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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>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b316804dbafe1d0287fd33f656b7ce5711ec34f7">b316804d</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-07-01T15:42:49-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve debug tracing for substitution
This patch improves debug tracing a bit (#18395)
* Remove the ancient SDoc argument to substitution, replacing it
with a HasDebugCallStack constraint. The latter does the same
job (indicate the call site) but much better.
* Add HasDebugCallStack to simpleOptExpr, exprIsConApp_maybe
I needed this to help nail the lookupIdSubst panic in
#18326, #17784
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<h4>8 changed files:</h4>
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<li class="file-stats">
<a href="#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
compiler/GHC/Core/Opt/Arity.hs
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<li class="file-stats">
<a href="#446b4afbe6836b950115a619acea24ddde19dc90">
compiler/GHC/Core/Opt/CSE.hs
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<li class="file-stats">
<a href="#48fbb5cdea308650de5756521feb28ec68819b9b">
compiler/GHC/Core/Opt/Simplify/Utils.hs
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<li class="file-stats">
<a href="#b6a5ba32bafb8fbda933538b3007e755fef6f101">
compiler/GHC/Core/Opt/SpecConstr.hs
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<li class="file-stats">
<a href="#ab22d7ae4d245581b701367e386d7e886e416e76">
compiler/GHC/Core/Opt/Specialise.hs
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<li class="file-stats">
<a href="#d01de95d8c71d4dec6a9a59146186e29a5b3fd38">
compiler/GHC/Core/Rules.hs
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<li class="file-stats">
<a href="#11ffe98a94d798427bc600e4fcfe899407536346">
compiler/GHC/Core/SimpleOpt.hs
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<li class="file-stats">
<a href="#708fab0a51bd47227233eda4698e750ff6de66e0">
compiler/GHC/Core/Subst.hs
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<h4>Changes:</h4>
<li id="c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b316804dbafe1d0287fd33f656b7ce5711ec34f7#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999"><strong>compiler/GHC/Core/Opt/Arity.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1023" 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">@@ -1023,7 +1023,7 @@ etaInfoApp subst (Tick t e) eis</td>
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1023
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1023
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<pre style="margin: 0;"> <span id="LC1023" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="1024" 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">
1024
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<td class="diff-line-num new_line" data-linenumber="1024" 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">
1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"><span class="n" style="color: #333;">etaInfoApp</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">expr</span> <span class="kr" style="font-weight: 600;">_</span></span>
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1025
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun</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;">collectArgs</span> <span class="n" style="color: #333;">expr</span></span>
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1026
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<td class="diff-line-num new_line old" data-linenumber="1026" 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="LC1026" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"etaInfoApp"</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fun</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">fun</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1027" 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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1026
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<pre style="margin: 0;">+<span id="LC1026" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">fun</span></span>
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1027
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1027
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<pre style="margin: 0;"> <span id="LC1027" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">fun'</span></span>
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1028
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1028
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<pre style="margin: 0;"> <span id="LC1028" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">subst_expr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">expr</span></span>
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1029
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1029
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<pre style="margin: 0;"> <span id="LC1029" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1132" 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">@@ -1132,13 +1132,16 @@ mkEtaWW orig_n ppr_orig_expr in_scope orig_ty</td>
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1132
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<pre style="margin: 0;"> <span id="LC1132" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1133" class="line" lang="haskell"></span>
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1134
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<pre style="margin: 0;"> <span id="LC1134" class="line" lang="haskell"></span>
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1135
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<pre style="margin: 0;">-<span id="LC1135" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------</span></span>
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1136
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<pre style="margin: 0;">-<span id="LC1136" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Don't use short-cutting substitution - we may be changing the types of join</span></span>
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1137
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<pre style="margin: 0;">-<span id="LC1137" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- points, so applying the in-scope set is necessary</span></span>
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1138
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<pre style="margin: 0;">-<span id="LC1138" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TODO Check if we actually *are* changing any join points' types</span></span>
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1139
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<pre style="margin: 0;">-<span id="LC1139" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1135" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------</span></span>
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1140
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<pre style="margin: 0;"> <span id="LC1136" class="line" lang="haskell"><span class="n" style="color: #333;">subst_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">-<span id="LC1141" class="line" lang="haskell"><span class="n" style="color: #333;">subst_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substExpr</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"GHC.Core.Opt.Arity:substExpr"</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1137" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Apply a substitution to an expression. We use substExpr</span></span>
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<pre style="margin: 0;">+<span id="LC1138" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- not substExprSC (short-cutting substitution) because</span></span>
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<pre style="margin: 0;">+<span id="LC1139" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we may be changing the types of join points, so applying</span></span>
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<pre style="margin: 0;">+<span id="LC1140" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the in-scope set is necessary.</span></span>
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<pre style="margin: 0;">+<span id="LC1141" 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="LC1142" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ToDo: we could instead check if we actually *are*</span></span>
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<pre style="margin: 0;">+<span id="LC1143" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- changing any join points' types, and if not use substExprSC.</span></span>
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<pre style="margin: 0;">+<span id="LC1144" class="line" lang="haskell"><span class="n" style="color: #333;">subst_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substExpr</span></span>
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<pre style="margin: 0;"> <span id="LC1145" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1146" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1147" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b316804dbafe1d0287fd33f656b7ce5711ec34f7#446b4afbe6836b950115a619acea24ddde19dc90"><strong>compiler/GHC/Core/Opt/CSE.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">@@ -775,7 +775,7 @@ csEnvSubst :: CSEnv -> Subst</td>
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<pre style="margin: 0;"> <span id="LC775" class="line" lang="haskell"><span class="n" style="color: #333;">csEnvSubst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cs_subst</span></span>
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<pre style="margin: 0;"> <span id="LC776" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC777" class="line" lang="haskell"><span class="n" style="color: #333;">lookupSubst</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CSEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutExpr</span></span>
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<pre style="margin: 0;">-<span id="LC778" class="line" lang="haskell"><span class="n" style="color: #333;">lookupSubst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CS</span> <span class="p">{</span> <span class="n" style="color: #333;">cs_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sub</span><span class="p">})</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"CSE.lookupSubst"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">sub</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"><span class="n" style="color: #333;">lookupSubst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CS</span> <span class="p">{</span> <span class="n" style="color: #333;">cs_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sub</span><span class="p">})</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="n" style="color: #333;">sub</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC780" class="line" lang="haskell"><span class="n" style="color: #333;">extendCSSubst</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CSEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CSEnv</span></span>
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="haskell"><span class="n" style="color: #333;">extendCSSubst</span> <span class="n" style="color: #333;">cse</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cse</span> <span class="p">{</span> <span class="n" style="color: #333;">cs_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendSubst</span> <span class="p">(</span><span class="n" style="color: #333;">cs_subst</span> <span class="n" style="color: #333;">cse</span><span class="p">)</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">rhs</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b316804dbafe1d0287fd33f656b7ce5711ec34f7#48fbb5cdea308650de5756521feb28ec68819b9b"><strong>compiler/GHC/Core/Opt/Simplify/Utils.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">@@ -1804,7 +1804,7 @@ abstractFloats dflags top_lvl main_tvs floats body</td>
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<pre style="margin: 0;"> <span id="LC1804" 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;">notNull</span> <span class="n" style="color: #333;">body_floats</span> <span class="p">)</span></span>
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1805
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<pre style="margin: 0;"> <span id="LC1805" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">isNilOL</span> <span class="p">(</span><span class="n" style="color: #333;">sfJoinFloats</span> <span class="n" style="color: #333;">floats</span><span class="p">)</span> <span class="p">)</span></span>
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1806
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1806
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<pre style="margin: 0;"> <span id="LC1806" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">float_binds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapAccumLM</span> <span class="n" style="color: #333;">abstract</span> <span class="n" style="color: #333;">empty_subst</span> <span class="n" style="color: #333;">body_floats</span></span>
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1807
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<pre style="margin: 0;">-<span id="LC1807" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">float_binds</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Subst</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substExpr</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"abstract_floats1"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1807" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">float_binds</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Subst</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1808" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1809
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<pre style="margin: 0;"> <span id="LC1809" class="line" lang="haskell"> <span class="n" style="color: #333;">is_top_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTopLevel</span> <span class="n" style="color: #333;">top_lvl</span></span>
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1810
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<pre style="margin: 0;"> <span id="LC1810" class="line" lang="haskell"> <span class="n" style="color: #333;">main_tv_set</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">main_tvs</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">@@ -1818,7 +1818,7 @@ abstractFloats dflags top_lvl main_tvs floats body</td>
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1818
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<pre style="margin: 0;"> <span id="LC1818" class="line" lang="haskell"> <span class="n" style="color: #333;">subst'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Subst</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">extendIdSubst</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">poly_app</span></span>
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<pre style="margin: 0;"> <span id="LC1819" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">poly_id2</span> <span class="n" style="color: #333;">poly_rhs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1820" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1821
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<pre style="margin: 0;">-<span id="LC1821" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Subst</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substExpr</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"abstract_floats2"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC1821" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Subst</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">rhs</span></span>
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1822
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<pre style="margin: 0;"> <span id="LC1822" class="line" lang="haskell"></span>
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1823
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<pre style="margin: 0;"> <span id="LC1823" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tvs_here: see Note [Which type variables to abstract over]</span></span>
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1824
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<pre style="margin: 0;"> <span id="LC1824" class="line" lang="haskell"> <span class="n" style="color: #333;">tvs_here</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">scopedSort</span> <span class="o" style="font-weight: 600;">$</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">@@ -1831,8 +1831,7 @@ abstractFloats dflags top_lvl main_tvs floats body</td>
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<pre style="margin: 0;"> <span id="LC1831" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">subst'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Subst</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">extendSubstList</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">ids</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">poly_apps</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1832" class="line" lang="haskell"> <span class="n" style="color: #333;">poly_pairs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="n" style="color: #333;">mk_poly2</span> <span class="n" style="color: #333;">poly_id</span> <span class="n" style="color: #333;">tvs_here</span> <span class="n" style="color: #333;">rhs'</span></span>
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<pre style="margin: 0;"> <span id="LC1833" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">poly_id</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">poly_ids</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">rhss</span></span>
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<pre style="margin: 0;">-<span id="LC1834" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Subst</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substExpr</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"abstract_floats"</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1835" class="line" lang="haskell"> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">rhs</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1834" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Subst</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">rhs</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC1835" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="n" style="color: #333;">poly_pairs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1836" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1837" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ids</span><span class="p">,</span><span class="n" style="color: #333;">rhss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unzip</span> <span class="n" style="color: #333;">prs</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b316804dbafe1d0287fd33f656b7ce5711ec34f7#b6a5ba32bafb8fbda933538b3007e755fef6f101"><strong>compiler/GHC/Core/Opt/SpecConstr.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">@@ -860,7 +860,7 @@ lookupHowBound :: ScEnv -> Id -> Maybe HowBound</td>
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"><span class="n" style="color: #333;">lookupHowBound</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">sc_how_bound</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="haskell"><span class="n" style="color: #333;">scSubstId</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ScEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">-<span id="LC863" class="line" lang="haskell"><span class="n" style="color: #333;">scSubstId</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"scSubstId"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">(</span></span><span class="n" style="color: #333;">sc_subst</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"><span class="n" style="color: #333;">scSubstId</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="p">(</span><span class="n" style="color: #333;">sc_subst</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">v</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="n" style="color: #333;">scSubstTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ScEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"><span class="n" style="color: #333;">scSubstTy</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTy</span> <span class="p">(</span><span class="n" style="color: #333;">sc_subst</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b316804dbafe1d0287fd33f656b7ce5711ec34f7#ab22d7ae4d245581b701367e386d7e886e416e76"><strong>compiler/GHC/Core/Opt/Specialise.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">@@ -1008,7 +1008,7 @@ instance Outputable SpecEnv where</td>
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<pre style="margin: 0;"> <span id="LC1008" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"interesting ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">interesting</span> <span class="p">])</span></span>
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1009
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<pre style="margin: 0;"> <span id="LC1009" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1010" class="line" lang="haskell"><span class="n" style="color: #333;">specVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SpecEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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1011
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<pre style="margin: 0;">-<span id="LC1011" class="line" lang="haskell"><span class="n" style="color: #333;">specVar</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">lookupIdSubst</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"specVar"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">(</span></span><span class="n" style="color: #333;">se_subst</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">+<span id="LC1011" class="line" lang="haskell"><span class="n" style="color: #333;">specVar</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">lookupIdSubst</span> <span class="p">(</span><span class="n" style="color: #333;">se_subst</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC1012" class="line" lang="haskell"></span>
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1013
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<pre style="margin: 0;"> <span id="LC1013" class="line" lang="haskell"><span class="n" style="color: #333;">specExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SpecEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">)</span></span>
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1014
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<pre style="margin: 0;"> <span id="LC1014" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b316804dbafe1d0287fd33f656b7ce5711ec34f7#d01de95d8c71d4dec6a9a59146186e29a5b3fd38"><strong>compiler/GHC/Core/Rules.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="917" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -917,7 +917,7 @@ match_var renv@(RV { rv_tmpls = tmpls, rv_lcl = rn_env, rv_fltR = flt_env })</td>
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917
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v2</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">v1'</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">rnOccR</span> <span class="n" style="color: #333;">rn_env</span> <span class="n" style="color: #333;">v2</span></span>
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918
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<pre style="margin: 0;"> <span id="LC918" 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;">subst</span></span>
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<pre style="margin: 0;"> <span id="LC919" class="line" lang="haskell"></span>
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920
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<pre style="margin: 0;">-<span id="LC920" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"match_var"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">flt_env</span> <span class="n" style="color: #333;">v2</span></span>
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<pre style="margin: 0;">+<span id="LC920" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="n" style="color: #333;">flt_env</span> <span class="n" style="color: #333;">v2</span></span>
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<pre style="margin: 0;"> <span id="LC921" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">v1'</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">v2'</span></span>
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922
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<pre style="margin: 0;"> <span id="LC922" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">subst</span></span>
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923
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<pre style="margin: 0;"> <span id="LC923" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -965,7 +965,7 @@ match_tmpl_var renv@(RV { rv_lcl = rn_env, rv_fltR = flt_env })</td>
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<pre style="margin: 0;"> <span id="LC965" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC966" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e2' is the result of applying flt_env to e2</span></span>
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<pre style="margin: 0;"> <span id="LC967" class="line" lang="haskell"> <span class="n" style="color: #333;">e2'</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyVarSet</span> <span class="n" style="color: #333;">let_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">e2</span></span>
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968
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<pre style="margin: 0;">-<span id="LC968" 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;">substExpr</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"match_tmpl_var"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">flt_env</span> <span class="n" style="color: #333;">e2</span></span>
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<pre style="margin: 0;">+<span id="LC968" 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;">substExpr</span> <span class="n" style="color: #333;">flt_env</span> <span class="n" style="color: #333;">e2</span></span>
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969
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<pre style="margin: 0;"> <span id="LC969" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC970" class="line" lang="haskell"> <span class="n" style="color: #333;">id_subst'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">rs_id_subst</span> <span class="n" style="color: #333;">subst</span><span class="p">)</span> <span class="n" style="color: #333;">v1'</span> <span class="n" style="color: #333;">e2'</span></span>
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<pre style="margin: 0;"> <span id="LC971" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- No further renaming to do on e2',</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b316804dbafe1d0287fd33f656b7ce5711ec34f7#11ffe98a94d798427bc600e4fcfe899407536346"><strong>compiler/GHC/Core/SimpleOpt.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">@@ -93,7 +93,7 @@ little dance in action; the full Simplifier is a lot more complicated.</td>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC96" class="line" lang="haskell"><span class="n" style="color: #333;">simpleOptExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"><span class="n" style="color: #333;">simpleOptExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">HasDebugCallStack</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [The simple optimiser]</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;">-- Do simple optimisation on an expression</span></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The optimisation is very straightforward: just</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">@@ -125,7 +125,7 @@ simpleOptExpr dflags expr</td>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's a bit painful to call exprFreeVars, because it makes</span></span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- three passes instead of two (occ-anal, and go)</span></span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC128" class="line" lang="haskell"><span class="n" style="color: #333;">simpleOptExprWith</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutExpr</span></span>
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"><span class="n" style="color: #333;">simpleOptExprWith</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">HasDebugCallStack</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutExpr</span></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [The simple optimiser]</span></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"><span class="n" style="color: #333;">simpleOptExprWith</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simple_opt_expr</span> <span class="n" style="color: #333;">init_env</span> <span class="p">(</span><span class="n" style="color: #333;">occurAnalyseExpr</span> <span class="n" style="color: #333;">expr</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">@@ -218,7 +218,7 @@ simple_opt_expr env expr</td>
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">clo</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">soe_inl</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simple_opt_clo</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">clo</span></span>
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<pre style="margin: 0;"> <span id="LC220" 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="LC221" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"simpleOptExpr"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">(</span></span><span class="n" style="color: #333;">soe_subst</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="p">(</span><span class="n" style="color: #333;">soe_subst</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simple_app</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e1</span> <span class="p">[(</span><span class="n" style="color: #333;">env</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="LC224" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="p">(</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -293,7 +293,7 @@ mk_cast e co | isReflexiveCo co = e</td>
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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC294" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------------</span></span>
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- simple_app collects arguments for beta reduction</span></span>
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<pre style="margin: 0;">-<span id="LC296" class="line" lang="haskell"><span class="n" style="color: #333;">simple_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SimpleOptEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SimpleClo</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"><span class="n" style="color: #333;">simple_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">HasDebugCallStack</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">SimpleOptEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SimpleClo</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</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="n" style="color: #333;">simple_app</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="n" style="color: #333;">as</span></span>
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<pre style="margin: 0;"> <span id="LC299" 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="n" style="color: #333;">env'</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;">lookupVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">soe_inl</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">v</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">@@ -306,7 +306,7 @@ simple_app env (Var v) as</td>
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306
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<pre style="margin: 0;"> <span id="LC306" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simple_app</span> <span class="p">(</span><span class="n" style="color: #333;">soeZapSubst</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">unfoldingTemplate</span> <span class="n" style="color: #333;">unf</span><span class="p">)</span> <span class="n" style="color: #333;">as</span></span>
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307
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<pre style="margin: 0;"> <span id="LC307" class="line" lang="haskell"></span>
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308
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<pre style="margin: 0;"> <span id="LC308" 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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309
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<pre style="margin: 0;">-<span id="LC309" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">out_fn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"simple_app"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">(</span></span><span class="n" style="color: #333;">soe_subst</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">out_fn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="p">(</span><span class="n" style="color: #333;">soe_subst</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">v</span></span>
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310
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<pre style="margin: 0;"> <span id="LC310" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">finish_app</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">out_fn</span> <span class="n" style="color: #333;">as</span></span>
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311
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<pre style="margin: 0;"> <span id="LC311" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC312" class="line" lang="haskell"><span class="n" style="color: #333;">simple_app</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="n" style="color: #333;">as</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">@@ -1064,7 +1064,8 @@ data ConCont = CC [CoreExpr] Coercion</td>
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1064
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<pre style="margin: 0;"> <span id="LC1064" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1065
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1065
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<pre style="margin: 0;"> <span id="LC1065" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We also return the incoming InScopeSet, augmented with</span></span>
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1066
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1066
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<pre style="margin: 0;"> <span id="LC1066" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the binders from any [FloatBind] that we return</span></span>
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1067
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<pre style="margin: 0;">-<span id="LC1067" class="line" lang="haskell"><span class="n" style="color: #333;">exprIsConApp_maybe</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InScopeEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC1067" class="line" lang="haskell"><span class="n" style="color: #333;">exprIsConApp_maybe</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HasDebugCallStack</span></span>
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<pre style="margin: 0;">+<span id="LC1068" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">InScopeEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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1068
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1069
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<pre style="margin: 0;"> <span id="LC1069" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InScopeSet</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">FloatBind</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span><span class="p">,</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;">CoreExpr</span><span class="p">])</span></span>
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1069
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1070
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<pre style="margin: 0;"> <span id="LC1070" class="line" lang="haskell"><span class="n" style="color: #333;">exprIsConApp_maybe</span> <span class="p">(</span><span class="n" style="color: #333;">in_scope</span><span class="p">,</span> <span class="n" style="color: #333;">id_unf</span><span class="p">)</span> <span class="n" style="color: #333;">expr</span></span>
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1070
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1071
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="n" style="color: #333;">in_scope</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CC</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">(</span><span class="n" style="color: #333;">mkRepReflCo</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">expr</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">@@ -1118,7 +1119,7 @@ exprIsConApp_maybe (in_scope, id_unf) expr</td>
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1118
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1119
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<pre style="margin: 0;"> <span id="LC1119" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">sub</span><span class="p">)</span> <span class="n" style="color: #333;">floats</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="n" style="color: #333;">cont</span></span>
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1119
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1120
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<pre style="margin: 0;"> <span id="LC1120" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="p">(</span><span class="n" style="color: #333;">substInScope</span> <span class="n" style="color: #333;">sub</span><span class="p">))</span></span>
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1120
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1121
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<pre style="margin: 0;"> <span id="LC1121" class="line" lang="haskell"> <span class="n" style="color: #333;">floats</span></span>
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1121
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<pre style="margin: 0;">-<span id="LC1121" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">lookupIdSubst</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"exprIsConApp"</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">expr</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">sub</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1122" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">lookupIdSubst</span> <span class="n" style="color: #333;">sub</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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1123
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<pre style="margin: 0;"> <span id="LC1123" class="line" lang="haskell"> <span class="n" style="color: #333;">cont</span></span>
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1124
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<pre style="margin: 0;"> <span id="LC1124" class="line" lang="haskell"></span>
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1125
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<pre style="margin: 0;"> <span id="LC1125" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="n" style="color: #333;">in_scope</span><span class="p">)</span> <span class="n" style="color: #333;">floats</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="n" style="color: #333;">cont</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CC</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1142" 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">@@ -1141,7 +1142,7 @@ exprIsConApp_maybe (in_scope, id_unf) expr</td>
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1141
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1142
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<pre style="margin: 0;"> <span id="LC1142" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">bndrs</span> <span class="p">`</span><span class="n" style="color: #333;">equalLength</span><span class="p">`</span> <span class="n" style="color: #333;">args</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [DFun arity check]</span></span>
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1143
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<pre style="margin: 0;"> <span id="LC1143" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkOpenSubst</span> <span class="n" style="color: #333;">in_scope</span> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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1143
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1144
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<pre style="margin: 0;"> <span id="LC1144" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">succeedWith</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">floats</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1144" class="line" lang="haskell"> <span class="n" style="color: #333;">pushCoDataCon</span> <span class="n" style="color: #333;">con</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">substExpr</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"exprIsConApp1"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst</span><span class="p">)</span> <span class="n" style="color: #333;">dfun_args</span><span class="p">)</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC1145" class="line" lang="haskell"> <span class="n" style="color: #333;">pushCoDataCon</span> <span class="n" style="color: #333;">con</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;">subst</span><span class="p">)</span> <span class="n" style="color: #333;">dfun_args</span><span class="p">)</span> <span class="n" style="color: #333;">co</span></span>
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1145
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<pre style="margin: 0;"> <span id="LC1146" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1147" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Look through unfoldings, but only arity-zero one;</span></span>
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1148
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<pre style="margin: 0;"> <span id="LC1148" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if arity > 0 we are effectively inlining a function call,</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1181" 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">@@ -1180,7 +1181,7 @@ exprIsConApp_maybe (in_scope, id_unf) expr</td>
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1180
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1181
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<pre style="margin: 0;"> <span id="LC1181" class="line" lang="haskell"> <span class="n" style="color: #333;">subst_co</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Subst</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substCo</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;"> <span id="LC1182" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1183" class="line" lang="haskell"> <span class="n" style="color: #333;">subst_expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="p">{})</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">e</span></span>
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1183
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<pre style="margin: 0;">-<span id="LC1183" class="line" lang="haskell"> <span class="n" style="color: #333;">subst_expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substExpr</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"exprIsConApp2"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC1184" class="line" lang="haskell"> <span class="n" style="color: #333;">subst_expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">e</span></span>
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1185
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<pre style="margin: 0;"> <span id="LC1185" class="line" lang="haskell"></span>
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1186
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<pre style="margin: 0;"> <span id="LC1186" class="line" lang="haskell"> <span class="n" style="color: #333;">subst_bndr</span> <span class="n" style="color: #333;">msubst</span> <span class="n" style="color: #333;">bndr</span></span>
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1187
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<pre style="margin: 0;"> <span id="LC1187" 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;">Right</span> <span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">bndr'</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">@@ -1461,7 +1462,7 @@ pushCoercionIntoLambda in_scope x e co</td>
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1462
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<pre style="margin: 0;"> <span id="LC1462" class="line" lang="haskell"> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendIdSubst</span> <span class="p">(</span><span class="n" style="color: #333;">mkEmptySubst</span> <span class="n" style="color: #333;">in_scope'</span><span class="p">)</span></span>
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1463
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<pre style="margin: 0;"> <span id="LC1463" class="line" lang="haskell"> <span class="n" style="color: #333;">x</span></span>
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1464
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<pre style="margin: 0;"> <span id="LC1464" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkCast</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">x'</span><span class="p">)</span> <span class="n" style="color: #333;">co1</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1464" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">x'</span><span class="p">,</span> <span class="n" style="color: #333;">substExpr</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"pushCoercionIntoLambda"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">e</span> <span class="p">`</span><span class="n" style="color: #333;">mkCast</span><span class="p">`</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1465" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">x'</span><span class="p">,</span> <span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">e</span> <span class="p">`</span><span class="n" style="color: #333;">mkCast</span><span class="p">`</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1466" 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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1467
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<pre style="margin: 0;"> <span id="LC1467" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprTrace</span> <span class="s" style="color: #d14;">"exprIsLambda_maybe: Unexpected lambda in case"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">))</span></span>
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1468
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<pre style="margin: 0;"> <span id="LC1468" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b316804dbafe1d0287fd33f656b7ce5711ec34f7#708fab0a51bd47227233eda4698e750ff6de66e0"><strong>compiler/GHC/Core/Subst.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">@@ -246,13 +246,13 @@ extendSubstList subst [] = subst</td>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="haskell"><span class="n" style="color: #333;">extendSubstList</span> <span class="n" style="color: #333;">subst</span> <span class="p">((</span><span class="n" style="color: #333;">var</span><span class="p">,</span><span class="n" style="color: #333;">rhs</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">prs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendSubstList</span> <span class="p">(</span><span class="n" style="color: #333;">extendSubst</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="n" style="color: #333;">prs</span></span>
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<pre style="margin: 0;"> <span id="LC247" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC248" class="line" lang="haskell"><span class="cd">-- | Find the substitution for an 'Id' in the 'Subst'</span></span>
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<pre style="margin: 0;">-<span id="LC249" class="line" lang="haskell"><span class="n" style="color: #333;">lookupIdSubst</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">SDoc</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-</span>></span> <span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">-<span id="LC250" class="line" lang="haskell"><span class="n" style="color: #333;">lookupIdSubst</span> <span class="n" style="color: #333;"><span class="idiff left">doc</span></span><span class="idiff right"> </span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">ids</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">+<span id="LC249" class="line" lang="haskell"><span class="n" style="color: #333;">lookupIdSubst</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">HasDebugCallStack</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">=</span>></span> <span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC250" class="line" lang="haskell"><span class="n" style="color: #333;">lookupIdSubst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">ids</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC251" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isLocalId</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC252" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">ids</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC253" 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;">v'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupInScope</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v'</span></span>
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<pre style="margin: 0;"> <span id="LC254" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Vital! See Note [Extending the Subst]</span></span>
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<pre style="margin: 0;">-<span id="LC255" 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;">WARN</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"GHC.Core.Subst.lookupIdSubst"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;"><span class="idiff left">doc</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">+<span id="LC255" 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;">WARN</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"GHC.Core.Subst.lookupIdSubst"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC256" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">in_scope</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC258" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -338,26 +338,25 @@ instance Outputable Subst where</td>
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<pre style="margin: 0;"> <span id="LC338" 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="LC339" 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="LC340" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC341" class="line" lang="haskell"><span class="cd">-- | Apply a substitution to an entire 'CoreExpr'. Remember, you may only</span></span>
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<pre style="margin: 0;">-<span id="LC342" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- apply the substitution /once/:</span></span>
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"><span class="n" style="color: #333;">substExprSC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HasDebugCallStack</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Just like substExpr, but a no-op if the substitution is empty</span></span>
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"><span class="n" style="color: #333;">substExprSC</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">orig_expr</span></span>
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptySubst</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">orig_expr</span></span>
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<pre style="margin: 0;">+<span id="LC345" 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="c1" style="color: #998; font-style: italic;">-- pprTrace "enter subst-expr" (doc $$ ppr orig_expr) $</span></span>
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"> <span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">orig_expr</span></span>
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="haskell"><span class="cd">-- | substExpr applies a substitution to an entire 'CoreExpr'. Remember,</span></span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- you may only apply the substitution /once/:</span></span>
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<pre style="margin: 0;"> <span id="LC350" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Substitutions apply only once] in "GHC.Core.TyCo.Subst"</span></span>
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<pre style="margin: 0;"> <span id="LC351" 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="LC352" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Do *not* attempt to short-cut in the case of an empty substitution!</span></span>
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<pre style="margin: 0;"> <span id="LC353" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Extending the Subst]</span></span>
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<pre style="margin: 0;">-<span id="LC347" class="line" lang="haskell"><span class="n" style="color: #333;">substExprSC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">-<span id="LC348" class="line" lang="haskell"><span class="n" style="color: #333;">substExprSC</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">orig_expr</span></span>
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<pre style="margin: 0;">-<span id="LC349" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptySubst</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">orig_expr</span></span>
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<pre style="margin: 0;">-<span id="LC350" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "enter subst-expr" (doc $$ ppr orig_expr) $</span></span>
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<pre style="margin: 0;">-<span id="LC351" class="line" lang="haskell"> <span class="n" style="color: #333;">subst_expr</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">orig_expr</span></span>
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<pre style="margin: 0;">-<span id="LC352" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="haskell"><span class="n" style="color: #333;">substExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">-<span id="LC354" class="line" lang="haskell"><span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">orig_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">subst_expr</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">orig_expr</span></span>
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<pre style="margin: 0;">-<span id="LC356" class="line" lang="haskell"><span class="n" style="color: #333;">subst_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">-<span id="LC357" class="line" lang="haskell"><span class="n" style="color: #333;">subst_expr</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"><span class="n" style="color: #333;">substExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HasDebugCallStack</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- HasDebugCallStack so we can track failures in lookupIdSubst</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC357" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC358" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC360" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">doc</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"subst_expr"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC360" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="p">(</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="p">(</span><span class="n" style="color: #333;">substCo</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC362" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lit</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Lit</span> <span class="n" style="color: #333;">lit</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">@@ -370,11 +369,11 @@ subst_expr doc subst expr</td>
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<pre style="margin: 0;"> <span id="LC369" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- lose a binder. We optimise the LHS of rules at</span></span>
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- construction time</span></span>
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<pre style="margin: 0;"> <span id="LC371" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC373" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">bndr'</span> <span class="p">(</span><span class="n" style="color: #333;">subst<span class="idiff left">_expr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">doc</span></span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">bndr'</span> <span class="p">(</span><span class="n" style="color: #333;">subst<span class="idiff left right">Expr</span></span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC373" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">bndr'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substBndr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;"> <span id="LC375" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Let</span> <span class="n" style="color: #333;">bind</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Let</span> <span class="n" style="color: #333;">bind'</span> <span class="p">(</span><span class="n" style="color: #333;">subst<span class="idiff left">_expr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">doc</span></span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Let</span> <span class="n" style="color: #333;">bind</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Let</span> <span class="n" style="color: #333;">bind'</span> <span class="p">(</span><span class="n" style="color: #333;">subst<span class="idiff left right">Expr</span></span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC377" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC378" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">bind'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substBind</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">bind</span></span>
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<pre style="margin: 0;"> <span id="LC379" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -382,13 +381,13 @@ subst_expr doc subst expr</td>
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<pre style="margin: 0;"> <span id="LC381" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC382" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">bndr'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substBndr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC385" class="line" lang="haskell"> <span class="n" style="color: #333;">go_alt</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">con</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</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;">bndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">subst<span class="idiff left">_expr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">doc</span></span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"> <span class="n" style="color: #333;">go_alt</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">con</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</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;">bndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">subst<span class="idiff left right">Expr</span></span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substBndrs</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"><span class="cd">-- | Apply a substitution to an entire 'CoreBind', additionally returning an updated 'Subst'</span></span>
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<pre style="margin: 0;"> <span id="LC389" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that should be used by subsequent substitutions.</span></span>
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<pre style="margin: 0;">-<span id="LC391" class="line" lang="haskell"><span class="n" style="color: #333;">substBind</span><span class="p">,</span> <span class="n" style="color: #333;">substBindSC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreBind</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Subst</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="LC390" class="line" lang="haskell"><span class="n" style="color: #333;">substBind</span><span class="p">,</span> <span class="n" style="color: #333;">substBindSC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">HasDebugCallStack</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreBind</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Subst</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="LC391" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC392" class="line" lang="haskell"><span class="n" style="color: #333;">substBindSC</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">bind</span> <span class="c1" style="color: #998; font-style: italic;">-- Short-cut if the substitution is empty</span></span>
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<pre style="margin: 0;"> <span id="LC393" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isEmptySubst</span> <span class="n" style="color: #333;">subst</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">@@ -405,10 +404,10 @@ substBindSC subst bind -- Short-cut if the substitution is empty</td>
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<pre style="margin: 0;"> <span id="LC404" class="line" lang="haskell"> <span class="n" style="color: #333;">rhss'</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptySubst</span> <span class="n" style="color: #333;">subst'</span></span>
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<pre style="margin: 0;"> <span id="LC405" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhss</span></span>
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<pre style="margin: 0;"> <span id="LC406" 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="LC408" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">subst<span class="idiff left">_expr</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"substBindSC"</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">subst'</span><span class="p">)</span> <span class="n" style="color: #333;">rhss</span></span>
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">subst<span class="idiff left right">Expr</span></span> <span class="n" style="color: #333;">subst'</span><span class="p">)</span> <span class="n" style="color: #333;">rhss</span></span>
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409
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell"><span class="n" style="color: #333;">substBind</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC411" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">bndr'</span> <span class="p">(</span><span class="n" style="color: #333;">subst<span class="idiff left">_expr</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"substBind"</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">rhs</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">bndr'</span> <span class="p">(</span><span class="n" style="color: #333;">subst<span class="idiff left right">Expr</span></span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">rhs</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">bndr'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substBndr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -417,7 +416,7 @@ substBind subst (Rec pairs)</td>
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC417" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">rhss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unzip</span> <span class="n" style="color: #333;">pairs</span></span>
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419
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418
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<pre style="margin: 0;"> <span id="LC418" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substRecBndrs</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;">-<span id="LC420" class="line" lang="haskell"> <span class="n" style="color: #333;">rhss'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">subst<span class="idiff left">_expr</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"substBind"</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">subst'</span><span class="p">)</span> <span class="n" style="color: #333;">rhss</span></span>
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<pre style="margin: 0;">+<span id="LC419" class="line" lang="haskell"> <span class="n" style="color: #333;">rhss'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">subst<span class="idiff left right">Expr</span></span> <span class="n" style="color: #333;">subst'</span><span class="p">)</span> <span class="n" style="color: #333;">rhss</span></span>
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<pre style="margin: 0;"> <span id="LC420" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC421" class="line" lang="haskell"><span class="cd">-- | De-shadowing the program is sometimes a useful pre-pass. It can be done simply</span></span>
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<pre style="margin: 0;"> <span id="LC422" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- by running over the bindings with an empty substitution, because substitution</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -638,7 +637,7 @@ substUnfolding subst df@(DFunUnfolding { df_bndrs = bndrs, df_args = args })</td>
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<pre style="margin: 0;"> <span id="LC637" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">df</span> <span class="p">{</span> <span class="n" style="color: #333;">df_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">df_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args'</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span><span class="n" style="color: #333;">bndrs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substBndrs</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;">-<span id="LC641" class="line" lang="haskell"> <span class="n" style="color: #333;">args'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">substExpr</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"subst-unf:dfun"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst'</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"> <span class="n" style="color: #333;">args'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;">subst'</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC641" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC642" class="line" lang="haskell"><span class="n" style="color: #333;">substUnfolding</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">unf</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoreUnfolding</span> <span class="p">{</span> <span class="n" style="color: #333;">uf_tmpl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tmpl</span><span class="p">,</span> <span class="n" style="color: #333;">uf_src</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">src</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Retain an InlineRule!</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">@@ -648,14 +647,14 @@ substUnfolding subst unf@(CoreUnfolding { uf_tmpl = tmpl, uf_src = src })</td>
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">seqExpr</span> <span class="n" style="color: #333;">new_tmpl</span> <span class="p">`</span><span class="n" style="color: #333;">seq</span><span class="p">`</span></span>
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<pre style="margin: 0;"> <span id="LC648" class="line" lang="haskell"> <span class="n" style="color: #333;">unf</span> <span class="p">{</span> <span class="n" style="color: #333;">uf_tmpl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_tmpl</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC649" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC651" class="line" lang="haskell"> <span class="n" style="color: #333;">new_tmpl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substExpr</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"subst-unf"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tmpl</span></span>
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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"> <span class="n" style="color: #333;">new_tmpl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tmpl</span></span>
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<pre style="margin: 0;"> <span id="LC651" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC652" class="line" lang="haskell"><span class="n" style="color: #333;">substUnfolding</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unf</span> <span class="c1" style="color: #998; font-style: italic;">-- NoUnfolding, OtherCon</span></span>
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<pre style="margin: 0;"> <span id="LC653" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC654" 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="LC655" class="line" lang="haskell"><span class="n" style="color: #333;">substIdOcc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span></span>
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<pre style="margin: 0;"> <span id="LC656" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- These Ids should not be substituted to non-Ids</span></span>
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<pre style="margin: 0;">-<span id="LC658" class="line" lang="haskell"><span class="n" style="color: #333;">substIdOcc</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"substIdOcc"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">v</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"><span class="n" style="color: #333;">substIdOcc</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">v</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC658" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">v'</span></span>
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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell"> <span class="n" style="color: #333;">other</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"substIdOcc"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">other</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">subst</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC660" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -693,12 +692,11 @@ substRule subst subst_ru_fn rule@(Rule { ru_bndrs = bndrs, ru_args = args</td>
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<pre style="margin: 0;"> <span id="LC692" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ru_fn</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">is_local</span></span>
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<pre style="margin: 0;"> <span id="LC693" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">subst_ru_fn</span> <span class="n" style="color: #333;">fn_name</span></span>
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">fn_name</span></span>
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<pre style="margin: 0;">-<span id="LC696" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ru_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;"><span class="idiff left">doc</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst'</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC697" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ru_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substExpr</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"foo"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">rhs</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC695" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ru_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;">subst'</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ru_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">rhs</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC697" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do NOT optimise the RHS (previously we did simplOptExpr here)</span></span>
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<pre style="margin: 0;"> <span id="LC698" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Substitute lazily]</span></span>
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<pre style="margin: 0;"> <span id="LC699" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC701" class="line" lang="haskell"> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"subst-rule"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fn_name</span></span>
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substBndrs</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -707,7 +705,7 @@ substDVarSet subst fvs</td>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkDVarSet</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">subst_fv</span> <span class="n" style="color: #333;">subst</span><span class="p">)</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;">emptyVarSet</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">dVarSetElems</span> <span class="n" style="color: #333;">fvs</span></span>
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"> <span class="n" style="color: #333;">subst_fv</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">fv</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;">-<span id="LC710" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">fv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expr_fvs</span> <span class="p">(</span><span class="n" style="color: #333;">lookupIdSubst</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"substDVarSet"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">fv</span><span class="p">)</span> <span class="n" style="color: #333;">isLocalVar</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;">+<span id="LC708" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">fv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expr_fvs</span> <span class="p">(</span><span class="n" style="color: #333;">lookupIdSubst</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">fv</span><span class="p">)</span> <span class="n" style="color: #333;">isLocalVar</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;"> <span id="LC709" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoFVsOfType</span> <span class="p">(</span><span class="n" style="color: #333;">lookupTCvSubst</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">fv</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;"> <span id="LC710" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC711" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -715,7 +713,7 @@ substTickish :: Subst -> Tickish Id -> Tickish Id</td>
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<pre style="margin: 0;"> <span id="LC713" class="line" lang="haskell"><span class="n" style="color: #333;">substTickish</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Breakpoint</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">ids</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Breakpoint</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">do_one</span> <span class="n" style="color: #333;">ids</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC715" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC718" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getIdFromTrivialExpr</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"subst_tickish"</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst</span></span>
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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getIdFromTrivialExpr</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="n" style="color: #333;">subst</span></span>
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<pre style="margin: 0;"> <span id="LC717" class="line" lang="haskell"><span class="n" style="color: #333;">substTickish</span> <span class="n" style="color: #333;">_subst</span> <span class="n" style="color: #333;">other</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">other</span></span>
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<pre style="margin: 0;"> <span id="LC718" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC719" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Substitute lazily]</span></span>
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