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<h3>

Sebastian Graf pushed to branch wip/pmcheck-ncon

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/f74046b852ed6584e0b03ae7b10e513c3c43715e">f74046b8</a></strong>

<div>

<span>by Sebastian Graf</span>

<i>at 2019-06-23T14:46:23Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disentangle refutable altcons into literals and conlikes

</pre>

</li>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/407f6077ed8be976570c134bc747f5c5720f897a">407f6077</a></strong>

<div>

<span>by Sebastian Graf</span>

<i>at 2019-06-24T06:50:54Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Equality of PmAltCons is not always decidable

</pre>

</li>

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<h4>5 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

</a>

</li>

<li class="file-stats">

<a href="#7589abbc710cc40f6e48245c2bc16d69f556b714">

compiler/deSugar/PmExpr.hs

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<li class="file-stats">

<a href="#584407121afc66978c814dbdb5c252118d27656a">

compiler/deSugar/PmPpr.hs

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<li class="file-stats">

<a href="#379674a5063221cec43f0f659c2eb67b30339f45">

compiler/deSugar/TmOracle.hs

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</li>

</ul>

<h4>Changes:</h4>

<li id="49d2d51d42e9c209de33c35681b9c9b1e912cda9">

<a href="https://gitlab.haskell.org/ghc/ghc/compare/310027eae433147fa7b3de6e6c840c7d28f37c0c...407f6077ed8be976570c134bc747f5c5720f897a#49d2d51d42e9c209de33c35681b9c9b1e912cda9"><strong>compiler/basicTypes/NameEnv.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="27" 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="27" 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">@@ -27,7 +27,7 @@ module NameEnv (</td>

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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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<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="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 old_line" data-linenumber="30" 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="LC30" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">alterDNameEnv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendDNameEnv_C</span><span class="p">,</span></span>

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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">a<span class="idiff left">djustDNameEnv</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">a</span>lterDNameEnv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendDNameEnv_C</span><span class="p">,</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;">-- ** Dependency analysis</span></span>

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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">depAnal</span></span>

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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell">    <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="154" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -154,6 +154,9 @@ delFromDNameEnv = delFromUDFM</td>

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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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<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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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"><span class="n" style="color: #333;">adjustDNameEnv</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;">a</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;">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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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"><span class="n" style="color: #333;">adjustDNameEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adjustUDFM</span></span>

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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"><span class="n" style="color: #333;">alterDNameEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</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="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;">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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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"><span class="n" style="color: #333;">alterDNameEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alterUDFM</span></span>

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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"></span>

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<li id="bd37d71fa68b0980d832d992b427fd6a6bdb891d">

<a href="https://gitlab.haskell.org/ghc/ghc/compare/310027eae433147fa7b3de6e6c840c7d28f37c0c...407f6077ed8be976570c134bc747f5c5720f897a#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">@@ -628,11 +628,8 @@ normaliseValAbs delta = runMaybeT . go_va delta</td>

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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell">      <span class="c1" style="color: #998; font-style: italic;">-- @PmCon@ for better readability of warning messages.</span></span>

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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell">      <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">incomplete_grps</span> <span class="kr" style="font-weight: 600;">of</span></span>

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<pre style="margin: 0;"> <span id="LC630" class="line" lang="haskell">        <span class="p">([</span><span class="n" style="color: #333;">con</span><span class="p">]</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;">all</span> <span class="p">(</span><span class="o" style="font-weight: 600;">==</span> <span class="p">[</span><span class="n" style="color: #333;">con</span><span class="p">])</span> <span class="n" style="color: #333;">incomplete_grps</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="LC631" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- We don't want to simplify to a @PmCon@ (which won't normalise</span></span>

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<pre style="margin: 0;">-<span id="LC632" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- any further) when @p@ is just the 'cheapInhabitationTest'.</span></span>

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<pre style="margin: 0;">-<span id="LC633" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- Thus, we have to assert satisfiability here, even if the</span></span>

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<pre style="margin: 0;">-<span id="LC634" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- expensive 'isConSatisfiable' already did so. Also, we have to</span></span>

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<pre style="margin: 0;">-<span id="LC635" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- store the constraints in @delta@.</span></span>

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<pre style="margin: 0;">+<span id="LC631" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- mkOneSatisfiableConFull, so that the new constraint x ~ con is</span></span>

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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- recorded in delta'</span></span>

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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell">          <span class="p">(</span><span class="n" style="color: #333;">delta'</span><span class="p">,</span> <span class="n" style="color: #333;">ic</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkOneSatisfiableConFull</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span></span>

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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell">          <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"normaliseValAbs2"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">ic_val_abs</span> <span class="n" style="color: #333;">ic</span><span class="p">))</span></span>

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<pre style="margin: 0;"> <span id="LC635" class="line" lang="haskell">          <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">delta'</span><span class="p">,</span> <span class="n" style="color: #333;">ic_val_abs</span> <span class="n" style="color: #333;">ic</span><span class="p">)</span></span>

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<li id="7589abbc710cc40f6e48245c2bc16d69f556b714">

<a href="https://gitlab.haskell.org/ghc/ghc/compare/310027eae433147fa7b3de6e6c840c7d28f37c0c...407f6077ed8be976570c134bc747f5c5720f897a#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">@@ -10,7 +10,8 @@ Haskell expressions (as used by the pattern matching checker) and utilities.</td>

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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="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 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;">mkPmExprLit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pmExprAsList</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;">mkPmExprLit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">decEqPmAltCon</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;">injectPmAltCons</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pmExprAsList</span></span>

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<pre style="margin: 0;"> <span id="LC15" 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="LC16" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC17" 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">@@ -63,7 +64,31 @@ data PmExpr = PmExprVar   Name</td>

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<pre style="margin: 0;"> <span id="LC64" 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="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</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;">PmSLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsLit</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;">-- simple</span></span>

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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell">           <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmOLit</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="cm" style="color: #998; font-style: italic;">{- is it negated? -}</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsOverLit</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;">-- overloaded</span></span>

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<pre style="margin: 0;">-<span id="LC66" class="line" lang="haskell">           <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span></span>

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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="cd">-- | Decidable equality for values represented by 'PmLit's.</span></span>

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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Undecidable Equality for Overloaded Literals]</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"><span class="n" style="color: #333;">decEqPmLit</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;">PmLit</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;">Bool</span></span>

</pre>

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71

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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"><span class="n" style="color: #333;">decEqPmLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmSLit</span>    <span class="n" style="color: #333;">l1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmSLit</span>    <span class="n" style="color: #333;">l2</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;">l1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">l2</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"><span class="n" style="color: #333;">decEqPmLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmOLit</span> <span class="n" style="color: #333;">b1</span> <span class="n" style="color: #333;">l1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmOLit</span> <span class="n" style="color: #333;">b2</span> <span class="n" style="color: #333;">l2</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">b1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">b2</span><span class="p">,</span> <span class="n" style="color: #333;">l1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">l2</span></span>

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74

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<pre style="margin: 0;">+<span id="LC74" 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="kt" style="color: #458; font-weight: 600;">True</span></span>

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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"><span class="n" style="color: #333;">decEqPmLit</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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76

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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"></span>

</pre>

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77

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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Syntactic equality.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC78" 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;">PmLit</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell">  <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;">decEqPmLit</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;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>

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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"><span class="cd">-- | Decidable equality for values represented by 'ConLike's.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'PatSynCon's aren't enforced to be injective, so two syntactically different</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'PatSynCon's might match the exact same values. Without looking into and</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- reasoning about the pattern synonym's definition, we can't decide if their</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- sets of matched values is different.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"><span class="n" style="color: #333;">decEqConLike</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="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>

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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"><span class="n" style="color: #333;">decEqConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc2</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;">dc1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">dc2</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"><span class="n" style="color: #333;">decEqConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="n" style="color: #333;">psc1</span><span class="p">)</span>  <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="n" style="color: #333;">psc2</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC89" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">psc1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">psc2</span></span>

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<pre style="margin: 0;">+<span id="LC90" 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="kt" style="color: #458; font-weight: 600;">True</span></span>

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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"><span class="n" style="color: #333;">decEqConLike</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="LC92" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"><span class="cd">-- | Represents a match against a 'ConLike' or literal. We mostly use it to</span></span>

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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to encode shapes for a variable that immediately lead to a refutation.</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">@@ -71,7 +96,18 @@ data PmLit = PmSLit (HsLit GhcTc)                               -- simple</td>

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<pre style="margin: 0;"> <span id="LC96" 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="LC97" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</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;">PmAltConLike</span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span></span>

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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell">              <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span>     <span class="kt" style="color: #458; font-weight: 600;">PmLit</span></span>

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<pre style="margin: 0;">-<span id="LC74" class="line" lang="haskell">              <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span></span>

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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"><span class="cd">-- | We can't in general decide whether two 'PmAltCon's match the same set of</span></span>

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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- values. In addition to the reasons in 'decEqPmLit' and 'decEqConLike', a</span></span>

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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'PmAltConLike' might or might not represent the same value as a 'PmAltLit'.</span></span>

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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"><span class="n" style="color: #333;">decEqPmAltCon</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;">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;">Bool</span></span>

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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"><span class="n" style="color: #333;">decEqPmAltCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">decEqConLike</span> <span class="n" style="color: #333;">cl1</span> <span class="n" style="color: #333;">cl2</span></span>

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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"><span class="n" style="color: #333;">decEqPmAltCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span>     <span class="n" style="color: #333;">l1</span><span class="p">)</span>  <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span>     <span class="n" style="color: #333;">l2</span><span class="p">)</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">decEqPmLit</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="LC106" class="line" lang="haskell"><span class="n" style="color: #333;">decEqPmAltCon</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="LC107" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Syntactic equality.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC109" 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="LC110" class="line" lang="haskell">  <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;">decEqPmAltCon</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;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>

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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"><span class="n" style="color: #333;">mkPmExprData</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">]</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="LC113" class="line" lang="haskell"><span class="n" style="color: #333;">mkPmExprData</span> <span class="n" style="color: #333;">dc</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">))</span> <span class="n" style="color: #333;">args</span></span>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<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 +115,9 @@ mkPmExprData dc args = PmExprCon (PmAltConLike (RealDataCon dc)) args</td>

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<pre style="margin: 0;"> <span id="LC115" class="line" lang="haskell"><span class="n" style="color: #333;">mkPmExprLit</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;">PmExpr</span></span>

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<pre style="margin: 0;"> <span id="LC116" class="line" lang="haskell"><span class="n" style="color: #333;">mkPmExprLit</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;">PmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>

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<pre style="margin: 0;"> <span id="LC117" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="n" style="color: #333;">injectPmAltCons</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;">ConLike</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>

</pre>

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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"><span class="n" style="color: #333;">injectPmAltCons</span> <span class="n" style="color: #333;">lits</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">lits</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">map</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cls</span></span>

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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"></span>

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82

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<pre style="margin: 0;"> <span id="LC121" 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="LC122" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

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<td class="diff-line-num old_line" data-linenumber="84" 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="123" 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="LC123" 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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<li id="584407121afc66978c814dbdb5c252118d27656a">

<a href="https://gitlab.haskell.org/ghc/ghc/compare/310027eae433147fa7b3de6e6c840c7d28f37c0c...407f6077ed8be976570c134bc747f5c5720f897a#584407121afc66978c814dbdb5c252118d27656a"><strong>compiler/deSugar/PmPpr.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="94" 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="94" 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">@@ -94,7 +94,7 @@ type PrettyPmRefutEnv = DNameEnv (SDoc, [PmAltCon])</td>

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<pre style="margin: 0;"> <span id="LC94" 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="LC95" 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="LC96" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">-<span id="LC97" 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="p">(</span><span class="n" style="color: #333;">_ty</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">lits</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="n" style="color: #333;"><span class="idiff">old</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">new</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">lit</span>s</span><span class="p">))</span></span>

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<pre style="margin: 0;">+<span id="LC97" 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="p">(</span><span class="n" style="color: #333;">_ty</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">nlits</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ncls</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="n" style="color: #333;"><span class="idiff">old</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">new</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">injectPmAltCons</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nlits</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ncl</span>s</span><span class="p">))</span></span>

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<pre style="margin: 0;"> <span id="LC98" 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="LC99" 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="LC100" 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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<li id="379674a5063221cec43f0f659c2eb67b30339f45">

<a href="https://gitlab.haskell.org/ghc/ghc/compare/310027eae433147fa7b3de6e6c840c7d28f37c0c...407f6077ed8be976570c134bc747f5c5720f897a#379674a5063221cec43f0f659c2eb67b30339f45"><strong>compiler/deSugar/TmOracle.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="14" 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="14" 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">@@ -14,7 +14,7 @@ module TmOracle (</td>

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<pre style="margin: 0;"> <span id="LC14" 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="LC15" 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;">TmVarCtEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</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>

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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell">        <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 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="LC17" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">tryAddRefutableAltCon</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">lookupRefutableAltCons</span></span><span class="p"><span class="idiff right">,</span></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;">tryAddRefutableAltCon</span><span class="p">,</span></span>

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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell">        <span class="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;">exprDeepLookup</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pmLitType</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="33" 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="33" 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">@@ -33,6 +33,7 @@ import NameEnv</td>

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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;">UniqFM</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;">UniqDFM</span></span>

</pre>

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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;">Type</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;">ConLike</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>

</pre>

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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>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="63" 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="64" 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">@@ -63,7 +64,7 @@ type TmVarCtEnv = NameEnv PmExpr</td>

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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'NameEnv'.</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC65" 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="LC66" 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="LC66" 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;">Type</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Pm<span class="idiff left right">AltCon</span></span><span class="p">])</span></span>

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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">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;">Type</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Pm<span class="idiff left">Lit</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 right">ConLike</span></span><span class="p">])</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="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="LC70" 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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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -117,7 +118,9 @@ instance Outputable TmState where</td>

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<pre style="margin: 0;"> <span id="LC118" 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="LC119" 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="LC120" 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="LC120" 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;">text</span> <span class="s" 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="LC121" 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="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">,</span> <span class="n" style="color: #333;">cls</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hsep</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 class="n" style="color: #333;">dcolon</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"/~"</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">alts</span><span class="p">]</span></span>

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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell">        <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell">          <span class="n" style="color: #333;">alts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">injectPmAltCons</span> <span class="n" style="color: #333;">lits</span> <span class="n" style="color: #333;">cls</span></span>

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<pre style="margin: 0;"> <span id="LC124" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC125" class="line" lang="haskell"><span class="cd">-- | Initial state of the oracle.</span></span>

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<pre style="margin: 0;"> <span id="LC126" 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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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="154" 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="157" 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">@@ -154,8 +157,10 @@ canDiverge x TmS{ tm_pos = pos, tm_neg = neg }</td>

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<pre style="margin: 0;"> <span id="LC157" 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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="155" 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">

155

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<td class="diff-line-num new_line" data-linenumber="158" 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="LC158" 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 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="kr" style="font-weight: 600;">do</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="156" 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="159" 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="LC159" class="line" lang="haskell">  <span class="n" style="color: #333;">alt</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>

</pre>

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157

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<pre style="margin: 0;">-<span id="LC157" class="line" lang="haskell">  <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">nalts</span><span class="p">)</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>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="160" 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="LC158" class="line" lang="haskell">  <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">elem</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">nalts</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="160" 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="LC160" class="line" lang="haskell">  <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">nlits</span><span class="p">,</span> <span class="n" style="color: #333;">ncls</span><span class="p">)</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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="161" 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="LC161" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">alt</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="159" 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="LC162" class="line" lang="haskell">    <span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">lit</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">elem</span> <span class="n" style="color: #333;">lit</span> <span class="n" style="color: #333;">nlits</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="163" 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="LC163" class="line" lang="haskell">    <span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">elem</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">ncls</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="164" 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="LC164" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="160" 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="LC165" class="line" lang="haskell"><span class="cd">-- | Solve an equality (top-level).</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="161" 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="166" 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="LC166" 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>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="172" 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="177" 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">@@ -172,30 +177,30 @@ tryAddRefutableAltCon original@TmS{ tm_pos = pos, tm_neg = neg } x nalt</td>

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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="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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<td class="diff-line-num old_line" data-linenumber="173" 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="178" 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">

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;">-- We have to take care to preserve Note [The Pos/Neg invariant]</span></span>

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<td class="diff-line-num old_line" data-linenumber="174" 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="179" 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="LC179" 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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<td class="diff-line-num old old_line" data-linenumber="175" 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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<td class="diff-line-num new_line old" data-linenumber="180" 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="LC175" 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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<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;">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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="177" 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">

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;">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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="178" 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">

178

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<pre style="margin: 0;">-<span id="LC178" 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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="179" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="180" 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="LC180" 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="o" style="font-weight: 600;">-></span>               <span class="c1" style="color: #998; font-style: italic;">-- We have a solution</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="179" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="181" 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="LC181" class="line" lang="haskell">        <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">decEqPmAltCon</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">nalt</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="182" 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="LC182" class="line" lang="haskell">          <span class="kt" style="color: #458; font-weight: 600;">Just</span> <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;">Nothing</span>       <span class="c1" style="color: #998; font-style: italic;">-- ... which is contradictory</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="179" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="183" 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="LC183" class="line" lang="haskell">          <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="179" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="184" 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="LC184" class="line" lang="haskell">                                      <span class="c1" style="color: #998; font-style: italic;">--     refutation redundant</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="185" 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="LC185" 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;">-- ... which is incomparable, so might</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="186" 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="LC186" class="line" lang="haskell">                                      <span class="c1" style="color: #998; font-style: italic;">--     refute later</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="187" 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">

187

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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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179

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<td class="diff-line-num new_line" data-linenumber="188" 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="LC188" 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>

</pre>

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<td class="diff-line-num new_line" data-linenumber="189" 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="LC189" 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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="181" 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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<td class="diff-line-num new_line old" data-linenumber="190" 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="LC181" 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;">extendDNameEnv_C</span> <span class="n" style="color: #333;">combineRefutEntries</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">y</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">nalt</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="190" 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">

190

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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell">    <span class="n" style="color: #333;">entry</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">nalt</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="182" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="191" 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="LC191" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">nlit</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">nlit</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC192" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">ncl</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">ncl</span><span class="p">])</span></span>

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<pre style="margin: 0;">+<span id="LC193" 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;">extendDNameEnv_C</span> <span class="n" style="color: #333;">combineRefutEntries</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">entry</span></span>

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<pre style="margin: 0;"> <span id="LC194" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC195" class="line" lang="haskell"><span class="cd">-- | Combines two entries in a 'PmRefutEnv' by merging the set of refutable</span></span>

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<pre style="margin: 0;"> <span id="LC196" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'PmAltCon's.</span></span>

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<pre style="margin: 0;">-<span id="LC185" class="line" lang="haskell"><span class="n" style="color: #333;">combineRefutEntries</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="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;">Type</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 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="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="LC186" class="line" lang="haskell"><span class="n" style="color: #333;">combineRefutEntries</span> <span class="p">(</span><span class="n" style="color: #333;">old_ty</span><span class="p">,</span> <span class="n" style="color: #333;">old_nalts</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">new_ty</span><span class="p">,</span> <span class="n" style="color: #333;">new_nalts</span><span class="p">)</span></span>

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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">eqType</span> <span class="n" style="color: #333;">old_ty</span> <span class="n" style="color: #333;">new_ty</span> <span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">old_ty</span><span class="p">,</span> <span class="n" style="color: #333;">unionLists</span> <span class="n" style="color: #333;">old_nalts</span> <span class="n" style="color: #333;">new_nalts</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC189" 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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<pre style="margin: 0;">-<span id="LC190" 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>

</pre>

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<pre style="margin: 0;">-<span id="LC191" 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="LC192" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note that because of Note [The Pos/Neg invariant], this will return an empty</span></span>

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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- list of alt cons for 'Id's which already have a solution.</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC194" 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;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</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>

</pre>

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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"><span class="n" style="color: #333;">lookupRefutableAltCons</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 class="n" style="color: #333;">x</span></span>

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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</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;">y</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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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;">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>

</pre>

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<pre style="margin: 0;">+<span id="LC197" class="line" lang="haskell"><span class="n" style="color: #333;">combineRefutEntries</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC198" 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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmLit</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ConLike</span><span class="p">])</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC199" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</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 class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ConLike</span><span class="p">])</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC200" 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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmLit</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ConLike</span><span class="p">])</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC201" class="line" lang="haskell"><span class="n" style="color: #333;">combineRefutEntries</span> <span class="p">(</span><span class="n" style="color: #333;">old_ty</span><span class="p">,</span> <span class="n" style="color: #333;">old_nlits</span><span class="p">,</span> <span class="n" style="color: #333;">old_ncls</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">new_ty</span><span class="p">,</span> <span class="n" style="color: #333;">new_nlits</span><span class="p">,</span> <span class="n" style="color: #333;">new_ncls</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC202" 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;">eqType</span> <span class="n" style="color: #333;">old_ty</span> <span class="n" style="color: #333;">new_ty</span> <span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC203" class="line" lang="haskell">    <span class="p">(</span><span class="n" style="color: #333;">old_ty</span><span class="p">,</span> <span class="n" style="color: #333;">unionLists</span> <span class="n" style="color: #333;">old_nlits</span> <span class="n" style="color: #333;">new_nlits</span><span class="p">,</span> <span class="n" style="color: #333;">unionLists</span> <span class="n" style="color: #333;">old_ncls</span> <span class="n" style="color: #333;">new_ncls</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC204" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC205" 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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<pre style="margin: 0;"> <span id="LC206" 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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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="224" 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="229" 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">@@ -224,17 +229,22 @@ unify tms eq@(e1, e2) = case eq of</td>

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<pre style="margin: 0;"> <span id="LC229" 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;">boring</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC230" 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;">boring</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC231" class="line" lang="haskell"></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;">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>

</pre>

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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;">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 class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">case</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">decEqPmAltCon</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">c1</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">c2</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">of</span></span></span>

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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- See Note [Undecidable Equality for Overloaded Literals]</span></span>

</pre>

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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;">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>

</pre>

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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="n" style="color: #333;">unsat</span></span>

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<pre style="margin: 0;">+<span id="LC234" class="line" lang="haskell">    <span class="kt" style="color: #458; font-weight: 600;">Just</span> <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;">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>

</pre>

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<pre style="margin: 0;">+<span id="LC235" class="line" lang="haskell">    <span class="kt" style="color: #458; font-weight: 600;">Just</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;">unsat</span></span>

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<pre style="margin: 0;">+<span id="LC236" 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;">boring</span></span>

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<pre style="margin: 0;"> <span id="LC237" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC238" 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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<td class="diff-line-num new_line" data-linenumber="239" 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="LC239" 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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<td class="diff-line-num new_line" data-linenumber="240" 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="LC240" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC235" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- It's important to handle both rigid cases <span class="idiff left right">first, otherwise we get cyclic</span></span></span>

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<pre style="margin: 0;">-<span id="LC236" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- substitutions. Cf. 'extendSubstAndSolve' and</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- It's important to handle both rigid cases <span class="idiff left right">before the flexible ones,</span></span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="242" 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="LC242" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">otherwise we get cyclic </span>substitutions. Cf. 'extendSubstAndSolve' and</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC243" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- @testsuite/tests/pmcheck/should_compile/CyclicSubst.hs@.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC244" 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="LC245" class="line" lang="haskell">    <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isRefutable</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e2</span> <span class="p">(</span><span class="n" style="color: #333;">tm_neg</span> <span class="n" style="color: #333;">tms</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unsat</span></span>

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<pre style="margin: 0;">+<span id="LC246" 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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<pre style="margin: 0;">+<span id="LC247" class="line" lang="haskell">    <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isRefutable</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">e1</span> <span class="p">(</span><span class="n" style="color: #333;">tm_neg</span> <span class="n" style="color: #333;">tms</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unsat</span></span>

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<pre style="margin: 0;"> <span id="LC248" 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="LC249" 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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<pre style="margin: 0;"> <span id="LC250" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -278,7 +288,12 @@ trySolve x e _tms@TmS{ tm_pos = pos, tm_neg = neg }</td>

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<pre style="margin: 0;"> <span id="LC288" 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="LC289" 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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<pre style="margin: 0;"> <span id="LC290" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>

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<pre style="margin: 0;">-<span id="LC281" 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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<pre style="margin: 0;">+<span id="LC291" 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;">adjustDNameEnv</span> <span class="n" style="color: #333;">del_incompat</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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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC293" class="line" lang="haskell">    <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">alt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">e</span> <span class="c1" style="color: #998; font-style: italic;">-- always succeeds, bc @e@ is a solution</span></span>

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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell">    <span class="n" style="color: #333;">del_incompat</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">nlits</span><span class="p">,</span> <span class="n" style="color: #333;">ncls</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;">alt</span> <span class="kr" style="font-weight: 600;">of</span></span>

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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <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;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">nlits</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>

</pre>

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296

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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <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;">ty</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">ncls</span><span class="p">)</span></span>

</pre>

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282

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297

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<pre style="margin: 0;"> <span id="LC297" class="line" lang="haskell"></span>

</pre>

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283

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298

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<pre style="margin: 0;"> <span id="LC298" class="line" lang="haskell"><span class="cd">-- | When we know that a variable is fresh, we do not actually have to</span></span>

</pre>

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284

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299

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<pre style="margin: 0;"> <span id="LC299" 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>

</pre>

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