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<h3>
Simon Jakobi pushed to branch wip/sjakobi/nondetfolds
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/5a8fc5428d0bed111bd9d9d6f8219dde036c8ebf">5a8fc542</a></strong>
<div>
<span>by Simon Jakobi</span>
<i>at 2020-04-02T13:50:35+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More comments
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3e0f14115156921c5bb21e239542e0ad6646e701">3e0f1411</a></strong>
<div>
<span>by Simon Jakobi</span>
<i>at 2020-04-02T13:57:17+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add references to Note [Deterministic UniqFM]
</pre>
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<h4>7 changed files:</h4>
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<a href="#3aba9ceb20d68f25343fe3a27b2b7a4f8fea68da">
compiler/GHC/CmmToAsm/Reg/Graph/SpillClean.hs
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<li class="file-stats">
<a href="#dd1734ed93e4694f773dd468a1855524e6bbca0f">
compiler/GHC/Types/Unique/DSet.hs
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<a href="#07e36027465263e8b90313979f12e1f4a9ce64a5">
compiler/GHC/Types/Var/Env.hs
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<a href="#8fa3c53ff1558af938c045405b5e177c50e91308">
compiler/GHC/Types/Var/Set.hs
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<a href="#89165943f253c43100bca06548eba40ff0519ca5">
compiler/typecheck/TcEvidence.hs
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<a href="#75d517f701402b106e4d98d255eb24b57ba72aab">
compiler/typecheck/TcSimplify.hs
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<a href="#fadb1ee8bcf9d6112f1216f52f995b0298a593b2">
compiler/utils/GraphOps.hs
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<h4>Changes:</h4>
<li id="3aba9ceb20d68f25343fe3a27b2b7a4f8fea68da">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ebbd82602573a3313119b079e56ede716d93bab3...3e0f14115156921c5bb21e239542e0ad6646e701#3aba9ceb20d68f25343fe3a27b2b7a4f8fea68da"><strong>compiler/GHC/CmmToAsm/Reg/Graph/SpillClean.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="555" 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">@@ -555,7 +555,8 @@ delAssoc a m</td>
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<pre style="margin: 0;"> <span id="LC555" 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;">aSet</span>     <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupUFM</span>  <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC556" class="line" lang="haskell">        <span class="p">,</span> <span class="n" style="color: #333;">m1</span>            <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">delFromUFM</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC557" class="line" lang="haskell">        <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetStrictFoldUniqSet</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">delAssoc1</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="n" style="color: #333;">m1</span> <span class="n" style="color: #333;">aSet</span></span>
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<pre style="margin: 0;">-<span id="LC558" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use nonDetStrictFoldUFM here because deletion is commutative</span></span>
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<pre style="margin: 0;">+<span id="LC558" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use a non-deterministic fold here because deletion is</span></span>
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- commutative</span></span>
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<pre style="margin: 0;"> <span id="LC560" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC561" 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;">m</span></span>
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<pre style="margin: 0;"> <span id="LC562" class="line" lang="haskell"></span>
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<li id="dd1734ed93e4694f773dd468a1855524e6bbca0f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ebbd82602573a3313119b079e56ede716d93bab3...3e0f14115156921c5bb21e239542e0ad6646e701#dd1734ed93e4694f773dd468a1855524e6bbca0f"><strong>compiler/GHC/Types/Unique/DSet.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="98" 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="98" 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">@@ -98,6 +98,9 @@ uniqDSetIntersectUniqSet :: UniqDSet a -> UniqSet b -> UniqDSet a</td>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"><span class="n" style="color: #333;">uniqDSetIntersectUniqSet</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">ys</span></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UniqDSet</span> <span class="p">(</span><span class="n" style="color: #333;">udfmIntersectUFM</span> <span class="p">(</span><span class="n" style="color: #333;">getUniqDSet</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">getUniqSet</span> <span class="n" style="color: #333;">ys</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"></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;">-- See Note [Deterministic UniqFM] to learn about nondeterminism.</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;">-- If you use this please provide a justification why it doesn't introduce</span></span>
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<td class="diff-line-num new old_line" data-linenumber="101" 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="LC103" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- nondeterminism.</span></span>
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101
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104
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="haskell"><span class="n" style="color: #333;">nonDetStrictFoldUniqDSet</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="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="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UniqDSet</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>
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102
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105
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"><span class="n" style="color: #333;">nonDetStrictFoldUniqDSet</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">acc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UniqDSet</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetStrictFoldUDFM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">acc</span> <span class="n" style="color: #333;">s</span></span>
</pre>
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106
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"></span>
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<li id="07e36027465263e8b90313979f12e1f4a9ce64a5">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ebbd82602573a3313119b079e56ede716d93bab3...3e0f14115156921c5bb21e239542e0ad6646e701#07e36027465263e8b90313979f12e1f4a9ce64a5"><strong>compiler/GHC/Types/Var/Env.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">@@ -583,6 +583,9 @@ lookupDVarEnv = lookupUDFM</td>
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="haskell"><span class="n" style="color: #333;">foldDVarEnv</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="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="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DVarEnv</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>
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell"><span class="n" style="color: #333;">foldDVarEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldUDFM</span></span>
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<pre style="margin: 0;"> <span id="LC585" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Deterministic UniqFM] to learn about nondeterminism.</span></span>
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<pre style="margin: 0;">+<span id="LC587" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If you use this please provide a justification why it doesn't introduce</span></span>
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<pre style="margin: 0;">+<span id="LC588" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- nondeterminism.</span></span>
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<pre style="margin: 0;"> <span id="LC589" class="line" lang="haskell"><span class="n" style="color: #333;">nonDetStrictFoldDVarEnv</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="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="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DVarEnv</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>
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<pre style="margin: 0;"> <span id="LC590" class="line" lang="haskell"><span class="n" style="color: #333;">nonDetStrictFoldDVarEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetStrictFoldUDFM</span></span>
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<pre style="margin: 0;"> <span id="LC591" class="line" lang="haskell"></span>
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<li id="8fa3c53ff1558af938c045405b5e177c50e91308">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ebbd82602573a3313119b079e56ede716d93bab3...3e0f14115156921c5bb21e239542e0ad6646e701#8fa3c53ff1558af938c045405b5e177c50e91308"><strong>compiler/GHC/Types/Var/Set.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">@@ -154,6 +154,9 @@ allVarSet = uniqSetAll</td>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"><span class="n" style="color: #333;">mapVarSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Uniquable</span> <span class="n" style="color: #333;">b</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;">UniqSet</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;">UniqSet</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;">mapVarSet</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapUniqSet</span></span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Deterministic UniqFM] to learn about nondeterminism.</span></span>
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If you use this please provide a justification why it doesn't introduce</span></span>
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- nondeterminism.</span></span>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"><span class="n" style="color: #333;">nonDetStrictFoldVarSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"><span class="n" style="color: #333;">nonDetStrictFoldVarSet</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetStrictFoldUniqSet</span></span>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="haskell"><span class="n" style="color: #333;">dVarSetMinusVarSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DVarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DVarSet</span></span>
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<pre style="margin: 0;"> <span id="LC296" class="line" lang="haskell"><span class="n" style="color: #333;">dVarSetMinusVarSet</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uniqDSetMinusUniqSet</span></span>
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Deterministic UniqFM] to learn about nondeterminism.</span></span>
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If you use this please provide a justification why it doesn't introduce</span></span>
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- nondeterminism.</span></span>
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<pre style="margin: 0;"> <span id="LC301" class="line" lang="haskell"><span class="n" style="color: #333;">nonDetStrictFoldDVarSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DVarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC302" class="line" lang="haskell"><span class="n" style="color: #333;">nonDetStrictFoldDVarSet</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetStrictFoldUniqDSet</span></span>
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<pre style="margin: 0;"> <span id="LC303" class="line" lang="haskell"></span>
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<li id="89165943f253c43100bca06548eba40ff0519ca5">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ebbd82602573a3313119b079e56ede716d93bab3...3e0f14115156921c5bb21e239542e0ad6646e701#89165943f253c43100bca06548eba40ff0519ca5"><strong>compiler/typecheck/TcEvidence.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="501" 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">@@ -501,6 +501,9 @@ evBindMapBinds = foldEvBindMap consBag emptyBag</td>
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<pre style="margin: 0;"> <span id="LC501" class="line" lang="haskell"><span class="n" style="color: #333;">foldEvBindMap</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvBind</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EvBindMap</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"><span class="n" style="color: #333;">foldEvBindMap</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">bs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldDVarEnv</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">z</span> <span class="p">(</span><span class="n" style="color: #333;">ev_bind_varenv</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC503" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="504" 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="LC504" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Deterministic UniqFM] to learn about nondeterminism.</span></span>
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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If you use this please provide a justification why it doesn't introduce</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="504" 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="LC506" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- nondeterminism.</span></span>
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504
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507
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<pre style="margin: 0;"> <span id="LC507" class="line" lang="haskell"><span class="n" style="color: #333;">nonDetStrictFoldEvBindMap</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvBind</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EvBindMap</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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508
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"><span class="n" style="color: #333;">nonDetStrictFoldEvBindMap</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">bs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetStrictFoldDVarEnv</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">z</span> <span class="p">(</span><span class="n" style="color: #333;">ev_bind_varenv</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span></span>
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509
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<pre style="margin: 0;"> <span id="LC509" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="863" 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="866" 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">@@ -863,7 +866,7 @@ findNeededEvVars ev_binds seeds</td>
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866
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num old_line" data-linenumber="864" 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">
864
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867
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell">   <span class="n" style="color: #333;">also_needs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
</pre>
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865
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868
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell">   <span class="n" style="color: #333;">also_needs</span> <span class="n" style="color: #333;">needs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetStrictFoldUniqSet</span> <span class="n" style="color: #333;">add</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="n" style="color: #333;">needs</span></span>
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866
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<td class="diff-line-num new_line old" data-linenumber="869" 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="LC866" class="line" lang="haskell">     <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use <span class="idiff left right">nonDetStrictFoldUFM</span> here because we immediately</span></span>
</pre>
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869
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<pre style="margin: 0;">+<span id="LC869" class="line" lang="haskell">     <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use <span class="idiff left right">a non-deterministic fold</span> here because we immediately</span></span>
</pre>
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867
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870
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell">     <span class="c1" style="color: #998; font-style: italic;">-- forget about the ordering by creating a set</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="869" 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="872" 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="LC872" class="line" lang="haskell">   <span class="n" style="color: #333;">add</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
</pre>
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<li id="75d517f701402b106e4d98d255eb24b57ba72aab">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ebbd82602573a3313119b079e56ede716d93bab3...3e0f14115156921c5bb21e239542e0ad6646e701#75d517f701402b106e4d98d255eb24b57ba72aab"><strong>compiler/typecheck/TcSimplify.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1863" 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="1863" 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">@@ -1863,6 +1863,8 @@ neededEvVars implic@(Implic { ic_given = givens</td>
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<pre style="margin: 0;"> <span id="LC1863" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;"> <span id="LC1864" class="line" lang="haskell">      <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">seeds1</span>        <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add_implic_seeds</span> <span class="n" style="color: #333;">old_needs</span> <span class="n" style="color: #333;">implics</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC1865" class="line" lang="haskell">            <span class="n" style="color: #333;">seeds2</span>        <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetStrictFoldEvBindMap</span> <span class="n" style="color: #333;">add_wanted</span> <span class="n" style="color: #333;">seeds1</span> <span class="n" style="color: #333;">ev_binds</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1866" 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="LC1866" class="line" lang="haskell">                            <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use a non-deterministic fold here</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1866" 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="LC1867" class="line" lang="haskell">                            <span class="c1" style="color: #998; font-style: italic;">-- because add_wanted is commutative</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC1868" class="line" lang="haskell">            <span class="n" style="color: #333;">seeds3</span>        <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">seeds2</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tcvs</span></span>
</pre>
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<td class="diff-line-num new_line" data-linenumber="1869" 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="LC1869" class="line" lang="haskell">            <span class="n" style="color: #333;">need_inner</span>    <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findNeededEvVars</span> <span class="n" style="color: #333;">ev_binds</span> <span class="n" style="color: #333;">seeds3</span></span>
</pre>
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<td class="diff-line-num new_line" data-linenumber="1870" 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="LC1870" class="line" lang="haskell">            <span class="n" style="color: #333;">live_ev_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterEvBindMap</span> <span class="p">(</span><span class="n" style="color: #333;">needed_ev_bind</span> <span class="n" style="color: #333;">need_inner</span><span class="p">)</span> <span class="n" style="color: #333;">ev_binds</span></span>
</pre>
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<li id="fadb1ee8bcf9d6112f1216f52f995b0298a593b2">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ebbd82602573a3313119b079e56ede716d93bab3...3e0f14115156921c5bb21e239542e0ad6646e701#fadb1ee8bcf9d6112f1216f52f995b0298a593b2"><strong>compiler/utils/GraphOps.hs</strong></a>
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<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">@@ -64,7 +64,7 @@ addNode k node graph</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;">-- add back conflict edges from other nodes to this one</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell">        <span class="n" style="color: #333;">map_conflict</span> <span class="o" style="font-weight: 600;">=</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="66" 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="LC66" class="line" lang="haskell">          <span class="n" style="color: #333;">nonDetStrictFoldUniqSet</span></span>
</pre>
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<td class="diff-line-num new_line old" data-linenumber="67" 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="LC67" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use <span class="idiff left right">nonDetStrictFoldUFM</span> here because the</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="67" 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="LC67" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use <span class="idiff left right">a non-deterministic fold</span> here because the</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- operation is commutative</span></span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell">            <span class="p">(</span><span class="n" style="color: #333;">adjustUFM_C</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">n</span> <span class="p">{</span> <span class="n" style="color: #333;">nodeConflicts</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell">                                      <span class="n" style="color: #333;">addOneToUniqSet</span> <span class="p">(</span><span class="n" style="color: #333;">nodeConflicts</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="n" style="color: #333;">k</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">@@ -74,7 +74,7 @@ addNode k node graph</td>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">-- add back coalesce edges from other nodes to this one</span></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell">        <span class="n" style="color: #333;">map_coalesce</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="haskell">          <span class="n" style="color: #333;">nonDetStrictFoldUniqSet</span></span>
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<pre style="margin: 0;">-<span id="LC77" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use <span class="idiff left right">nonDetStrictFoldUFM</span> here because the</span></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use <span class="idiff left right">a non-deterministic fold</span> here because the</span></span>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- operation is commutative</span></span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="haskell">            <span class="p">(</span><span class="n" style="color: #333;">adjustUFM_C</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">n</span> <span class="p">{</span> <span class="n" style="color: #333;">nodeCoalesce</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell">                                      <span class="n" style="color: #333;">addOneToUniqSet</span> <span class="p">(</span><span class="n" style="color: #333;">nodeCoalesce</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="n" style="color: #333;">k</span><span class="p">}))</span></span>
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<pre style="margin: 0;"> <span id="LC477" class="line" lang="haskell">                                <span class="c1" style="color: #998; font-style: italic;">-- If the edge isn't actually in the coelesce set then just ignore it.</span></span>
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<pre style="margin: 0;"> <span id="LC478" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC479" class="line" lang="haskell">        <span class="n" style="color: #333;">fm2</span>     <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetStrictFoldUniqSet</span> <span class="p">(</span><span class="n" style="color: #333;">adjustUFM_C</span> <span class="p">(</span><span class="n" style="color: #333;">freezeEdge</span> <span class="n" style="color: #333;">k</span><span class="p">))</span> <span class="n" style="color: #333;">fm1</span></span>
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<pre style="margin: 0;">-<span id="LC480" class="line" lang="haskell">                    <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use <span class="idiff left right">nonDetStrictFoldUFM here because the operation</span></span></span>
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<pre style="margin: 0;">-<span id="LC481" class="line" lang="haskell">                    <span class="c1" style="color: #998; font-style: italic;">-- is commutative</span></span>
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<pre style="margin: 0;">+<span id="LC480" class="line" lang="haskell">                    <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use <span class="idiff left right">a non-deterministic fold here because the</span></span></span>
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<pre style="margin: 0;">+<span id="LC481" class="line" lang="haskell">                    <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">operation </span>is commutative</span></span>
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<pre style="margin: 0;"> <span id="LC482" class="line" lang="haskell">                        <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">nodeCoalesce</span> <span class="n" style="color: #333;">node</span></span>
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<pre style="margin: 0;"> <span id="LC483" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC484" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">in</span>  <span class="n" style="color: #333;">fm2</span></span>
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