for consistency, we apply the substituting constraints ONE BY ONE</span></span>
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<pre style="margin: 0;">-<span id="LC2707" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (since `tmOracle` is called incrementally, it does not have all of them</span></span>
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2708
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<pre style="margin: 0;">-<span id="LC2708" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> available at once). Hence, we go through the (non-progressing) constraints</span></span>
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<pre style="margin: 0;">-<span id="LC2709" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> over and over, achieving over-quadradic behaviour.</span></span>
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2710
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<pre style="margin: 0;">-<span id="LC2710" class="line" lang="haskell"></span>
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2711
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<pre style="margin: 0;">-<span id="LC2711" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If instead we allow constraints of the form (e ~ e),</span></span>
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2712
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<pre style="margin: 0;">-<span id="LC2712" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * All uncovered sets Ui contain no substituting constraints and i</span></span>
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2713
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<pre style="margin: 0;">-<span id="LC2713" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> non-progressing constraints of the form (False ~ (x ~ lit)) so the oracle</span></span>
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2714
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<pre style="margin: 0;">-<span id="LC2714" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> behaves linearly.</span></span>
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2715
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<pre style="margin: 0;">-<span id="LC2715" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * All covered sets Ci contain exactly (i-1) non-progressing constraints and</span></span>
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2716
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<pre style="margin: 0;">-<span id="LC2716" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a single substituting constraint. So the term oracle goes through the</span></span>
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2717
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<pre style="margin: 0;">-<span id="LC2717" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constraints only once.</span></span>
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2718
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<pre style="margin: 0;">-<span id="LC2718" class="line" lang="haskell"></span>
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2719
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<pre style="margin: 0;">-<span id="LC2719" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The performance improvement becomes even more important when more arguments are</span></span>
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2720
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<pre style="margin: 0;">-<span id="LC2720" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">involved.</span></span>
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<pre style="margin: 0;">-<span id="LC2721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2722
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<pre style="margin: 0;">-<span id="LC2722" class="line" lang="haskell"></span>
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2637
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<pre style="margin: 0;"> <span id="LC2637" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Debugging Infrastructre</span></span>
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2724
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2638
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<pre style="margin: 0;"> <span id="LC2638" class="line" lang="haskell"></span>
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2725
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2639
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<pre style="margin: 0;"> <span id="LC2639" class="line" lang="haskell"><span class="n" style="color: #333;">tracePm</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;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2757" 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="2671" 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">@@ -2757,3 +2671,5 @@ pprValAbs ps = hang (text "ValAbs:") 2</td>
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2757
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<pre style="margin: 0;"> <span id="LC2671" class="line" lang="haskell"><span class="n" style="color: #333;">pprValVecDebug</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ValVec</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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2672
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<pre style="margin: 0;"> <span id="LC2672" class="line" lang="haskell"><span class="n" style="color: #333;">pprValVecDebug</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="n" style="color: #333;">vas</span> <span class="n" style="color: #333;">_d</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;">"ValVec"</span> <span class="o" style="font-weight: 600;"><+></span></span>
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2759
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2673
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<pre style="margin: 0;"> <span id="LC2673" class="line" lang="haskell"> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">pprValAbs</span> <span class="n" style="color: #333;">vas</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2674" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <not a haddock> $$ ppr (delta_tm_cs _d)</span></span>
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<pre style="margin: 0;">+<span id="LC2675" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <not a haddock> $$ ppr (delta_ty_cs _d)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/b8dd271855dde17a19553412e9e817195c2b5362#cdd7bc06da6b3eab3e2072ece6294a7f54808f28"><strong>compiler/deSugar/DsMonad.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">@@ -396,11 +396,11 @@ addDictsDs ev_vars</td>
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<pre style="margin: 0;"> <span id="LC396" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updLclEnv</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">env</span> <span class="p">{</span> <span class="n" style="color: #333;">dsl_dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unionBags</span> <span class="n" style="color: #333;">ev_vars</span> <span class="p">(</span><span class="n" style="color: #333;">dsl_dicts</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC397" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC398" class="line" lang="haskell"><span class="cd">-- | Get in-scope term constraints (pm check)</span></span>
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<pre style="margin: 0;">-<span id="LC399" class="line" lang="haskell"><span class="n" style="color: #333;">getTmCsDs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">SimpleEq</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC399" class="line" lang="haskell"><span class="n" style="color: #333;">getTmCsDs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TmVarCt</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC400" class="line" lang="haskell"><span class="n" style="color: #333;">getTmCsDs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLclEnv</span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">dsl_tm_cs</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC401" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="haskell"><span class="cd">-- | Add in-scope term constraints (pm check)</span></span>
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<pre style="margin: 0;">-<span id="LC403" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCsDs</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;"><span class="idiff left right">SimpleEq</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC403" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCsDs</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;"><span class="idiff left right">TmVarCt</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC404" class="line" lang="haskell"><span class="n" style="color: #333;">addTmCsDs</span> <span class="n" style="color: #333;">tm_cs</span></span>
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<pre style="margin: 0;"> <span id="LC405" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updLclEnv</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">env</span> <span class="p">{</span> <span class="n" style="color: #333;">dsl_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unionBags</span> <span class="n" style="color: #333;">tm_cs</span> <span class="p">(</span><span class="n" style="color: #333;">dsl_tm_cs</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC406" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/b8dd271855dde17a19553412e9e817195c2b5362#7589abbc710cc40f6e48245c2bc16d69f556b714"><strong>compiler/deSugar/PmExpr.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -6,12 +6,11 @@ Haskell expressions (as used by the pattern matching checker) and utilities.</td>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP #-}</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ViewPatterns #-}</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GeneralizedNewtypeDeriving #-}</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">PmExpr</span> <span class="p">(</span></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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;">PmLit</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">SimpleEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">toComplex</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">eqPmLit</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">truePmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">falsePmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTruePmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isFalsePmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isNotPmExprOther</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">lhsExprToPmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsExprToPmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">substComplexEq</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">filterComplex</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprPmExprWithParens</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">runPmPprM</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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;">PmLit</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</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;">TmVarCt</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="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">eqPmLit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isNotPmExprOther</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lhsExprToPmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsExprToPmExpr</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -23,19 +22,14 @@ import FastString (FastString, unpackFS)</td>
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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;">HsSyn</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Id</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Name</span></span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">NameSet</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DataCon</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ConLike</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TcEvidence</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">isErasableHsWrapper</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TcType</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">isStringTy</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TysWiredIn</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Outputable</span></span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Util</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">SrcLoc</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="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">mapMaybe</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;">Data.List</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">groupBy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">sortBy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nubBy</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;">Control.Monad.Trans.State.Lazy</span></span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC33" 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="LC34" 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="LC35" 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">@@ -61,7 +55,6 @@ refer to variables that are otherwise substituted away.</td>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span></span>
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<pre style="margin: 0;">-<span id="LC64" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="c1" style="color: #998; font-style: italic;">-- Syntactic equality</span></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [PmExprOther in PmExpr]</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"></span>
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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">@@ -79,6 +72,16 @@ eqPmLit (PmOLit b1 l1) (PmOLit b2 l2) = b1 == b2 && l1 == l2</td>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Undecidable Equality for Overloaded Literals]</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"><span class="n" style="color: #333;">eqPmLit</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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<pre style="margin: 0;"> <span id="LC74" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"><span class="cd">-- | Represents a match against a literal. We mostly use it to to encode shapes</span></span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for a variable that immediately lead to a refutation.</span></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Refutable shapes] in TmOracle. Really similar to 'CoreSyn.AltCon'.</span></span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span></span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span></span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">l1</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">l2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqPmLit</span> <span class="n" style="color: #333;">l1</span> <span class="n" style="color: #333;">l2</span></span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Undecidable Equality for Overloaded Literals]</span></span>
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Equality on overloaded literals is undecidable in the general case. Consider</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -145,24 +148,11 @@ impact of this is the following:</td>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> appearance of the warnings and is, in practice safe.</span></span>
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<pre style="margin: 0;"> <span id="LC149" 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="LC150" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">nubPmLit</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">PmLit</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmLit</span></span><span class="p"><span class="idiff right">]</span></span></span>
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<pre style="margin: 0;">-<span id="LC149" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">nubPmLit</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">nubBy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">eqPmLit</span></span></span>
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"><span class="cd"><span class="idiff left right">-- | A term constraint. @TVC x e@ encodes that @x@ is equal to @e@.</span></span></span>
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"><span class="kr" style="font-weight: 600;"><span class="idiff left">data</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmVarCt</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">TVC</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">!</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">!</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">PmExpr</span></span></span>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC151" class="line" lang="haskell"><span class="cd">-- | Term equalities</span></span>
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<pre style="margin: 0;">-<span id="LC152" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">SimpleEq</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- We always use this orientation</span></span>
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<pre style="margin: 0;">-<span id="LC153" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">)</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="LC155" class="line" lang="haskell"><span class="cd">-- | Lift a `SimpleEq` to a `ComplexEq`</span></span>
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<pre style="margin: 0;">-<span id="LC156" class="line" lang="haskell"><span class="n" style="color: #333;">toComplex</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SimpleEq</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span></span>
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<pre style="margin: 0;">-<span id="LC157" class="line" lang="haskell"><span class="n" style="color: #333;">toComplex</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">e</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;">PmExprVar</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">x</span><span class="p">),</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="haskell"><span class="cd">-- | Expression `True'</span></span>
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<pre style="margin: 0;">-<span id="LC160" class="line" lang="haskell"><span class="n" style="color: #333;">truePmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span></span>
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<pre style="margin: 0;">-<span id="LC161" class="line" lang="haskell"><span class="n" style="color: #333;">truePmExpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPmExprData</span> <span class="n" style="color: #333;">trueDataCon</span> <span class="kt" style="color: #458; font-weight: 600;">[]</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="LC163" class="line" lang="haskell"><span class="cd">-- | Expression `False'</span></span>
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<pre style="margin: 0;">-<span id="LC164" class="line" lang="haskell"><span class="n" style="color: #333;">falsePmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span></span>
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<pre style="margin: 0;">-<span id="LC165" class="line" lang="haskell"><span class="n" style="color: #333;">falsePmExpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPmExprData</span> <span class="n" style="color: #333;">falseDataCon</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC154" 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;">TmVarCt</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC155" 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;">TVC</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</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;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'~'</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ----------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ** Predicates on PmExpr</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">@@ -172,66 +162,6 @@ isNotPmExprOther :: PmExpr -> Bool</td>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"><span class="n" style="color: #333;">isNotPmExprOther</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"><span class="n" style="color: #333;">isNotPmExprOther</span> <span class="n" style="color: #333;">_expr</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="LC164" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC175" class="line" lang="haskell"><span class="cd">-- | Check whether a literal is negated</span></span>
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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"><span class="n" style="color: #333;">isNegatedPmLit</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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177
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<pre style="margin: 0;">-<span id="LC177" class="line" lang="haskell"><span class="n" style="color: #333;">isNegatedPmLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmOLit</span> <span class="n" style="color: #333;">b</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;">b</span></span>
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178
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<pre style="margin: 0;">-<span id="LC178" class="line" lang="haskell"><span class="n" style="color: #333;">isNegatedPmLit</span> <span class="n" style="color: #333;">_other_lit</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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179
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<pre style="margin: 0;">-<span id="LC179" class="line" lang="haskell"></span>
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180
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="cd">-- | Check whether a PmExpr is syntactically equal to term `True'.</span></span>
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181
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<pre style="margin: 0;">-<span id="LC181" class="line" lang="haskell"><span class="n" style="color: #333;">isTruePmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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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182
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"><span class="n" style="color: #333;">isTruePmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">trueDataCon</span></span>
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183
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<pre style="margin: 0;">-<span id="LC183" class="line" lang="haskell"><span class="n" style="color: #333;">isTruePmExpr</span> <span class="n" style="color: #333;">_other_expr</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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184
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<pre style="margin: 0;">-<span id="LC184" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC185" class="line" lang="haskell"><span class="cd">-- | Check whether a PmExpr is syntactically equal to term `False'.</span></span>
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<pre style="margin: 0;">-<span id="LC186" class="line" lang="haskell"><span class="n" style="color: #333;">isFalsePmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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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187
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"><span class="n" style="color: #333;">isFalsePmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">falseDataCon</span></span>
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188
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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"><span class="n" style="color: #333;">isFalsePmExpr</span> <span class="n" style="color: #333;">_other_expr</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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189
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<pre style="margin: 0;">-<span id="LC189" class="line" lang="haskell"></span>
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190
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"><span class="cd">-- | Check whether a PmExpr is syntactically e</span></span>
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191
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<pre style="margin: 0;">-<span id="LC191" class="line" lang="haskell"><span class="n" style="color: #333;">isNilPmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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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192
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"><span class="n" style="color: #333;">isNilPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</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;">c</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">nilDataCon</span></span>
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193
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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"><span class="n" style="color: #333;">isNilPmExpr</span> <span class="n" style="color: #333;">_other_expr</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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194
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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"></span>
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195
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"><span class="cd">-- | Check whether a PmExpr is syntactically equal to (x == y).</span></span>
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196
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Since (==) is overloaded and can have an arbitrary implementation, we use</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 PmExprEq constructor to represent only equalities with non-overloaded</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;">-- literals where it coincides with a syntactic equality check.</span></span>
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"><span class="n" style="color: #333;">isPmExprEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">)</span></span>
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200
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"><span class="n" style="color: #333;">isPmExprEq</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span><span class="n" style="color: #333;">e2</span><span class="p">)</span></span>
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201
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<pre style="margin: 0;">-<span id="LC201" class="line" lang="haskell"><span class="n" style="color: #333;">isPmExprEq</span> <span class="n" style="color: #333;">_other_expr</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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202
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="haskell"></span>
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203
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<pre style="margin: 0;">-<span id="LC203" class="line" lang="haskell"><span class="cd">-- | Check if a DataCon is (:).</span></span>
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204
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"><span class="n" style="color: #333;">isConsDataCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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205
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"><span class="n" style="color: #333;">isConsDataCon</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">consDataCon</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">con</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="LC207" 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="LC208" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ** Substitution in PmExpr</span></span>
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209
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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="cd">-- | We return a boolean along with the expression. Hence, if substitution was</span></span>
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<pre style="margin: 0;">-<span id="LC211" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a no-op, we know that the expression still cannot progress.</span></span>
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<pre style="margin: 0;">-<span id="LC212" class="line" lang="haskell"><span class="n" style="color: #333;">substPmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span></span>
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213
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<pre style="margin: 0;">-<span id="LC213" class="line" lang="haskell"><span class="n" style="color: #333;">substPmExpr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span></span>
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214
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<pre style="margin: 0;">-<span id="LC214" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC215" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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216
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<pre style="margin: 0;">-<span id="LC216" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">e</span><span class="p">,</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="LC217" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">ps</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">ps'</span><span class="p">,</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAndUnzip</span> <span class="p">(</span><span class="n" style="color: #333;">substPmExpr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e1</span><span class="p">)</span> <span class="n" style="color: #333;">ps</span></span>
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<pre style="margin: 0;">-<span id="LC218" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">ps'</span><span class="p">,</span> <span class="n" style="color: #333;">or</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC219" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">ex</span> <span class="n" style="color: #333;">ey</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">ex'</span><span class="p">,</span> <span class="n" style="color: #333;">bx</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substPmExpr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">ex</span></span>
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<pre style="margin: 0;">-<span id="LC220" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ey'</span><span class="p">,</span> <span class="n" style="color: #333;">by</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substPmExpr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">ey</span></span>
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<pre style="margin: 0;">-<span id="LC221" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">ex'</span> <span class="n" style="color: #333;">ey'</span><span class="p">,</span> <span class="n" style="color: #333;">bx</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">by</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC222" class="line" lang="haskell"> <span class="n" style="color: #333;">_other_expr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">e</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- The rest are terminals (We silently ignore</span></span>
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<pre style="margin: 0;">-<span id="LC223" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Other). See Note [PmExprOther in PmExpr]</span></span>
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<pre style="margin: 0;">-<span id="LC224" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC225" class="line" lang="haskell"><span class="cd">-- | Substitute in a complex equality. We return (Left eq) if the substitution</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;">-- affected the equality or (Right eq) if nothing happened.</span></span>
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<pre style="margin: 0;">-<span id="LC227" class="line" lang="haskell"><span class="n" style="color: #333;">substComplexEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span></span>
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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell"><span class="n" style="color: #333;">substComplexEq</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="p">(</span><span class="n" style="color: #333;">ex</span><span class="p">,</span> <span class="n" style="color: #333;">ey</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC229" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">bx</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">by</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="p">(</span><span class="n" style="color: #333;">ex'</span><span class="p">,</span> <span class="n" style="color: #333;">ey'</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC230" 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;">Right</span> <span class="p">(</span><span class="n" style="color: #333;">ex'</span><span class="p">,</span> <span class="n" style="color: #333;">ey'</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC231" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC232" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ex'</span><span class="p">,</span> <span class="n" style="color: #333;">bx</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substPmExpr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">ex</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;">ey'</span><span class="p">,</span> <span class="n" style="color: #333;">by</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substPmExpr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">ey</span></span>
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<pre style="margin: 0;">-<span id="LC234" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC165" 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="LC166" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ** Lift source expressions (HsExpr Id) to PmExpr</span></span>
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<pre style="margin: 0;"> <span id="LC167" 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">@@ -240,8 +170,20 @@ lhsExprToPmExpr (dL->L _ e) = hsExprToPmExpr e</td>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"><span class="n" style="color: #333;">hsExprToPmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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="LC173" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Translating HsVar to flexible meta variables in the unification problem is</span></span>
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174
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- morally wrong, but it does the right thing for now.</span></span>
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In contrast to the situation in pattern matches, HsVars in expression syntax</span></span>
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176
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are object language variables, most similar to rigid variables with an</span></span>
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- unknown solution. The correct way would be to handle them through PmExprOther</span></span>
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and identify syntactically equal occurrences by the same rigid meta variable,</span></span>
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but we can't compare the wrapped HsExpr for equality. Hence we are stuck with</span></span>
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- this hack.</span></span>
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"><span class="n" style="color: #333;">hsExprToPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">x</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC244" class="line" lang="haskell"><span class="n" style="color: #333;">hsExprToPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsConLikeOut</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="p">(</span><span class="n" style="color: #333;">conLikeName</span> <span class="n" style="color: #333;">c</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Translating HsConLikeOut to a flexible meta variable is misleading.</span></span>
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For an example why, consider `consAreRigid` in</span></span>
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- `testsuite/tests/pmcheck/should_compile/PmExprVars.hs`.</span></span>
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- hsExprToPmExpr (HsConLikeOut _ c) = PmExprVar (conLikeName c)</span></span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Desugar literal strings as a list of characters. For other literal values,</span></span>
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- keep it as it is.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -294,7 +236,12 @@ hsExprToPmExpr (HsTickPragma _ _ _ _ e) = lhsExprToPmExpr e</td>
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<pre style="margin: 0;"> <span id="LC236" class="line" lang="haskell"><span class="n" style="color: #333;">hsExprToPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsSCC</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="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhsExprToPmExpr</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC237" class="line" lang="haskell"><span class="n" style="color: #333;">hsExprToPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsCoreAnn</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="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhsExprToPmExpr</span> <span class="n" style="color: #333;">e</span></span>
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296
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238
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<pre style="margin: 0;"> <span id="LC238" class="line" lang="haskell"><span class="n" style="color: #333;">hsExprToPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExprWithTySig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhsExprToPmExpr</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">-<span id="LC297" class="line" lang="haskell"><span class="n" style="color: #333;">hsExprToPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrap</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hsExprToPmExpr</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="haskell"><span class="n" style="color: #333;">hsExprToPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrap</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- A dictionary application spoils e and we have no choice but to return an</span></span>
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- PmExprOther. Same thing for other stuff that can't erased in the</span></span>
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- compilation process. Otherwise this bites in</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;">-- teststuite/tests/pmcheck/should_compile/PmExprVars.hs.</span></span>
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<pre style="margin: 0;">+<span id="LC244" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isErasableHsWrapper</span> <span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hsExprToPmExpr</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC245" class="line" lang="haskell"><span class="n" style="color: #333;">hsExprToPmExpr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="n" style="color: #333;">e</span> <span class="c1" style="color: #998; font-style: italic;">-- the rest are not handled by the oracle</span></span>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC247" class="line" lang="haskell"><span class="n" style="color: #333;">stringExprToList</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SourceText</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FastString</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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">@@ -312,155 +259,22 @@ stringExprToList src s = foldr cons nil (map charToPmExpr (unpackFS s))</td>
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<pre style="margin: 0;"> <span id="LC259" 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="LC260" 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="LC261" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- 1. Literals</span></span>
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<pre style="margin: 0;">-<span id="LC316" 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="LC317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Starting with a function definition like:</span></span>
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<pre style="margin: 0;">-<span id="LC318" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: Int -> Bool</span></span>
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<pre style="margin: 0;">-<span id="LC320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f 5 = True</span></span>
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<pre style="margin: 0;">-<span id="LC321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f 6 = True</span></span>
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<pre style="margin: 0;">-<span id="LC322" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The uncovered set looks like:</span></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;"> { var |> False == (var == 5), False == (var == 6) }</span></span>
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<pre style="margin: 0;">-<span id="LC325" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Yet, we would like to print this nicely as follows:</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;"> x , where x not one of {5,6}</span></span>
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<pre style="margin: 0;">-<span id="LC328" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Function `filterComplex' takes the set of residual constraints and packs</span></span>
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<pre style="margin: 0;">-<span id="LC330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">together the negative constraints that refer to the same variable so we can do</span></span>
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<pre style="margin: 0;">-<span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">just this. Since these variables will be shown to the programmer, we also give</span></span>
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<pre style="margin: 0;">-<span id="LC332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">them better names (t1, t2, ..), hence the SDoc in PmNegLitCt.</span></span>
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<pre style="margin: 0;">-<span id="LC333" class="line" lang="haskell"></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;">2. Residual Constraints</span></span>
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<pre style="margin: 0;">-<span id="LC335" 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="LC336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Unhandled constraints that refer to HsExpr are typically ignored by the solver</span></span>
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<pre style="margin: 0;">-<span id="LC337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(it does not even substitute in HsExpr so they are even printed as wildcards).</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;">Additionally, the oracle returns a substitution if it succeeds so we apply this</span></span>
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<pre style="margin: 0;">-<span id="LC339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substitution to the vectors before printing them out (see function `pprOne' in</span></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;">Check.hs) to be more precice.</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;">-}</span></span>
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<pre style="margin: 0;">-<span id="LC342" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC343" 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="LC344" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ** Transform residual constraints in appropriate form for pretty printing</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="LC346" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PmNegLitCt</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmLit</span><span class="p">]))</span></span>
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<pre style="margin: 0;">-<span id="LC347" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC348" class="line" lang="haskell"><span class="n" style="color: #333;">filterComplex</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ComplexEq</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;">PmNegLitCt</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC349" class="line" lang="haskell"><span class="n" style="color: #333;">filterComplex</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipWith</span> <span class="n" style="color: #333;">rename</span> <span class="n" style="color: #333;">nameList</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkGroup</span></span>
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<pre style="margin: 0;">-<span id="LC350" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">groupBy</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">sortBy</span> <span class="n" style="color: #333;">order</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">isNegLitCs</span></span>
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<pre style="margin: 0;">-<span id="LC351" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC352" class="line" lang="haskell"> <span class="n" style="color: #333;">order</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">compare</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="haskell"> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">-<span id="LC354" class="line" lang="haskell"> <span class="n" style="color: #333;">mkGroup</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="p">(</span><span class="n" style="color: #333;">head</span> <span class="n" style="color: #333;">l</span><span class="p">),</span> <span class="n" style="color: #333;">nubPmLit</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC355" class="line" lang="haskell"> <span class="n" style="color: #333;">rename</span> <span class="n" style="color: #333;">new</span> <span class="p">(</span><span class="n" style="color: #333;">old</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">old</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">new</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC356" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC357" class="line" lang="haskell"> <span class="n" style="color: #333;">isNegLitCs</span> <span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span><span class="n" style="color: #333;">e2</span><span class="p">)</span></span>
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358
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<pre style="margin: 0;">-<span id="LC358" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isFalsePmExpr</span> <span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isPmExprEq</span> <span class="n" style="color: #333;">e2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNegLitCs'</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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359
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<pre style="margin: 0;">-<span id="LC359" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isFalsePmExpr</span> <span class="n" style="color: #333;">e2</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isPmExprEq</span> <span class="n" style="color: #333;">e1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNegLitCs'</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">-<span id="LC360" 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;">Nothing</span></span>
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<pre style="margin: 0;">-<span id="LC361" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC362" class="line" lang="haskell"> <span class="n" style="color: #333;">isNegLitCs'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC363" class="line" lang="haskell"> <span class="n" style="color: #333;">isNegLitCs'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC364" class="line" lang="haskell"> <span class="n" style="color: #333;">isNegLitCs'</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="LC365" class="line" lang="haskell"></span>
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366
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<pre style="margin: 0;">-<span id="LC366" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Try nice names p,q,r,s,t before using the (ugly) t_i</span></span>
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<pre style="margin: 0;">-<span id="LC367" class="line" lang="haskell"> <span class="n" style="color: #333;">nameList</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">]</span></span>
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368
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<pre style="margin: 0;">-<span id="LC368" class="line" lang="haskell"> <span class="n" style="color: #333;">nameList</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">text</span> <span class="p">[</span><span class="s" style="color: #d14;">"p"</span><span class="p">,</span><span class="s" style="color: #d14;">"q"</span><span class="p">,</span><span class="s" style="color: #d14;">"r"</span><span class="p">,</span><span class="s" style="color: #d14;">"s"</span><span class="p">,</span><span class="s" style="color: #d14;">"t"</span><span class="p">]</span> <span class="o" style="font-weight: 600;">++</span></span>
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<pre style="margin: 0;">-<span id="LC369" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="p">(</span><span class="sc" style="color: #d14;">'t'</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">u</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">[(</span><span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span><span class="o" style="font-weight: 600;">..</span><span class="p">]</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC370" class="line" lang="haskell"></span>
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371
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<pre style="margin: 0;">-<span id="LC371" 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="LC372" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC373" class="line" lang="haskell"><span class="n" style="color: #333;">runPmPprM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmNegLitCt</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="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;">PmLit</span><span class="p">])])</span></span>
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"><span class="n" style="color: #333;">runPmPprM</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">lit_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">is_used</span> <span class="n" style="color: #333;">lit_env</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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;">result</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">_lit_env</span><span class="p">,</span> <span class="n" style="color: #333;">used</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runState</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">lit_env</span><span class="p">,</span> <span class="n" style="color: #333;">emptyNameSet</span><span class="p">)</span></span>
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377
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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="LC378" class="line" lang="haskell"> <span class="n" style="color: #333;">is_used</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">))</span></span>
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379
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<pre style="margin: 0;">-<span id="LC379" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">elemNameSet</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">used</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">)</span></span>
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380
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<pre style="margin: 0;">-<span id="LC380" 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;">Nothing</span></span>
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell"></span>
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382
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<pre style="margin: 0;">-<span id="LC382" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">State</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">PmNegLitCt</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">NameSet</span><span class="p">)</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC383" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (the first part of the state is read only. make it a reader?)</span></span>
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384
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<pre style="margin: 0;">-<span id="LC384" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC385" class="line" lang="haskell"><span class="n" style="color: #333;">addUsed</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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386
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<pre style="margin: 0;">-<span id="LC386" class="line" lang="haskell"><span class="n" style="color: #333;">addUsed</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">modify</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">negated</span><span class="p">,</span> <span class="n" style="color: #333;">used</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">negated</span><span class="p">,</span> <span class="n" style="color: #333;">extendNameSet</span> <span class="n" style="color: #333;">used</span> <span class="n" style="color: #333;">x</span><span class="p">))</span></span>
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387
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<pre style="margin: 0;">-<span id="LC387" class="line" lang="haskell"></span>
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388
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<pre style="margin: 0;">-<span id="LC388" class="line" lang="haskell"><span class="n" style="color: #333;">checkNegation</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- the clean name if it is negated</span></span>
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389
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<pre style="margin: 0;">-<span id="LC389" class="line" lang="haskell"><span class="n" style="color: #333;">checkNegation</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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390
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<pre style="margin: 0;">-<span id="LC390" class="line" lang="haskell"> <span class="n" style="color: #333;">negated</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">gets</span> <span class="n" style="color: #333;">fst</span></span>
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391
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<pre style="margin: 0;">-<span id="LC391" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookup</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">negated</span> <span class="kr" style="font-weight: 600;">of</span></span>
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392
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<pre style="margin: 0;">-<span id="LC392" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">new</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">new</span></span>
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393
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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394
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<pre style="margin: 0;">-<span id="LC394" class="line" lang="haskell"></span>
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395
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<pre style="margin: 0;">-<span id="LC395" class="line" lang="haskell"><span class="cd">-- | Pretty print a pmexpr, but remember to prettify the names of the variables</span></span>
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396
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<pre style="margin: 0;">-<span id="LC396" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that refer to neg-literals. The ones that cannot be shown are printed as</span></span>
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397
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<pre style="margin: 0;">-<span id="LC397" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- underscores.</span></span>
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398
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<pre style="margin: 0;">-<span id="LC398" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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399
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<pre style="margin: 0;">-<span id="LC399" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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400
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<pre style="margin: 0;">-<span id="LC400" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkNegation</span> <span class="n" style="color: #333;">x</span></span>
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401
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<pre style="margin: 0;">-<span id="LC401" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_name</span> <span class="kr" style="font-weight: 600;">of</span></span>
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402
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<pre style="margin: 0;">-<span id="LC402" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addUsed</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">name</span></span>
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403
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<pre style="margin: 0;">-<span id="LC403" 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;">return</span> <span class="n" style="color: #333;">underscore</span></span>
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<pre style="margin: 0;">-<span id="LC404" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC405" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPmExprCon</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">args</span></span>
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406
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<pre style="margin: 0;">-<span id="LC406" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</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;">ppr</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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407
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<pre style="margin: 0;">-<span id="LC407" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</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;">return</span> <span class="n" style="color: #333;">underscore</span> <span class="c1" style="color: #998; font-style: italic;">-- don't show</span></span>
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408
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<pre style="margin: 0;">-<span id="LC408" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</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="n" style="color: #333;">underscore</span> <span class="c1" style="color: #998; font-style: italic;">-- don't show</span></span>
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409
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<pre style="margin: 0;">-<span id="LC409" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC410" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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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411
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<pre style="margin: 0;">-<span id="LC411" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</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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412
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<pre style="margin: 0;">-<span id="LC412" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNegatedPmLit</span> <span class="n" style="color: #333;">l</span></span>
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413
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<pre style="margin: 0;">-<span id="LC413" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- will become a wildcard</span></span>
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414
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<pre style="margin: 0;">-<span id="LC414" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- will become a wildcard</span></span>
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<pre style="margin: 0;">-<span id="LC415" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="n" style="color: #333;">es</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC416" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTupleDataCon</span> <span class="n" style="color: #333;">c</span></span>
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417
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<pre style="margin: 0;">-<span id="LC417" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isConsDataCon</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">es</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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418
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<pre style="margin: 0;">-<span id="LC418" 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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419
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<pre style="margin: 0;">-<span id="LC419" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">es</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;">null</span> <span class="n" style="color: #333;">es</span><span class="p">)</span></span>
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420
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<pre style="margin: 0;">-<span id="LC420" class="line" lang="haskell"></span>
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421
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<pre style="margin: 0;">-<span id="LC421" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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422
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<pre style="margin: 0;">-<span id="LC422" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">expr</span></span>
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423
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<pre style="margin: 0;">-<span id="LC423" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">needsParens</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC424" 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;">pprPmExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC425" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC426" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">-<span id="LC427" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC428" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTupleDataCon</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTuple</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC429" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isConsDataCon</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pretty_list</span></span>
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<pre style="margin: 0;">-<span id="LC430" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC431" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTuple</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 class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">-<span id="LC432" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTuple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fsep</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span></span>
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<pre style="margin: 0;">-<span id="LC433" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC434" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- lazily, to be used in the list case only</span></span>
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<pre style="margin: 0;">-<span id="LC435" class="line" lang="haskell"> <span class="n" style="color: #333;">pretty_list</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">-<span id="LC436" class="line" lang="haskell"> <span class="n" style="color: #333;">pretty_list</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">isNilPmExpr</span> <span class="p">(</span><span class="n" style="color: #333;">last</span> <span class="n" style="color: #333;">list</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="LC437" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">brackets</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fsep</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="n" style="color: #333;">init</span> <span class="n" style="color: #333;">list</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC438" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">hcat</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">colon</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="n" style="color: #333;">list</span></span>
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<pre style="margin: 0;">-<span id="LC439" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC440" class="line" lang="haskell"> <span class="n" style="color: #333;">list</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">list_elements</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC441" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC442" class="line" lang="haskell"> <span class="n" style="color: #333;">list_elements</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC443" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">es</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">nilDataCon</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">c</span></span>
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<pre style="margin: 0;">-<span id="LC444" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">es</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC445" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">es</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">consDataCon</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">c</span></span>
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<pre style="margin: 0;">-<span id="LC446" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">list_elements</span> <span class="n" style="color: #333;">es</span></span>
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<pre style="margin: 0;">-<span id="LC447" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC448" class="line" lang="haskell"> <span class="n" style="color: #333;">list_elements</span> <span class="n" style="color: #333;">list</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"list_elements:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">list</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC449" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprCon</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC450" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">conLikeIsInfix</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">args</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC451" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">y</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">x'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">-<span id="LC452" class="line" lang="haskell"> <span class="n" style="color: #333;">y'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">-<span id="LC453" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">x'</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">y'</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC454" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- can it be infix but have more than two arguments?</span></span>
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<pre style="margin: 0;">-<span id="LC455" class="line" lang="haskell"> <span class="n" style="color: #333;">list</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"pprPmExprCon:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">list</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC456" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">args</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;">ppr</span> <span class="n" style="color: #333;">cl</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC457" 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="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;">pprPmExprWithParens</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC458" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">fsep</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cl</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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<pre style="margin: 0;">-<span id="LC459" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC262" 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;">PmLit</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC263" 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;">PmSLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pmPprHsLit</span> <span class="n" style="color: #333;">l</span></span>
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462
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<pre style="margin: 0;"> <span id="LC264" 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;">PmOLit</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">neg</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'-'</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">empty</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;">l</span></span>
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<pre style="margin: 0;"> <span id="LC265" class="line" lang="haskell"></span>
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464
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<pre style="margin: 0;">-<span id="LC464" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- not really useful for pmexprs per se</span></span>
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465
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<pre style="margin: 0;"> <span id="LC266" 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;">PmExpr</span> <span class="kr" style="font-weight: 600;">where</span></span>
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466
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<pre style="margin: 0;">-<span id="LC466" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">runPmPprM</span> <span class="p">(</span><span class="n" style="color: #333;">pprPmExpr</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span></pre>
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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269
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<pre style="margin: 0;">+<span id="LC269" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</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;">l</span></span>
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270
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<pre style="margin: 0;">+<span id="LC270" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">v</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;">v</span></span>
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271
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">angleBrackets</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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272
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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273
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTupleDataCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">comma_sep</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">args</span></span>
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274
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<pre style="margin: 0;">+<span id="LC274" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">consDataCon</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">brackets</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">comma_sep</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">list_cells</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC275" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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276
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"> <span class="n" style="color: #333;">comma_sep</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fsep</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span></span>
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277
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"> <span class="n" style="color: #333;">list_cells</span> <span class="p">(</span><span class="n" style="color: #333;">hd</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">tl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hd</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">list_cells</span> <span class="n" style="color: #333;">tl</span></span>
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278
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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"> <span class="n" style="color: #333;">list_cells</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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279
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">prec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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280
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<pre style="margin: 0;">+<span id="LC280" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cparen</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">prec</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">hcat</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cl</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">args</span><span class="p">))</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/b8dd271855dde17a19553412e9e817195c2b5362#584407121afc66978c814dbdb5c252118d27656a"><strong>compiler/deSugar/PmPpr.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cd">-- | Provides factilities for pretty-printing 'PmExpr's in a way approriate for</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- user facing pattern match warnings.</span></span>
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5
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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;">PmPpr</span> <span class="p">(</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprUncovered</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GhcPrelude</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Name</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">NameEnv</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">NameSet</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">UniqDFM</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">UniqSet</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ConLike</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DataCon</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TysWiredIn</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Outputable</span></span>
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22
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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;">Control.Monad.Trans.State.Strict</span></span>
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23
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Maybes</span></span>
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24
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Util</span></span>
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25
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TmOracle</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="cd">-- | Pretty-print the guts of an uncovered value vector abstraction, i.e., its</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- components and refutable shapes associated to any mentioned variables.</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></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Example for @([Just p, q], [p :-> [3,4], q :-> [0,5]]):</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (Just p) q</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- where p is not one of {3, 4}</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- q is not one of {0, 5}</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="n" style="color: #333;">pprUncovered</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="n" style="color: #333;">pprUncovered</span> <span class="p">(</span><span class="n" style="color: #333;">expr_vec</span><span class="p">,</span> <span class="n" style="color: #333;">refuts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fsep</span> <span class="n" style="color: #333;">vec</span> <span class="c1" style="color: #998; font-style: italic;">-- there are no literal constraints</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">fsep</span> <span class="n" style="color: #333;">vec</span><span class="p">)</span> <span class="mi" style="color: #099;">4</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"where"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">vcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">pprRefutableShapes</span> <span class="n" style="color: #333;">cs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"> <span class="n" style="color: #333;">sdoc_vec</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">expr_vec</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">vec</span><span class="p">,</span><span class="n" style="color: #333;">cs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runPmPpr</span> <span class="n" style="color: #333;">sdoc_vec</span> <span class="p">(</span><span class="n" style="color: #333;">prettifyRefuts</span> <span class="n" style="color: #333;">refuts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"><span class="cd">-- | Output refutable shapes of a variable in the form of @var is not one of {2,</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Nothing, 3}@.</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="n" style="color: #333;">pprRefutableShapes</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 class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">])</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"><span class="n" style="color: #333;">pprRefutableShapes</span> <span class="p">(</span><span class="n" style="color: #333;">var</span><span class="p">,</span> <span class="n" style="color: #333;">alts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"is not one of"</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;">pprWithCommas</span> <span class="n" style="color: #333;">ppr_alt</span> <span class="n" style="color: #333;">alts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_alt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lit</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="LC55" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- 1. Literals</span></span>
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<pre style="margin: 0;">+<span id="LC56" 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="LC57" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Starting with a function definition like:</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: Int -> Bool</span></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f 5 = True</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f 6 = True</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The uncovered set looks like:</span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> { var |> var /= 5, var /= 6 }</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="LC66" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Yet, we would like to print this nicely as follows:</span></span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x , where x not one of {5,6}</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"></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;">Since these variables will be shown to the programmer, we give them better names</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;">(t1, t2, ..) in 'prettifyRefuts', hence the SDoc in 'PrettyPmRefutEnv'.</span></span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"></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;">2. Residual Constraints</span></span>
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<pre style="margin: 0;">+<span id="LC73" 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="LC74" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Unhandled constraints that refer to HsExpr are typically ignored by the solver</span></span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(it does not even substitute in HsExpr so they are even printed as wildcards).</span></span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Additionally, the oracle returns a substitution if it succeeds so we apply this</span></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substitution to the vectors before printing them out (see function `pprOne' in</span></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Check.hs) to be more precise.</span></span>
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<pre style="margin: 0;">+<span id="LC79" 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="LC80" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"><span class="cd">-- | A 'PmRefutEnv' with pretty names for the occuring variables.</span></span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PrettyPmRefutEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DNameEnv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"><span class="cd">-- | Assigns pretty names to constraint variables in the domain of the given</span></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'PmRefutEnv'.</span></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"><span class="n" style="color: #333;">prettifyRefuts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PrettyPmRefutEnv</span></span>
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"><span class="n" style="color: #333;">prettifyRefuts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToUDFM</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">zipWith</span> <span class="n" style="color: #333;">rename</span> <span class="n" style="color: #333;">nameList</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">udfmToList</span></span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="haskell"> <span class="n" style="color: #333;">rename</span> <span class="n" style="color: #333;">new</span> <span class="p">(</span><span class="n" style="color: #333;">old</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">old</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">new</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Try nice names p,q,r,s,t before using the (ugly) t_i</span></span>
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"> <span class="n" style="color: #333;">nameList</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"> <span class="n" style="color: #333;">nameList</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">text</span> <span class="p">[</span><span class="s" style="color: #d14;">"p"</span><span class="p">,</span><span class="s" style="color: #d14;">"q"</span><span class="p">,</span><span class="s" style="color: #d14;">"r"</span><span class="p">,</span><span class="s" style="color: #d14;">"s"</span><span class="p">,</span><span class="s" style="color: #d14;">"t"</span><span class="p">]</span> <span class="o" style="font-weight: 600;">++</span></span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="p">(</span><span class="sc" style="color: #d14;">'t'</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">u</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">[(</span><span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span><span class="o" style="font-weight: 600;">..</span><span class="p">]</span> <span class="p">]</span></span>
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94
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">State</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PrettyPmRefutEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NameSet</span><span class="p">)</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (the first part of the state is read only. make it a reader?)</span></span>
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97
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"></span>
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98
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"><span class="n" style="color: #333;">runPmPpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PrettyPmRefutEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="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;">PmAltCon</span><span class="p">])])</span></span>
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99
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"><span class="n" style="color: #333;">runPmPpr</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">lit_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">is_used</span> <span class="p">(</span><span class="n" style="color: #333;">udfmToList</span> <span class="n" style="color: #333;">lit_env</span><span class="p">))</span></span>
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100
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">_lit_env</span><span class="p">,</span> <span class="n" style="color: #333;">used</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runState</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">lit_env</span><span class="p">,</span> <span class="n" style="color: #333;">emptyNameSet</span><span class="p">)</span></span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"></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;">is_used</span> <span class="p">(</span><span class="n" style="color: #333;">k</span><span class="p">,</span><span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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104
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">elemUniqSet_Directly</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">used</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;">v</span></span>
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105
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<pre style="margin: 0;">+<span id="LC105" 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;">Nothing</span></span>
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106
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"></span>
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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;">addUsed</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="nb" style="color: #0086b3;">()</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;">addUsed</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">modify</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">negated</span><span class="p">,</span> <span class="n" style="color: #333;">used</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">negated</span><span class="p">,</span> <span class="n" style="color: #333;">extendNameSet</span> <span class="n" style="color: #333;">used</span> <span class="n" style="color: #333;">x</span><span class="p">))</span></span>
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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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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"><span class="n" style="color: #333;">checkNegation</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- the clean name if it is negated</span></span>
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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;">checkNegation</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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112
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"> <span class="n" style="color: #333;">negated</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">gets</span> <span class="n" style="color: #333;">fst</span></span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupDNameEnv</span> <span class="n" style="color: #333;">negated</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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114
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">new</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">new</span></span>
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115
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"><span class="cd">-- | Pretty print a pmexpr, but remember to prettify the names of the variables</span></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that refer to neg-literals. The ones that cannot be shown are printed as</span></span>
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119
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- underscores.</span></span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkNegation</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_name</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addUsed</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">name</span></span>
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<pre style="margin: 0;">+<span id="LC125" 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;">return</span> <span class="n" style="color: #333;">underscore</span></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPmExprCon</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</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;">ppr</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</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="n" style="color: #333;">underscore</span> <span class="c1" style="color: #998; font-style: italic;">-- don't show</span></span>
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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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131
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</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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132
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNegatedPmLit</span> <span class="n" style="color: #333;">l</span></span>
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- will become a wildcard</span></span>
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134
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="n" style="color: #333;">es</span><span class="p">)</span></span>
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135
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTupleDataCon</span> <span class="n" style="color: #333;">c</span></span>
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<td class="diff-line-num new new_line" data-linenumber="136" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
136
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isConsDataCon</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">es</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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137
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<pre style="margin: 0;">+<span id="LC137" 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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138
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">es</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;">null</span> <span class="n" style="color: #333;">es</span><span class="p">)</span></span>
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139
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"></span>
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140
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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141
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">expr</span></span>
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142
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">needsParens</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="n" style="color: #333;">expr</span></span>
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143
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<pre style="margin: 0;">+<span id="LC143" 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;">pprPmExpr</span> <span class="n" style="color: #333;">expr</span></span>
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144
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="haskell"></span>
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145
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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146
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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147
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTupleDataCon</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTuple</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="n" style="color: #333;">args</span></span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isConsDataCon</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pretty_list</span></span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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150
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTuple</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 class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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151
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTuple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fsep</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span></span>
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152
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"></span>
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153
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- lazily, to be used in the list case only</span></span>
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"> <span class="n" style="color: #333;">pretty_list</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"> <span class="n" style="color: #333;">pretty_list</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">isNilPmExpr</span> <span class="p">(</span><span class="n" style="color: #333;">last</span> <span class="n" style="color: #333;">list</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">brackets</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fsep</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="n" style="color: #333;">init</span> <span class="n" style="color: #333;">list</span><span class="p">)</span></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">hcat</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">colon</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="n" style="color: #333;">list</span></span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"></span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"> <span class="n" style="color: #333;">list</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">list_elements</span> <span class="n" style="color: #333;">args</span></span>
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160
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="haskell"></span>
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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"> <span class="n" style="color: #333;">list_elements</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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162
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">es</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">nilDataCon</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">c</span></span>
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163
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">es</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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164
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">es</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">consDataCon</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">c</span></span>
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165
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">list_elements</span> <span class="n" style="color: #333;">es</span></span>
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166
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"> <span class="n" style="color: #333;">list_elements</span> <span class="n" style="color: #333;">list</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"list_elements:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">list</span><span class="p">)</span></span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprCon</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">args</span></span>
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169
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">conLikeIsInfix</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">args</span> <span class="kr" style="font-weight: 600;">of</span></span>
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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">y</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">x'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">x</span></span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"> <span class="n" style="color: #333;">y'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">x'</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">y'</span><span class="p">)</span></span>
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173
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- can it be infix but have more than two arguments?</span></span>
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174
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"> <span class="n" style="color: #333;">list</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"pprPmExprCon:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">list</span><span class="p">)</span></span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">args</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;">ppr</span> <span class="n" style="color: #333;">cl</span><span class="p">)</span></span>
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176
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<pre style="margin: 0;">+<span id="LC176" 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="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;">pprPmExprWithParens</span> <span class="n" style="color: #333;">args</span></span>
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177
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">fsep</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cl</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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178
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"></span>
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179
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="cd">-- | Check whether a literal is negated</span></span>
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180
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"><span class="n" style="color: #333;">isNegatedPmLit</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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181
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"><span class="n" style="color: #333;">isNegatedPmLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmOLit</span> <span class="n" style="color: #333;">b</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;">b</span></span>
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182
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"><span class="n" style="color: #333;">isNegatedPmLit</span> <span class="n" style="color: #333;">_other_lit</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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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"></span>
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184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"><span class="cd">-- | Check whether a PmExpr is syntactically e</span></span>
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185
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="haskell"><span class="n" style="color: #333;">isNilPmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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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186
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"><span class="n" style="color: #333;">isNilPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</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;">c</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">nilDataCon</span></span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"><span class="n" style="color: #333;">isNilPmExpr</span> <span class="n" style="color: #333;">_other_expr</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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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"></span>
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189
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"><span class="cd">-- | Check if a DataCon is (:).</span></span>
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190
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"><span class="n" style="color: #333;">isConsDataCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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191
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell"><span class="n" style="color: #333;">isConsDataCon</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">consDataCon</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">con</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/b8dd271855dde17a19553412e9e817195c2b5362#379674a5063221cec43f0f659c2eb67b30339f45"><strong>compiler/deSugar/TmOracle.hs</strong></a>
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<pre style="margin: 0;"> <span id="LC1" 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="LC2" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Author: George Karachalias <george.karachalias@cs.kuleuven.be></span></span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The term equality oracle. The main export of the module is function `tmOracle'.</span></span>
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<pre style="margin: 0;"> <span id="LC3" 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="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP, MultiWayIf #-}</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="cd">-- | The term equality oracle. The main export of the module are the functions</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'tmOracle', 'solveOneEq' and 'addSolveRefutableAltCon'.</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If you are looking for an oracle that can solve type-level constraints, look</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- at 'TcSimplify.tcCheckSatisfiability'.</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">TmOracle</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- re-exported from PmExpr</span></span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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;">PmLit</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">SimpleEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">falsePmExpr</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">eqPmLit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">filterComplex</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isNotPmExprOther</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">runPmPprM</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lhsExprToPmExpr</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">hsExprToPmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprPmExprWithParens</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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;">PmLit</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</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;">TmVarCt</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;">TmVarCtEnv</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">eqPmLit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isNotPmExprOther</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lhsExprToPmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsExprToPmExpr</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the term oracle</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;">tmOracle</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">initialTmState</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">solveOneEq</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendSubst</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">canDiverge</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;">tmOracle</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">initialTmState</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">wrapUpTmState</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">solveOneEq</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;">extendSubst</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">canDiverge</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isRigid</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addSolveRefutableAltCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lookupRefutableAltCons</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- misc.</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;"><span class="idiff left">toComplex</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">exprDeepLookup</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">pmLitType</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">flattenPmVarEnv</span></span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">exprDeepLookup</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">pmLitType</span></span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -26,16 +30,19 @@ import GhcPrelude</td>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">PmExpr</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Util</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;">Id</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;">Name</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;">Type</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;">HsLit</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;">TcHsSyn</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;">MonadUtils</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;">Util</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;">ListSetOps</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">insertNoDup</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">unionLists</span><span class="p">)</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;">Maybes</span></span>
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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;">Outputable</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="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">NameEnv</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;">UniqFM</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;">UniqDFM</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC47" 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="LC48" 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">@@ -45,202 +52,261 @@ import NameEnv</td>
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<pre style="margin: 0;"> <span id="LC52" 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="LC53" 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="LC54" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC48" class="line" lang="haskell"><span class="cd">-- | The type of substitutions.</span></span>
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<pre style="margin: 0;">-<span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NameEnv</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="cd">-- | Pretty much a @['TmVarCt']@ association list where the domain is 'Name'</span></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- instead of 'Id'. This is the type of 'tm_pos', where we store solutions for</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- rigid pattern match variables.</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">TmVarCtEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NameEnv</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"><span class="cd">-- | An environment assigning shapes to variables that immediately lead to a</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- refutation. So, if this maps @x :-> [3]@, then trying to solve a 'TmVarCt'</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- like @x ~ 3@ immediately leads to a contradiction.</span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Determinism is important since we use this for warning messages in</span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'PmPpr.pprUncovered'. We don't do the same for 'TmVarCtEnv', so that is a plain</span></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;">-- 'NameEnv'.</span></span>
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<pre style="margin: 0;">+<span id="LC66" 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="LC67" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also Note [Refutable shapes] in TmOracle.</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DNameEnv</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"><span class="cd">-- | The state of the term oracle. Tracks all term-level facts of the form "x is</span></span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @True@" ('tm_pos') and "x is not @5@" ('tm_neg').</span></span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Subject to Note [The Pos/Neg invariant].</span></span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmS</span></span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">tm_pos</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">TmVarCtEnv</span></span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A substitution with solutions we extend with every step and return as a</span></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- result. The substitution is in /triangular form/: It might map @x@ to @y@</span></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where @y@ itself occurs in the domain of 'tm_pos', rendering lookup</span></span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- non-idempotent. This means that 'varDeepLookup' potentially has to walk</span></span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- along a chain of var-to-var mappings until we find the solution but has the</span></span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- advantage that when we update the solution for @y@ above, we automatically</span></span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- update the solution for @x@ in a union-find-like fashion.</span></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Invariant: Only maps to other variables ('PmExprVar') or to WHNFs</span></span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ('PmExprLit', 'PmExprCon'). Ergo, never maps to a 'PmExprOther'.</span></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tm_neg</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</span></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Maps each variable @x@ to a list of 'PmAltCon's that @x@ definitely</span></span>
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- cannot match. Example, @x :-> [3, 4]@ means that @x@ cannot match a literal</span></span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 3 or 4. Should we later solve @x@ to a variable @y@</span></span>
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89
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ('extendSubstAndSolve'), we merge the refutable shapes of @x@ into those of</span></span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @y@. See also Note [The Pos/Neg invariant].</span></span>
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91
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [The Pos/Neg invariant]</span></span>
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<pre style="margin: 0;">+<span id="LC94" 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="LC95" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Invariant: In any 'TmState', The domains of 'tm_pos' and 'tm_neg' are disjoint.</span></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For example, it would make no sense to say both</span></span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tm_pos = [...x :-> 3 ...]</span></span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tm_neg = [...x :-> [4,42]... ]</span></span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The positive information is strictly more informative than the negative.</span></span>
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose we are adding the (positive) fact @x :-> e@ to 'tm_pos'. Then we must</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">delete any binding for @x@ from 'tm_neg', to uphold the invariant.</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But there is more! Suppose we are adding @x :-> y@ to 'tm_pos', and 'tm_neg'</span></span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">contains @x :-> cs, y :-> ds@. Then we want to update 'tm_neg' to</span></span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@y :-> (cs ++ ds)@, to make use of the negative information we have about @x@.</span></span>
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108
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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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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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">state</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">fsep</span> <span class="p">(</span><span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="p">(</span><span class="n" style="color: #333;">pos</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">neg</span><span class="p">)))</span></span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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113
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"> <span class="n" style="color: #333;">pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">pos_eq</span> <span class="p">(</span><span class="n" style="color: #333;">nonDetUFMToList</span> <span class="p">(</span><span class="n" style="color: #333;">tm_pos</span> <span class="n" style="color: #333;">state</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"> <span class="n" style="color: #333;">neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">neg_eq</span> <span class="p">(</span><span class="n" style="color: #333;">udfmToList</span> <span class="p">(</span><span class="n" style="color: #333;">tm_neg</span> <span class="n" style="color: #333;">state</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"> <span class="n" style="color: #333;">pos_eq</span> <span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">r</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;">l</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'~'</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">r</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"> <span class="n" style="color: #333;">neg_eq</span> <span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">r</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;">l</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'≁'</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">r</span></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="cd">-- | Initial state of the oracle.</span></span>
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"><span class="n" style="color: #333;">initialTmState</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"><span class="n" style="color: #333;">initialTmState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmS</span> <span class="n" style="color: #333;">emptyNameEnv</span> <span class="n" style="color: #333;">emptyDNameEnv</span></span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"><span class="cd">-- | Wrap up the term oracle's state once solving is complete. Return the</span></span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- flattened 'tm_pos' and 'tm_neg'.</span></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"><span class="n" style="color: #333;">wrapUpTmState</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TmVarCtEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"><span class="n" style="color: #333;">wrapUpTmState</span> <span class="n" style="color: #333;">solver_state</span></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">flattenTmVarCtEnv</span> <span class="p">(</span><span class="n" style="color: #333;">tm_pos</span> <span class="n" style="color: #333;">solver_state</span><span class="p">),</span> <span class="n" style="color: #333;">tm_neg</span> <span class="n" style="color: #333;">solver_state</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC51" class="line" lang="haskell"><span class="cd">-- | The environment of the oracle contains</span></span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 1. A Bool (are there any constraints we cannot handle? (PmExprOther)).</span></span>
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<pre style="margin: 0;">-<span id="LC53" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 2. A substitution we extend with every step and return as a result.</span></span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">TmOracleEnv</span> <span class="o" style="font-weight: 600;">=</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;">PmVarEnv</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"><span class="cd">-- | Flatten the triangular subsitution.</span></span>
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"><span class="n" style="color: #333;">flattenTmVarCtEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmVarCtEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TmVarCtEnv</span></span>
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="haskell"><span class="n" style="color: #333;">flattenTmVarCtEnv</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapNameEnv</span> <span class="p">(</span><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">env</span></span>
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131
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"><span class="cd">-- | Check whether a constraint (x ~ BOT) can succeed,</span></span>
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133
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- given the resulting state of the term oracle.</span></span>
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"><span class="n" style="color: #333;">canDiverge</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="haskell"><span class="n" style="color: #333;">canDiverge</span> <span class="n" style="color: #333;">x</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">standby</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">_unhandled</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="p"><span class="idiff right">))</span></span></span>
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"><span class="n" style="color: #333;">canDiverge</span> <span class="n" style="color: #333;">x</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TmS</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tm_pos</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pos</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tm_neg</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">neg</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If the variable seems not evaluated, there is a possibility for</span></span>
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<pre style="margin: 0;">-<span id="LC61" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constraint x ~ BOT to be satisfiable.</span></span>
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<pre style="margin: 0;">-<span id="LC62" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">varDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="c1" style="color: #998; font-style: italic;">-- seems not forced</span></span>
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<pre style="margin: 0;">-<span id="LC63" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If it is involved (directly or indirectly) in any equality in the</span></span>
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<pre style="margin: 0;">-<span id="LC64" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- worklist, we can assume that it is already indirectly evaluated,</span></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;">-- as a side-effect of equality checking. If not, then we can assume</span></span>
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<pre style="margin: 0;">-<span id="LC66" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that the constraint is satisfiable.</span></span>
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<pre style="margin: 0;">-<span id="LC67" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">isForcedByEq</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">standby</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">isForcedByEq</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="n" style="color: #333;">standby</span></span>
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<pre style="margin: 0;">-<span id="LC68" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Variable x is already in WHNF so the constraint is non-satisfiable</span></span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constraint x ~ BOT to be satisfiable. That's the case when we haven't found</span></span>
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a solution (i.e. some equivalent literal or constructor) for it yet.</span></span>
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">varDeepLookup</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">x</span> <span class="c1" style="color: #998; font-style: italic;">-- seems not forced</span></span>
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Even if we don't have a solution yet, it might be involved in a negative</span></span>
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constraint, in which case we must already have evaluated it earlier.</span></span>
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142
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupDNameEnv</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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144
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Variable x is already in WHNF or we know some refutable shape, so the</span></span>
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constraint is non-satisfiable</span></span>
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<pre style="margin: 0;"> <span id="LC146" 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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147
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC72" class="line" lang="haskell"> <span class="n" style="color: #333;">isForcedByEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</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="LC73" class="line" lang="haskell"> <span class="n" style="color: #333;">isForcedByEq</span> <span class="n" style="color: #333;">y</span> <span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varIn</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">e1</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">varIn</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">e2</span></span>
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<pre style="margin: 0;">-<span id="LC74" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC75" class="line" lang="haskell"><span class="cd">-- | Check whether a variable is in the free variables of an expression</span></span>
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<pre style="margin: 0;">-<span id="LC76" class="line" lang="haskell"><span class="n" style="color: #333;">varIn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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="LC77" class="line" lang="haskell"><span class="n" style="color: #333;">varIn</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC78" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">-<span id="LC79" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">es</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="p">`</span><span class="n" style="color: #333;">varIn</span><span class="p">`)</span> <span class="n" style="color: #333;">es</span></span>
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<pre style="margin: 0;">-<span id="LC80" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprLit</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="LC81" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="p">`</span><span class="n" style="color: #333;">varIn</span><span class="p">`</span> <span class="n" style="color: #333;">e1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="p">`</span><span class="n" style="color: #333;">varIn</span><span class="p">`</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC82" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprOther</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="LC83" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC84" class="line" lang="haskell"><span class="cd">-- | Flatten the DAG (Could be improved in terms of performance.).</span></span>
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<pre style="margin: 0;">-<span id="LC85" class="line" lang="haskell"><span class="n" style="color: #333;">flattenPmVarEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span></span>
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<pre style="margin: 0;">-<span id="LC86" class="line" lang="haskell"><span class="n" style="color: #333;">flattenPmVarEnv</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapNameEnv</span> <span class="p">(</span><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">env</span></span>
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<pre style="margin: 0;">-<span id="LC87" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC88" class="line" lang="haskell"><span class="cd">-- | The state of the term oracle (includes complex constraints that cannot</span></span>
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<pre style="margin: 0;">-<span id="LC89" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- progress unless we get more information).</span></span>
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<pre style="margin: 0;">-<span id="LC90" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TmOracleEnv</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC91" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC92" class="line" lang="haskell"><span class="cd">-- | Initial state of the oracle.</span></span>
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<pre style="margin: 0;">-<span id="LC93" class="line" lang="haskell"><span class="n" style="color: #333;">initialTmState</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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<pre style="margin: 0;">-<span id="LC94" class="line" lang="haskell"><span class="n" style="color: #333;">initialTmState</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</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;">emptyNameEnv</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC95" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC96" class="line" lang="haskell"><span class="cd">-- | Solve a complex equality (top-level).</span></span>
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<pre style="margin: 0;">-<span id="LC97" class="line" lang="haskell"><span class="n" style="color: #333;">solveOneEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</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;">TmState</span></span>
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98
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="haskell"><span class="n" style="color: #333;">solveOneEq</span> <span class="n" style="color: #333;">solver_env</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="n" style="color: #333;">env</span><span class="p">))</span> <span class="n" style="color: #333;">complex</span></span>
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99
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">solver_env</span> <span class="c1" style="color: #998; font-style: italic;">-- do the actual *merging* with existing state</span></span>
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100
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<pre style="margin: 0;">-<span id="LC100" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">simplifyComplexEq</span> <span class="c1" style="color: #998; font-style: italic;">-- simplify as much as you can</span></span>
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101
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<pre style="margin: 0;">-<span id="LC101" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">applySubstComplexEq</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">complex</span> <span class="c1" style="color: #998; font-style: italic;">-- replace everything we already know</span></span>
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102
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<pre style="margin: 0;">-<span id="LC102" class="line" lang="haskell"></span>
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103
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<pre style="margin: 0;">-<span id="LC103" class="line" lang="haskell"><span class="cd">-- | Solve a complex equality.</span></span>
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104
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<pre style="margin: 0;">-<span id="LC104" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Nothing => definitely unsatisfiable</span></span>
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105
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<pre style="margin: 0;">-<span id="LC105" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Just tms => I have added the complex equality and added</span></span>
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<pre style="margin: 0;">-<span id="LC106" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- it to the tmstate; the result may or may not be</span></span>
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<pre style="margin: 0;">-<span id="LC107" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- satisfiable</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;">solveComplexEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</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;">TmState</span></span>
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109
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<pre style="margin: 0;">-<span id="LC109" class="line" lang="haskell"><span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">solver_state</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">standby</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">unhandled</span><span class="p">,</span> <span class="n" style="color: #333;">env</span><span class="p">))</span> <span class="n" style="color: #333;">eq</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">e2</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;">eq</span> <span class="kr" style="font-weight: 600;">of</span></span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"><span class="cd">-- | Check whether the equality @x ~ e@ leads to a refutation. Make sure that</span></span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @x@ and @e@ are completely substituted before!</span></span>
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150
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"><span class="n" style="color: #333;">isRefutable</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</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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151
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"><span class="n" style="color: #333;">isRefutable</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">env</span></span>
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152
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">elem</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">exprToAlt</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;"><*></span> <span class="n" style="color: #333;">lookupDNameEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span></span>
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153
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"></span>
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154
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"><span class="cd">-- | Solve an equality (top-level).</span></span>
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155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"><span class="n" style="color: #333;">solveOneEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TmVarCt</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;">TmState</span></span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"><span class="n" style="color: #333;">solveOneEq</span> <span class="n" style="color: #333;">solver_env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TVC</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">solver_env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">x</span><span class="p">),</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"></span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"><span class="n" style="color: #333;">exprToAlt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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;">PmAltCon</span></span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"><span class="n" style="color: #333;">exprToAlt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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160
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="haskell"><span class="n" style="color: #333;">exprToAlt</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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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"></span>
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162
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"><span class="cd">-- | Record that a particular 'Id' can't take the shape of a 'PmAltCon' in the</span></span>
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'TmState' and return @Nothing@ if that leads to a contradiction.</span></span>
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164
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"><span class="n" style="color: #333;">addSolveRefutableAltCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</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;">TmState</span></span>
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165
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"><span class="n" style="color: #333;">addSolveRefutableAltCon</span> <span class="n" style="color: #333;">original</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmS</span><span class="p">{</span> <span class="n" style="color: #333;">tm_pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pos</span><span class="p">,</span> <span class="n" style="color: #333;">tm_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">nalt</span></span>
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166
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<pre style="margin: 0;">+<span id="LC166" 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;">exprToAlt</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">of</span></span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We have to take care to preserve Note [The Pos/Neg invariant]</span></span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">extended</span> <span class="c1" style="color: #998; font-style: italic;">-- Not solved yet</span></span>
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169
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">alt</span> <span class="c1" style="color: #998; font-style: italic;">-- We have a solution</span></span>
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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">alt</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">nalt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="c1" style="color: #998; font-style: italic;">-- ... which is contradictory</span></span>
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171
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<pre style="margin: 0;">+<span id="LC171" 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;">Just</span> <span class="n" style="color: #333;">original</span> <span class="c1" style="color: #998; font-style: italic;">-- ... which is compatible, rendering the</span></span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="c1" style="color: #998; font-style: italic;">-- refutation redundant</span></span>
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173
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varDeepLookup</span> <span class="n" style="color: #333;">pos</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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174
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"> <span class="n" style="color: #333;">extended</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">original</span> <span class="p">{</span> <span class="n" style="color: #333;">tm_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg'</span> <span class="p">}</span></span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"> <span class="n" style="color: #333;">neg'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alterDNameEnv</span> <span class="p">(</span><span class="n" style="color: #333;">delNulls</span> <span class="p">(</span><span class="n" style="color: #333;">insertNoDup</span> <span class="n" style="color: #333;">nalt</span><span class="p">))</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">y</span></span>
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176
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"></span>
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177
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"><span class="cd">-- | When updating 'tm_neg', we want to delete any 'null' entries. This adapter</span></span>
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178
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- intends to provide a suitable interface for 'alterDNameEnv'.</span></span>
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179
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="n" style="color: #333;">delNulls</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">([</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">])</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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180
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"><span class="n" style="color: #333;">delNulls</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">mb_entry</span></span>
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181
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ret</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">fromMaybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">mb_entry</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ret</span></span>
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182
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<pre style="margin: 0;">+<span id="LC182" 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;">Nothing</span></span>
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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"></span>
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184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"><span class="cd">-- | Return all 'PmAltCon' shapes that are impossible for 'Id' to take, i.e.</span></span>
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185
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- would immediately lead to a refutation by the term oracle.</span></span>
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186
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"><span class="n" style="color: #333;">lookupRefutableAltCons</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;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">]</span></span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"><span class="n" style="color: #333;">lookupRefutableAltCons</span> <span class="n" style="color: #333;">x</span> <span class="kt" style="color: #458; font-weight: 600;">TmS</span> <span class="p">{</span> <span class="n" style="color: #333;">tm_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg</span> <span class="p">}</span></span>
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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">(</span><span class="n" style="color: #333;">lookupDNameEnv</span> <span class="n" style="color: #333;">neg</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">x</span><span class="p">))</span></span>
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189
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"></span>
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190
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"><span class="cd">-- | Is the given variable /rigid/ (i.e., we have a solution for it) or</span></span>
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191
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- /flexible/ (i.e., no solution)? Returns the solution if /rigid/. A</span></span>
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192
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- semantically helpful alias for 'lookupNameEnv'.</span></span>
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193
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<pre style="margin: 0;">+<span id="LC193" class="line" lang="haskell"><span class="n" style="color: #333;">isRigid</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</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;">PmExpr</span></span>
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194
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="haskell"><span class="n" style="color: #333;">isRigid</span> <span class="kt" style="color: #458; font-weight: 600;">TmS</span><span class="p">{</span> <span class="n" style="color: #333;">tm_pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pos</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupNameEnv</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">x</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="cd">-- | @isFlexible tms = isNothing . 'isRigid' tms@</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;">isFlexible</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</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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198
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="haskell"><span class="n" style="color: #333;">isFlexible</span> <span class="n" style="color: #333;">tms</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNothing</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">isRigid</span> <span class="n" style="color: #333;">tms</span></span>
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199
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="haskell"></span>
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200
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="haskell"><span class="cd">-- | Try to unify two 'PmExpr's and record the gained knowledge in the</span></span>
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201
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'TmState'.</span></span>
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202
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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203
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns @Nothing@ when there's a contradiction. Returns @Just tms@</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;">-- when the constraint was compatible with prior facts, in which case @tms@ has</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;">-- integrated the knowledge from the equality constraint.</span></span>
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206
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="haskell"><span class="n" style="color: #333;">unify</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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207
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="haskell"><span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">tms</span> <span class="n" style="color: #333;">eq</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">e2</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;">eq</span> <span class="kr" style="font-weight: 600;">of</span></span>
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208
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We cannot do a thing about these cases</span></span>
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<pre style="margin: 0;">-<span id="LC111" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Just</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">standby</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">True</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="p"><span class="idiff right">))</span></span></span>
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112
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<pre style="margin: 0;">-<span id="LC112" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Just</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">standby</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">True</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="p"><span class="idiff right">))</span></span></span>
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209
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left right">boring</span></span></span>
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210
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</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;"><span class="idiff left right">boring</span></span></span>
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211
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"></span>
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114
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l2</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;">eqPmLit</span> <span class="n" style="color: #333;">l1</span> <span class="n" style="color: #333;">l2</span> <span class="kr" style="font-weight: 600;">of</span></span>
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115
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213
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Undecidable Equality for Overloaded Literals]</span></span>
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<pre style="margin: 0;">-<span id="LC116" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Just</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">solver_state</span></span></span>
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117
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<pre style="margin: 0;">-<span id="LC117" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nothing</span></span></span>
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left right">boring</span></span></span>
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left right">unsat</span></span></span>
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118
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216
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="haskell"></span>
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119
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217
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c1</span> <span class="n" style="color: #333;">ts1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c2</span> <span class="n" style="color: #333;">ts2</span><span class="p">)</span></span>
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120
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<pre style="margin: 0;">-<span id="LC120" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">c1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">c2</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">solver_state</span> <span class="p">(</span><span class="n" style="color: #333;">zip</span> <span class="n" style="color: #333;">ts1</span> <span class="n" style="color: #333;">ts2</span><span class="p">)</span></span>
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121
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<pre style="margin: 0;">-<span id="LC121" 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;">Nothing</span></span>
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122
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<pre style="margin: 0;">-<span id="LC122" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</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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123
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<pre style="margin: 0;">-<span id="LC123" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTruePmExpr</span> <span class="n" style="color: #333;">e1</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">solver_state</span> <span class="p">(</span><span class="n" style="color: #333;">t1</span><span class="p">,</span> <span class="n" style="color: #333;">t2</span><span class="p">)</span></span>
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124
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<pre style="margin: 0;">-<span id="LC124" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isFalsePmExpr</span> <span class="n" style="color: #333;">e1</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">eq</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">standby</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">unhandled</span><span class="p">,</span> <span class="n" style="color: #333;">env</span><span class="p">))</span></span>
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125
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<pre style="margin: 0;">-<span id="LC125" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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126
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<pre style="margin: 0;">-<span id="LC126" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTruePmExpr</span> <span class="n" style="color: #333;">e2</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">solver_state</span> <span class="p">(</span><span class="n" style="color: #333;">t1</span><span class="p">,</span> <span class="n" style="color: #333;">t2</span><span class="p">)</span></span>
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127
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<pre style="margin: 0;">-<span id="LC127" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isFalsePmExpr</span> <span class="n" style="color: #333;">e2</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">eq</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">standby</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">unhandled</span><span class="p">,</span> <span class="n" style="color: #333;">env</span><span class="p">))</span></span>
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218
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">c1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">c2</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">tms</span> <span class="p">(</span><span class="n" style="color: #333;">zip</span> <span class="n" style="color: #333;">ts1</span> <span class="n" style="color: #333;">ts2</span><span class="p">)</span></span>
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219
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unsat</span></span>
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128
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220
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="haskell"></span>
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129
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221
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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130
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<pre style="margin: 0;">-<span id="LC130" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">solver_state</span></span>
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131
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<pre style="margin: 0;">-<span id="LC131" 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;">extendSubstAndSolve</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e2</span> <span class="n" style="color: #333;">solver_state</span></span>
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132
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<pre style="margin: 0;">-<span id="LC132" class="line" lang="haskell"></span>
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133
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<pre style="margin: 0;">-<span id="LC133" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</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;">extendSubstAndSolve</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e2</span> <span class="n" style="color: #333;">solver_state</span></span>
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134
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<pre style="margin: 0;">-<span id="LC134" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">extendSubstAndSolve</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">solver_state</span></span>
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135
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<pre style="margin: 0;">-<span id="LC135" class="line" lang="haskell"></span>
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136
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<pre style="margin: 0;">-<span id="LC136" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</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;">PmExprEq</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">eq</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">standby</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">unhandled</span><span class="p">,</span> <span class="n" style="color: #333;">env</span><span class="p">))</span></span>
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137
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<pre style="margin: 0;">-<span id="LC137" class="line" lang="haskell"></span>
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138
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<pre style="margin: 0;">-<span id="LC138" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WARN</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;">text</span> <span class="s" style="color: #d14;">"solveComplexEq: Catch all"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">eq</span> <span class="p">)</span></span>
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139
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<pre style="margin: 0;">-<span id="LC139" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">standby</span><span class="p">,</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;">env</span><span class="p">))</span> <span class="c1" style="color: #998; font-style: italic;">-- I HATE CATCH-ALLS</span></span>
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140
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<pre style="margin: 0;">-<span id="LC140" class="line" lang="haskell"></span>
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141
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<pre style="margin: 0;">-<span id="LC141" class="line" lang="haskell"><span class="cd">-- | Extend the substitution and solve the (possibly updated) constraints.</span></span>
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142
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<pre style="margin: 0;">-<span id="LC142" class="line" lang="haskell"><span class="n" style="color: #333;">extendSubstAndSolve</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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143
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<pre style="margin: 0;">-<span id="LC143" class="line" lang="haskell"><span class="n" style="color: #333;">extendSubstAndSolve</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="p">(</span><span class="n" style="color: #333;">standby</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">unhandled</span><span class="p">,</span> <span class="n" style="color: #333;">env</span><span class="p">))</span></span>
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144
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<pre style="margin: 0;">-<span id="LC144" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">new_incr_state</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">simplifyComplexEq</span> <span class="n" style="color: #333;">changed</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">boring</span></span>
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="haskell"></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;">-- It's important to handle both rigid cases first, otherwise we get cyclic</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;">-- substitutions. Cf. 'extendSubstAndSolve' and</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;">-- @testsuite/tests/pmcheck/should_compile/CyclicSubst.hs@.</span></span>
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<pre style="margin: 0;">+<span id="LC227" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</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;">Just</span> <span class="n" style="color: #333;">e1'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isRigid</span> <span class="n" style="color: #333;">tms</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">tms</span> <span class="p">(</span><span class="n" style="color: #333;">e1'</span><span class="p">,</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span></span>
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229
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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230
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">e2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isRigid</span> <span class="n" style="color: #333;">tms</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">tms</span> <span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">e2'</span><span class="p">)</span></span>
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231
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<pre style="margin: 0;">+<span id="LC231" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">equate</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">tms</span><span class="p">)</span></span>
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232
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<pre style="margin: 0;">+<span id="LC232" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</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;">trySolve</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e2</span> <span class="n" style="color: #333;">tms</span></span>
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233
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">trySolve</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">tms</span></span>
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<pre style="margin: 0;">+<span id="LC234" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WARN</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;">text</span> <span class="s" style="color: #d14;">"unify: Catch all"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">eq</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="haskell"> <span class="n" style="color: #333;">boring</span> <span class="c1" style="color: #998; font-style: italic;">-- I HATE CATCH-ALLS</span></span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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238
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell"> <span class="n" style="color: #333;">boring</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;">tms</span></span>
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239
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="haskell"> <span class="n" style="color: #333;">unsat</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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240
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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">-- | Merges the equivalence classes of @x@ and @y@ by extending the substitution</span></span>
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242
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with @x :-> y@.</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;">-- Preconditions: @x /= y@ and both @x@ and @y@ are flexible (cf.</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;">-- 'isFlexible'/'isRigid').</span></span>
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<pre style="margin: 0;">+<span id="LC245" class="line" lang="haskell"><span class="n" style="color: #333;">equate</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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<pre style="margin: 0;">+<span id="LC246" class="line" lang="haskell"><span class="n" style="color: #333;">equate</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">tms</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmS</span><span class="p">{</span> <span class="n" style="color: #333;">tm_pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pos</span><span class="p">,</span> <span class="n" style="color: #333;">tm_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg</span> <span class="p">}</span></span>
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247
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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;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">/=</span> <span class="n" style="color: #333;">y</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC248" 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;">isFlexible</span> <span class="n" style="color: #333;">tms</span> <span class="n" style="color: #333;">x</span> <span class="p">)</span></span>
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249
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<pre style="margin: 0;">+<span id="LC249" 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;">isFlexible</span> <span class="n" style="color: #333;">tms</span> <span class="n" style="color: #333;">y</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC250" class="line" lang="haskell"> <span class="n" style="color: #333;">tms'</span></span>
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<pre style="margin: 0;"> <span id="LC251" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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146
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<pre style="margin: 0;">-<span id="LC146" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Apply the substitution to the worklist and partition them to the ones</span></span>
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147
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<pre style="margin: 0;">-<span id="LC147" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that had some progress and the rest. Then, recurse over the ones that</span></span>
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- had some progress. Careful about performance:</span></span>
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149
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<pre style="margin: 0;">-<span id="LC149" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Representation of Term Equalities] in deSugar/Check.hs</span></span>
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<pre style="margin: 0;">-<span id="LC150" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">changed</span><span class="p">,</span> <span class="n" style="color: #333;">unchanged</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionWith</span> <span class="p">(</span><span class="n" style="color: #333;">substComplexEq</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="n" style="color: #333;">standby</span></span>
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151
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<pre style="margin: 0;">-<span id="LC151" class="line" lang="haskell"> <span class="n" style="color: #333;">new_incr_state</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">unchanged</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">unhandled</span><span class="p">,</span> <span class="n" style="color: #333;">extendNameEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">))</span></span>
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252
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<pre style="margin: 0;">+<span id="LC252" class="line" lang="haskell"> <span class="n" style="color: #333;">pos'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendNameEnv</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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253
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Be careful to uphold Note [The Pos/Neg invariant] by merging the refuts</span></span>
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254
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<pre style="margin: 0;">+<span id="LC254" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of x into those of y</span></span>
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255
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<pre style="margin: 0;">+<span id="LC255" class="line" lang="haskell"> <span class="n" style="color: #333;">nalts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">(</span><span class="n" style="color: #333;">lookupDNameEnv</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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256
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<pre style="margin: 0;">+<span id="LC256" class="line" lang="haskell"> <span class="n" style="color: #333;">neg'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alterDNameEnv</span> <span class="p">(</span><span class="n" style="color: #333;">delNulls</span> <span class="p">(</span><span class="n" style="color: #333;">unionLists</span> <span class="n" style="color: #333;">nalts</span><span class="p">))</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">y</span></span>
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257
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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;">delFromDNameEnv</span><span class="p">`</span> <span class="n" style="color: #333;">x</span></span>
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258
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"> <span class="n" style="color: #333;">tms'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmS</span> <span class="p">{</span> <span class="n" style="color: #333;">tm_pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pos'</span><span class="p">,</span> <span class="n" style="color: #333;">tm_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg'</span> <span class="p">}</span></span>
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259
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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="cd">-- | Extend the substitution with a mapping @x: -> e@ if compatible with</span></span>
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261
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- refutable shapes of @x@ and its solution, reject (@Nothing@) otherwise.</span></span>
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262
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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263
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: @x@ is flexible (cf. 'isFlexible'/'isRigid').</span></span>
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264
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: @e@ is a 'PmExprCon' or 'PmExprLit'</span></span>
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265
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="haskell"><span class="n" style="color: #333;">trySolve</span><span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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266
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="haskell"><span class="n" style="color: #333;">trySolve</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">_tms</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmS</span><span class="p">{</span> <span class="n" style="color: #333;">tm_pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pos</span><span class="p">,</span> <span class="n" style="color: #333;">tm_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg</span> <span class="p">}</span></span>
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267
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">isFlexible</span> <span class="n" style="color: #333;">_tms</span> <span class="n" style="color: #333;">x</span> <span class="p">)</span></span>
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268
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<pre style="margin: 0;">+<span id="LC268" 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;">_is_whnf</span> <span class="n" style="color: #333;">e</span> <span class="p">)</span></span>
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269
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<pre style="margin: 0;">+<span id="LC269" class="line" lang="haskell"> <span class="n" style="color: #333;">isRefutable</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">neg</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="kt" style="color: #458; font-weight: 600;">Nothing</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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272
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TmS</span> <span class="p">(</span><span class="n" style="color: #333;">extendNameEnv</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">delFromDNameEnv</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">x</span><span class="p">))</span></span>
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273
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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274
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<pre style="margin: 0;">+<span id="LC274" class="line" lang="haskell"> <span class="n" style="color: #333;">_is_whnf</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</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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275
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<pre style="margin: 0;">+<span id="LC275" class="line" lang="haskell"> <span class="n" style="color: #333;">_is_whnf</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprLit</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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276
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"> <span class="n" style="color: #333;">_is_whnf</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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152
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277
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<pre style="margin: 0;"> <span id="LC277" class="line" lang="haskell"></span>
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153
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278
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<pre style="margin: 0;"> <span id="LC278" class="line" lang="haskell"><span class="cd">-- | When we know that a variable is fresh, we do not actually have to</span></span>
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154
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279
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<pre style="margin: 0;"> <span id="LC279" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- check whether anything changes, we know that nothing does. Hence,</span></span>
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<pre style="margin: 0;">-<span id="LC155" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">`extendSubst`</span> simply extends the substitution, unlike what</span></span>
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<pre style="margin: 0;">-<span id="LC156" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">`extendSubstAndSolve`</span> does.</span></span>
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<pre style="margin: 0;">+<span id="LC280" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">@extendSubst@</span> simply extends the substitution, unlike what</span></span>
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<pre style="margin: 0;">+<span id="LC281" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">'extendSubstAndSolve'</span> does.</span></span>
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157
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<pre style="margin: 0;"> <span id="LC282" class="line" lang="haskell"><span class="n" style="color: #333;">extendSubst</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;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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158
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="haskell"><span class="n" style="color: #333;">extendSubst</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">e</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">standby</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unhandled</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="p"><span class="idiff right">))</span></span></span>
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<pre style="margin: 0;">+<span id="LC283" class="line" lang="haskell"><span class="n" style="color: #333;">extendSubst</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;"><span class="idiff left">solver_state</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmS</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tm_pos</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pos</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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159
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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="n" style="color: #333;">isNotPmExprOther</span> <span class="n" style="color: #333;">simpl_e</span></span>
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160
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<pre style="margin: 0;">-<span id="LC160" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">standby</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unhandled</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">extendNameEnv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">simpl_e</span></span><span class="p"><span class="idiff right">))</span></span></span>
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161
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<pre style="margin: 0;">-<span id="LC161" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">standby</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">True</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="p"><span class="idiff right">))</span></span></span>
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<pre style="margin: 0;">+<span id="LC285" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">solver_state</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">tm_pos</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">extendNameEnv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">simpl_e</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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<pre style="margin: 0;">+<span id="LC286" 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;"><span class="idiff left right">solver_state</span></span></span>
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162
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287
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<pre style="margin: 0;"> <span id="LC287" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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163
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288
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<pre style="margin: 0;"> <span id="LC288" class="line" lang="haskell"> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">-<span id="LC164" class="line" lang="haskell"> <span class="n" style="color: #333;">simpl_e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">-<span id="LC165" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC166" class="line" lang="haskell"><span class="cd">-- | Simplify a complex equality.</span></span>
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<pre style="margin: 0;">-<span id="LC167" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyComplexEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span></span>
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<pre style="margin: 0;">-<span id="LC168" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyComplexEq</span> <span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC169" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC170" class="line" lang="haskell"><span class="cd">-- | Simplify an expression. The boolean indicates if there has been any</span></span>
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<pre style="margin: 0;">-<span id="LC171" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- simplification or if the operation was a no-op.</span></span>
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyPmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span></span>
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173
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Deep equalities]</span></span>
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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">of</span></span>
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175
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<pre style="margin: 0;">-<span id="LC175" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">ts</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mapAndUnzip</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">ts</span> <span class="kr" style="font-weight: 600;">of</span></span>
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176
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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ts'</span><span class="p">,</span> <span class="n" style="color: #333;">bs</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;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">ts'</span><span class="p">,</span> <span class="n" style="color: #333;">or</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span></span>
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177
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<pre style="margin: 0;">-<span id="LC177" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</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;">simplifyEqExpr</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span></span>
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178
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<pre style="margin: 0;">-<span id="LC178" class="line" lang="haskell"> <span class="n" style="color: #333;">_other_expr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">e</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- the others are terminals</span></span>
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<pre style="margin: 0;">-<span id="LC179" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="cd">-- | Simplify an equality expression. The equality is given in parts.</span></span>
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<pre style="margin: 0;">-<span id="LC181" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyEqExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">,</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="LC182" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Deep equalities]</span></span>
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<pre style="margin: 0;">-<span id="LC183" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyEqExpr</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">e2</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="LC184" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Varables</span></span>
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<pre style="margin: 0;">-<span id="LC185" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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186
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<pre style="margin: 0;">-<span id="LC186" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">truePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"></span>
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188
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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Literals</span></span>
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189
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<pre style="margin: 0;">-<span id="LC189" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l2</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;">eqPmLit</span> <span class="n" style="color: #333;">l1</span> <span class="n" style="color: #333;">l2</span> <span class="kr" style="font-weight: 600;">of</span></span>
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190
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Undecidable Equality for Overloaded Literals]</span></span>
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<pre style="margin: 0;">-<span id="LC191" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">truePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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192
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">falsePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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193
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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="c1" style="color: #998; font-style: italic;">-- Can potentially be simplified</span></span>
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195
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</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="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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196
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">e1'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">),</span> <span class="p">(</span><span class="n" style="color: #333;">e2'</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;">simplifyEqExpr</span> <span class="n" style="color: #333;">e1'</span> <span class="n" style="color: #333;">e2'</span></span>
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197
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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">e1'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">),</span> <span class="p">(</span><span class="n" style="color: #333;">e2'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">simplifyEqExpr</span> <span class="n" style="color: #333;">e1'</span> <span class="n" style="color: #333;">e2'</span></span>
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198
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<pre style="margin: 0;">-<span id="LC198" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">e1'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">),</span> <span class="p">(</span><span class="n" style="color: #333;">e2'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</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;">PmExprEq</span> <span class="n" style="color: #333;">e1'</span> <span class="n" style="color: #333;">e2'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- cannot progress</span></span>
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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200
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">e1'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">),</span> <span class="p">(</span><span class="n" style="color: #333;">e2'</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;">simplifyEqExpr</span> <span class="n" style="color: #333;">e1'</span> <span class="n" style="color: #333;">e2'</span></span>
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<td class="diff-line-num old old_line" data-linenumber="201" 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">
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;">e1'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">),</span> <span class="p">(</span><span class="n" style="color: #333;">e2'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">simplifyEqExpr</span> <span class="n" style="color: #333;">e1'</span> <span class="n" style="color: #333;">e2'</span></span>
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<td class="diff-line-num old old_line" data-linenumber="202" 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">
202
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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;">e1'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">),</span> <span class="p">(</span><span class="n" style="color: #333;">e2'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</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;">PmExprEq</span> <span class="n" style="color: #333;">e1'</span> <span class="n" style="color: #333;">e2'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- cannot progress</span></span>
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203
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<pre style="margin: 0;">-<span id="LC203" class="line" lang="haskell"></span>
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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;">-- Constructors</span></span>
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<td class="diff-line-num old old_line" data-linenumber="205" 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">
205
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c1</span> <span class="n" style="color: #333;">ts1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c2</span> <span class="n" style="color: #333;">ts2</span><span class="p">)</span></span>
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206
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">c1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">c2</span> <span class="o" style="font-weight: 600;">-></span></span>
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<td class="diff-line-num old old_line" data-linenumber="207" 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">
207
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">ts1'</span><span class="p">,</span> <span class="n" style="color: #333;">bs1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAndUnzip</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">ts1</span></span>
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208
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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;">ts2'</span><span class="p">,</span> <span class="n" style="color: #333;">bs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAndUnzip</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">ts2</span></span>
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<td class="diff-line-num old old_line" data-linenumber="209" 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">
209
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tss</span><span class="p">,</span> <span class="n" style="color: #333;">_bss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipWithAndUnzip</span> <span class="n" style="color: #333;">simplifyEqExpr</span> <span class="n" style="color: #333;">ts1'</span> <span class="n" style="color: #333;">ts2'</span></span>
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<td class="diff-line-num old old_line" data-linenumber="210" 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">
210
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<pre style="margin: 0;">-<span id="LC210" class="line" lang="haskell"> <span class="n" style="color: #333;">worst_case</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c1</span> <span class="n" style="color: #333;">ts1'</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c2</span> <span class="n" style="color: #333;">ts2'</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="211" 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">
211
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<pre style="margin: 0;">-<span id="LC211" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kr" style="font-weight: 600;">if</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;">or</span> <span class="n" style="color: #333;">bs1</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">or</span> <span class="n" style="color: #333;">bs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">worst_case</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- no progress</span></span>
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212
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<pre style="margin: 0;">-<span id="LC212" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isTruePmExpr</span> <span class="n" style="color: #333;">tss</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">truePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="213" 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">
213
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<pre style="margin: 0;">-<span id="LC213" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">any</span> <span class="n" style="color: #333;">isFalsePmExpr</span> <span class="n" style="color: #333;">tss</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">falsePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="214" 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">
214
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<pre style="margin: 0;">-<span id="LC214" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">worst_case</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="215" 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">
215
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<pre style="margin: 0;">-<span id="LC215" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">falsePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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216
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<pre style="margin: 0;">-<span id="LC216" class="line" lang="haskell"></span>
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217
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<pre style="margin: 0;">-<span id="LC217" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We cannot do anything about the rest..</span></span>
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<pre style="margin: 0;">-<span id="LC218" class="line" lang="haskell"> <span class="n" style="color: #333;">_other_equality</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">original</span><span class="p">,</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="LC219" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC220" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC221" class="line" lang="haskell"> <span class="n" style="color: #333;">original</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span> <span class="c1" style="color: #998; font-style: italic;">-- reconstruct equality</span></span>
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<pre style="margin: 0;">-<span id="LC222" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC223" class="line" lang="haskell"><span class="cd">-- | Apply an (un-flattened) substitution to a simple equality.</span></span>
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<pre style="margin: 0;">-<span id="LC224" class="line" lang="haskell"><span class="n" style="color: #333;">applySubstComplexEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span></span>
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<pre style="margin: 0;">-<span id="LC225" class="line" lang="haskell"><span class="n" style="color: #333;">applySubstComplexEq</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span><span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e2</span><span class="p">)</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="LC227" class="line" lang="haskell"><span class="cd">-- | Apply an (un-flattened) substitution to a variable.</span></span>
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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell"><span class="n" style="color: #333;">varDeepLookup</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span></span>
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<pre style="margin: 0;">-<span id="LC229" class="line" lang="haskell"><span class="n" style="color: #333;">varDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">-<span id="LC230" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupNameEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e</span> <span class="c1" style="color: #998; font-style: italic;">-- go deeper</span></span>
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<pre style="margin: 0;">-<span id="LC231" 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;">PmExprVar</span> <span class="n" style="color: #333;">x</span> <span class="c1" style="color: #998; font-style: italic;">-- terminal</span></span>
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"> <span class="n" style="color: #333;">simpl_e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">e</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">-- | Apply an (un-flattened) substitution to a variable and return its</span></span>
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- representative in the triangular substitution @env@ and the completely</span></span>
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<pre style="margin: 0;">+<span id="LC293" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- substituted expression. The latter may just be the representative wrapped</span></span>
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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with 'PmExprVar' if we haven't found a solution for it yet.</span></span>
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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell"><span class="n" style="color: #333;">varDeepLookup</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmVarCtEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</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;">PmExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"><span class="n" style="color: #333;">varDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupNameEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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297
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">varDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span></span>
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298
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- go deeper</span></span>
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299
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<pre style="margin: 0;">+<span id="LC299" 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="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- terminal</span></span>
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE varDeepLookup #-}</span></span>
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<pre style="margin: 0;"> <span id="LC301" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC302" class="line" lang="haskell"><span class="cd">-- | Apply an (un-flattened) substitution to an expression.</span></span>
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<pre style="margin: 0;">-<span id="LC235" class="line" lang="haskell"><span class="n" style="color: #333;">exprDeepLookup</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">PmVar</span>Env</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span></span>
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<pre style="margin: 0;">-<span id="LC236" class="line" lang="haskell"><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">varDeepLookup</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">x</span></span></span>
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"><span class="n" style="color: #333;">exprDeepLookup</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TmVarCt</span>Env</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span></span>
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">snd</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">varDeepLookup</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC305" class="line" lang="haskell"><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">es</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">es</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC238" class="line" lang="haskell"><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="p">(</span><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e1</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC239" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC306" class="line" lang="haskell"><span class="n" style="color: #333;">exprDeepLookup</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">other_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">other_expr</span> <span class="c1" style="color: #998; font-style: italic;">-- PmExprLit, PmExprOther</span></span>
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<pre style="margin: 0;"> <span id="LC307" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC308" class="line" lang="haskell"><span class="cd">-- | External interface to the term oracle.</span></span>
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<pre style="margin: 0;">-<span id="LC243" class="line" lang="haskell"><span class="n" style="color: #333;">tmOracle</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">ComplexEq</span></span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"><span class="n" style="color: #333;">tmOracle</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TmVarCt</span></span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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<pre style="margin: 0;"> <span id="LC310" class="line" lang="haskell"><span class="n" style="color: #333;">tmOracle</span> <span class="n" style="color: #333;">tm_state</span> <span class="n" style="color: #333;">eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">solveOneEq</span> <span class="n" style="color: #333;">tm_state</span> <span class="n" style="color: #333;">eqs</span></span>
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311
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<pre style="margin: 0;"> <span id="LC311" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC312" class="line" lang="haskell"><span class="cd">-- | Type of a PmLit</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">@@ -248,18 +314,49 @@ pmLitType :: PmLit -> Type -- should be in PmExpr but gives cyclic imports :(</td>
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<pre style="margin: 0;"> <span id="LC314" class="line" lang="haskell"><span class="n" style="color: #333;">pmLitType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmSLit</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hsLitType</span> <span class="n" style="color: #333;">lit</span></span>
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<pre style="margin: 0;"> <span id="LC315" class="line" lang="haskell"><span class="n" style="color: #333;">pmLitType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmOLit</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">overLitType</span> <span class="n" style="color: #333;">lit</span></span>
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<pre style="margin: 0;"> <span id="LC316" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Deep equalities]</span></span>
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<pre style="margin: 0;">-<span id="LC252" 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="LC253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Solving nested equalities is the most difficult part. The general strategy</span></span>
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<pre style="margin: 0;">-<span id="LC254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is the following:</span></span>
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<pre style="margin: 0;">+<span id="LC317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Refutable shapes]</span></span>
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<pre style="margin: 0;">+<span id="LC318" 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="LC319" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider a pattern match like</span></span>
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<pre style="margin: 0;">+<span id="LC321" class="line" lang="haskell"></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;"> foo x</span></span>
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<pre style="margin: 0;">+<span id="LC323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | 0 <- x = 42</span></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;"> | 0 <- x = 43</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;"> | 1 <- x = 44</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;"> | otherwise = 45</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;">This will result in the following initial matching problem:</span></span>
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"></span>
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330
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<pre style="margin: 0;">+<span id="LC330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> PatVec: x (0 <- x)</span></span>
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331
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ValVec: $tm_y</span></span>
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332
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell"></span>
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333
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Where the first line is the pattern vector and the second line is the value</span></span>
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334
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<pre style="margin: 0;">+<span id="LC334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">vector abstraction. When we handle the first pattern guard in Check, it will be</span></span>
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335
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">desugared to a match of the form</span></span>
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336
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell"></span>
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337
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<pre style="margin: 0;">+<span id="LC337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> PatVec: x 0</span></span>
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338
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ValVec: $tm_y x</span></span>
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339
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="haskell"></span>
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340
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<pre style="margin: 0;">+<span id="LC340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In LitVar, this will split the value vector abstraction for `x` into a positive</span></span>
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341
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`PmLit 0` and a negative `PmLit x [0]` value abstraction. While the former is</span></span>
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342
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">immediately matched against the pattern vector, the latter (vector value</span></span>
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343
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">abstraction `~[0] $tm_y`) is completely uncovered by the clause.</span></span>
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344
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"></span>
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345
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`pmcheck` proceeds by *discarding* the the value vector abstraction involving</span></span>
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346
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the guard to accomodate for the desugaring. But this also discards the valuable</span></span>
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347
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">information that `x` certainly is not the literal 0! Consequently, we wouldn't</span></span>
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348
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be able to report the second clause as redundant.</span></span>
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255
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349
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<pre style="margin: 0;"> <span id="LC349" class="line" lang="haskell"></span>
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256
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<pre style="margin: 0;">-<span id="LC256" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Equalities of the form (True ~ (e1 ~ e2)) are transformed to just</span></span>
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257
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<pre style="margin: 0;">-<span id="LC257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (e1 ~ e2) and then treated recursively.</span></span>
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350
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That's a typical example of why we need the term oracle, and in this specific</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;">case, the ability to encode that `x` certainly is not the literal 0. Now the</span></span>
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">term oracle can immediately refute the constraint `x ~ 0` generated by the</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;">second clause and report the clause as redundant. After the third clause, the</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;">set of such *refutable* literals is again extended to `[0, 1]`.</span></span>
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<pre style="margin: 0;"> <span id="LC355" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> * Equalities of the form (False ~ (e1 ~ e2)) cannot be analyzed unless</span></span></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;"><span class="idiff left right"> we know more about the inner equality (e1 ~ e2). That's exactly what</span></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;"><span class="idiff left right"> `simplifyEqExpr' tries to do: It takes e1 and e2 and either returns</span></span></span>
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<pre style="margin: 0;">-<span id="LC262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> truePmExpr, falsePmExpr or (e1' ~ e2') in case it is uncertain. Note</span></span></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;"><span class="idiff left right"> that it is not e but rather e', since it may perform some</span></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;"><span class="idiff left right"> simplifications deeper</span>.</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;"><span class="idiff left right">In general, we want to store a set of refutable shapes (`PmAltCon`) for each</span></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;"><span class="idiff left right">variable. That's the purpose of the `PmRefutEnv`. `addSolveRefutableAltCon` will</span></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;"><span class="idiff left right">add such a refutable mapping to the `PmRefutEnv` in the term oracles state and</span></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;"><span class="idiff left right">check if causes any immediate contradiction. Whenever we record a solution in</span></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;"><span class="idiff left right">the substitution via `extendSubstAndSolve`, the refutable environment is checked</span></span></span>
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">for any matching refutable `PmAltCon`</span>.</span></span>
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<pre style="margin: 0;"> <span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -327,6 +327,7 @@ Library</td>
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<pre style="margin: 0;"> <span id="LC327" class="line" lang="plaintext"> MkCore</span>
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="plaintext"> PprCore</span>
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<pre style="margin: 0;"> <span id="LC329" class="line" lang="plaintext"> PmExpr</span>
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330
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<pre style="margin: 0;">+<span id="LC330" class="line" lang="plaintext"> PmPpr</span>
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<pre style="margin: 0;"> <span id="LC331" class="line" lang="plaintext"> TmOracle</span>
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<pre style="margin: 0;"> <span id="LC332" class="line" lang="plaintext"> Check</span>
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="plaintext"> Coverage</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/b8dd271855dde17a19553412e9e817195c2b5362#89165943f253c43100bca06548eba40ff0519ca5"><strong>compiler/typecheck/TcEvidence.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">@@ -8,7 +8,8 @@ module TcEvidence (</td>
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8
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"> <span class="p">(</span><span class="o" style="font-weight: 600;"><.></span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpTyApps</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpEvApps</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpEvVarApps</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpTyLams</span><span class="p">,</span></span>
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10
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkWpLams</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpLet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpCastN</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpCastR</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">collectHsWrapBinders</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkWpFun</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpFuns</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">idHsWrapper</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isIdHsWrapper</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprHsWrapper</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkWpFun</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpFuns</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">idHsWrapper</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isIdHsWrapper</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isErasableHsWrapper</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprHsWrapper</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Evidence bindings</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TcEvBinds</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;">EvBindsVar</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</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">@@ -355,6 +356,21 @@ isIdHsWrapper :: HsWrapper -> Bool</td>
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<pre style="margin: 0;"> <span id="LC356" class="line" lang="haskell"><span class="n" style="color: #333;">isIdHsWrapper</span> <span class="kt" style="color: #458; font-weight: 600;">WpHole</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="LC357" class="line" lang="haskell"><span class="n" style="color: #333;">isIdHsWrapper</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="LC358" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="haskell"><span class="cd">-- | Is the wrapper erasable, i.e., will not affect runtime semantics?</span></span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell"><span class="n" style="color: #333;">isErasableHsWrapper</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</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="LC361" class="line" lang="haskell"><span class="n" style="color: #333;">isErasableHsWrapper</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span></span>
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC363" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">WpHole</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="LC364" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WpCompose</span> <span class="n" style="color: #333;">wrap1</span> <span class="n" style="color: #333;">wrap2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">wrap1</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">wrap2</span></span>
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- not so sure about WpFun. But it eta-expands, so...</span></span>
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366
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">WpFun</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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367
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">WpCast</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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368
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">WpEvLam</span><span class="p">{}</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- case in point</span></span>
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369
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">WpEvApp</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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370
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<pre style="margin: 0;">+<span id="LC370" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">WpTyLam</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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371
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">WpTyApp</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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372
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">WpLet</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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373
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"></span>
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358
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell"><span class="n" style="color: #333;">collectHsWrapBinders</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">)</span></span>
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359
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375
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<pre style="margin: 0;"> <span id="LC375" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Collect the outer lambda binders of a HsWrapper,</span></span>
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360
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376
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- stopping as soon as you get to a non-lambda binder</span></span>
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<li id="d2ddf5ce2d076f8584d9825af8ea0d7ea0a38813">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/b8dd271855dde17a19553412e9e817195c2b5362#d2ddf5ce2d076f8584d9825af8ea0d7ea0a38813"><strong>compiler/typecheck/TcRnTypes.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">@@ -391,7 +391,7 @@ data DsLclEnv = DsLclEnv {</td>
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<pre style="margin: 0;"> <span id="LC391" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- These two fields are augmented as we walk inwards,</span></span>
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392
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392
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<pre style="margin: 0;"> <span id="LC392" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- through each patttern match in turn</span></span>
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393
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<pre style="margin: 0;"> <span id="LC393" class="line" lang="haskell"> <span class="n" style="color: #333;">dsl_dicts</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;">EvVar</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- Constraints from GADT pattern-matching</span></span>
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394
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<pre style="margin: 0;">-<span id="LC394" class="line" lang="haskell"> <span class="n" style="color: #333;">dsl_tm_cs</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;"><span class="idiff left">SimpleEq</span></span><span class="p"><span class="idiff right">,</span></span> <span class="c1" style="color: #998; font-style: italic;">-- Constraints form term-level pattern matching</span></span>
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394
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<pre style="margin: 0;">+<span id="LC394" class="line" lang="haskell"> <span class="n" style="color: #333;">dsl_tm_cs</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;"><span class="idiff left">TmVarCt</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span> <span class="c1" style="color: #998; font-style: italic;">-- Constraints form term-level pattern matching</span></span>
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395
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395
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<pre style="margin: 0;"> <span id="LC395" class="line" lang="haskell"></span>
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396
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<pre style="margin: 0;"> <span id="LC396" class="line" lang="haskell"> <span class="n" style="color: #333;">dsl_pm_iter</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IORef</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="c1" style="color: #998; font-style: italic;">-- Number of iterations for pmcheck so far</span></span>
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397
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<pre style="margin: 0;"> <span id="LC397" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We fail if this gets too big</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">@@ -1020,7 +1020,7 @@ splice. In particular it is not set when the splice is renamed or typechecked.</td>
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'RunSplice' is needed to provide a reference where 'addModFinalizer' can insert</span></span>
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1021
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the finalizer (see Note [Delaying modFinalizers in untyped splices]), and</span></span>
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1022
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1022
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<pre style="margin: 0;"> <span id="LC1022" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'addModFinalizer' runs when doing Q things. Therefore, It doesn't make sense to</span></span>
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<pre style="margin: 0;">-<span id="LC1023" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">set 'RunSplice' when renaming or typechecking the splice, where 'Splice',<span class="idiff left right"> </span></span></span>
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1023
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">set 'RunSplice' when renaming or typechecking the splice, where 'Splice',</span></span>
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1024
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1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'Brack' or 'Comp' are used instead.</span></span>
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1025
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"></span>
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1026
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<li id="2cbc08c5f3b1dcbc9c763a836b51491224c05e50">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/b8dd271855dde17a19553412e9e817195c2b5362#2cbc08c5f3b1dcbc9c763a836b51491224c05e50"><strong>compiler/utils/ListSetOps.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">@@ -14,7 +14,7 @@ module ListSetOps (</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Assoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assocMaybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assocUsing</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assocDefault</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assocDefaultUsing</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"></span>
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16
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Duplicate handling</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;">hasNoDups</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">removeDups</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">findDupsEq</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;">hasNoDups</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">removeDups</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">findDupsEq</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">insertNoDup</span></span><span class="p"><span class="idiff right">,</span></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;">equivClasses</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Indexing</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">@@ -169,3 +169,10 @@ findDupsEq _ [] = []</td>
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169
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"><span class="n" style="color: #333;">findDupsEq</span> <span class="n" style="color: #333;">eq</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">eq_xs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findDupsEq</span> <span class="n" style="color: #333;">eq</span> <span class="n" style="color: #333;">xs</span></span>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:|</span> <span class="n" style="color: #333;">eq_xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">findDupsEq</span> <span class="n" style="color: #333;">eq</span> <span class="n" style="color: #333;">neq_xs</span></span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="p">(</span><span class="n" style="color: #333;">eq_xs</span><span class="p">,</span> <span class="n" style="color: #333;">neq_xs</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="n" style="color: #333;">eq</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">xs</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="LC173" class="line" lang="haskell"><span class="cd">-- | \( O(n) \). @'insertNoDup' x xs@ treats @xs@ as a set, inserting @x@ only</span></span>
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174
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- when an equal element couldn't be found in @xs@.</span></span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"><span class="n" style="color: #333;">insertNoDup</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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176
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"><span class="n" style="color: #333;">insertNoDup</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">set</span></span>
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177
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">elem</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">set</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">set</span></span>
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">set</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/b8dd271855dde17a19553412e9e817195c2b5362#f5ceb0b7241ce85056c2d6adcebc29def2f0160d"><strong>testsuite/tests/pmcheck/should_compile/CyclicSubst.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cd">-- | The following match demonstrates why we need to detect cyclic solutions</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- when extending 'TmOracle.tm_pos'.</span></span>
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<pre style="margin: 0;">+<span id="LC3" 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="LC4" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TLDR; solving @x :-> y@ where @x@ is the representative of @y@'s equivalence</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- class can easily lead to a cycle in the substitution.</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">CyclicSubst</span> <span class="kr" style="font-weight: 600;">where</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="cd">-- | The match is translated to @b | a <- b@, the initial unification variable</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- is @a@ (for some reason). VarVar will assign @b :-> a@ in the match of @a@</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- against @b@ (vars occuring in a pattern are flexible). The @PmGrd a b@ is</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- desugared as a match of @$pm_x@ against @a@, where @$pm_x :-> b@, which is</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- stored as @$pm_x :-> a@ due to the previous solution. Now, VarVar will</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- assign @a :-> $pm_x@, causing a cycle.</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">foo</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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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">foo</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">b</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/b8dd271855dde17a19553412e9e817195c2b5362#ee1c3a4519d8bb6d9bff9f229a7c6364a9d2f3a9"><strong>testsuite/tests/pmcheck/should_compile/PmExprVars.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">PmExprVars</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cd">-- | Demonstrates why we can't lower constructors as flexible meta variables.</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If we did, we'd get a warning that cases 1 and 2 were redundant, implying</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- cases 0 and 3 are not. Arguably this might be better than not warning at</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- all, but it's very surprising having to supply the third case but not the</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- first two cases. And it's probably buggy somwhere else. Delete this when we</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- detect that all but the last case is redundant.</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">consAreRigid</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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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">consAreRigid</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="mi" style="color: #099;">2</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="mi" style="color: #099;">3</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">D</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;">A</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">B</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">D</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"> <span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">A</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">B</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="cd">-- | Demonstrates why we can't translate arbitrary 'HsVar'</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;">-- occurrences as 'PmExprVar's (i.e., meta variables). If we did, the following</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- would warn that the cases 1 and 2 were redundant, which is clearly wrong</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (case 1 is the only match). This is an artifact of translating from the</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- non-desugared 'HsExpr'. If we were to implement 'hsExprToPmExpr' in terms of</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'CoreExpr', we'd see the dictionary application and all would be well. The</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- solution is to look into the outer 'HsWrap' and determine whether we apply</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- or abstract over any evidence variables.</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="n" style="color: #333;">dictVarsAreTypeIndexed</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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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="n" style="color: #333;">dictVarsAreTypeIndexed</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">D</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">D</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">-></span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">B</span> <span class="o" style="font-weight: 600;">-></span> <span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">B</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">D</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">-></span> <span class="mi" style="color: #099;">2</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">B</span> <span class="o" style="font-weight: 600;">-></span> <span class="mi" style="color: #099;">3</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/b8dd271855dde17a19553412e9e817195c2b5362#96035123df876ad65bdcca4979d7aee721637509"><strong>testsuite/tests/pmcheck/should_compile/T12949.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ScopedTypeVariables #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T12949</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"> <span class="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Result</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Neither</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">This</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;">That</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Both</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">q</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Result</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">q</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">of</span></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Neither</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">That</span> <span class="n" style="color: #333;">c</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">This</span> <span class="n" style="color: #333;">i</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Both</span> <span class="n" style="color: #333;">i</span> <span class="n" style="color: #333;">c</span></span></pre>
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<li id="a52966ece03f9e76a93a2c4ea96b9fb25368723d">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/b8dd271855dde17a19553412e9e817195c2b5362#a52966ece03f9e76a93a2c4ea96b9fb25368723d"><strong>testsuite/tests/pmcheck/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -94,8 +94,13 @@ test('pmc007', [], compile,</td>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="perl"> <span class="p">[</span><span class="s" style="color: #d14;">'-fwarn-incomplete-patterns -fwarn-overlapping-patterns'</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T11245'</span><span class="p">,</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="perl"> <span class="p">[</span><span class="s" style="color: #d14;">'-fwarn-incomplete-patterns -fwarn-overlapping-patterns'</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T12949'</span><span class="p">,</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">'-fwarn-overlapping-patterns'</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T12957'</span><span class="p">,</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">'-fwarn-overlapping-patterns'</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T12957a'</span><span class="p">,</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">'-fwarn-overlapping-patterns'</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'PmExprVars'</span><span class="p">,</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="perl"> <span class="p">[</span><span class="s" style="color: #d14;">'-fwarn-incomplete-patterns -fwarn-overlapping-patterns'</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'CyclicSubst'</span><span class="p">,</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="perl"> <span class="p">[</span><span class="s" style="color: #d14;">'-fwarn-incomplete-patterns -fwarn-overlapping-patterns'</span><span class="p">])</span></span>
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104
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># EmptyCase</span></span>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T10746'</span><span class="p">,</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/b8dd271855dde17a19553412e9e817195c2b5362#3be62e19effdae9d8c3e1d67dadcd219b365dcb5"><strong>testsuite/tests/typecheck/should_compile/T5490.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">T5490.hs:246:5: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> Pattern match is redundant</span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> In a case alternative: HDropZero -> ...</span>
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5
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T5490.hs:295:5: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> Pattern match is redundant</span>
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8
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> In a case alternative: _ -> ...</span></pre>
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