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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eaed0a3289e4c24ff1a70c6fc4b7f8bae6cd2dd3">eaed0a32</a></strong>
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<span>by Alexis King</span>
<i>at 2020-04-19T03:16:44-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add missing addInScope call for letrec binders in OccurAnal
This fixes #18044, where a shadowed variable was incorrectly substituted
by the binder swap on the RHS of a floated-in letrec. This can only
happen when the uniques line up *just* right, so writing a regression
test would be very difficult, but at least the fix is small and
straightforward.
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<h4>1 changed file:</h4>
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<a href="#bac3d5159a5688007de3aa3f5c4e50569677b347">
compiler/GHC/Core/Opt/OccurAnal.hs
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<h4>Changes:</h4>
<li id="bac3d5159a5688007de3aa3f5c4e50569677b347">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eaed0a3289e4c24ff1a70c6fc4b7f8bae6cd2dd3#bac3d5159a5688007de3aa3f5c4e50569677b347"><strong>compiler/GHC/Core/Opt/OccurAnal.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">@@ -843,7 +843,7 @@ occAnalNonRecBind env lvl imp_rule_edges bndr rhs body_usage</td>
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRecBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)]</span></span>
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844
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreBind</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRecBind</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">pairs</span> <span class="n" style="color: #333;">body_usage</span></span>
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<pre style="margin: 0;">-<span id="LC846" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">occAnalRec</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">lvl</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">body_usage</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;">sccs</span></span>
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">occAnalRec</span> <span class="n" style="color: #333;"><span class="idiff left right">rhs_</span>env</span> <span class="n" style="color: #333;">lvl</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">body_usage</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;">sccs</span></span>
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For a recursive group, we</span></span>
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * occ-analyse all the RHSs</span></span>
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * compute strongly-connected components</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">@@ -856,9 +856,11 @@ occAnalRecBind env lvl imp_rule_edges pairs body_usage</td>
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"> <span class="n" style="color: #333;">nodes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"> <span class="n" style="color: #333;">nodes</span> <span class="o" style="font-weight: 600;">=</span> <span class="cp" style="color: #999; font-weight: 600;">{-# SCC "occAnalBind.assoc" #-}</span></span>
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<pre style="margin: 0;">-<span id="LC859" class="line" lang="haskell"> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">makeNode</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr_set</span><span class="p">)</span> <span class="n" style="color: #333;">pairs</span></span>
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">makeNode</span> <span class="n" style="color: #333;"><span class="idiff left right">rhs_</span>env</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr_set</span><span class="p">)</span> <span class="n" style="color: #333;">pairs</span></span>
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC861" class="line" lang="haskell"> <span class="n" style="color: #333;">bndr_set</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">pairs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC861" class="line" lang="haskell"> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">pairs</span></span>
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"> <span class="n" style="color: #333;">bndr_set</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">`</span><span class="n" style="color: #333;">addInScope</span><span class="p">`</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Unfoldings and join points]</span></span>
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