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<h3>
Ben Gamari pushed to branch wip/runRW
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a5d42156a0581bf7696a6ffd7c2cc250247d48a0">a5d42156</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-04-24T18:29:33+00:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">runRW
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<h4>5 changed files:</h4>
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<li class="file-stats">
<a href="#0887cf39c5cdf9cf8d6758f410d7dab3023c0d77">
compiler/GHC/Builtin/Names.hs
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<li class="file-stats">
<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
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<li class="file-stats">
<a href="#cc763cdd1967f5d921161a32f64136cfcf0332c5">
compiler/GHC/Core/Opt/SetLevels.hs
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<li class="file-stats">
<a href="#a5d27de4e3111a69f69902c65ecf7b3379f7c49a">
compiler/GHC/CoreToStg/Prep.hs
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<li class="file-stats">
<a href="#261c0c5029eb34eb7436b087d77314f377ff8223">
compiler/GHC/Types/Id/Make.hs
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<h4>Changes:</h4>
<li id="0887cf39c5cdf9cf8d6758f410d7dab3023c0d77">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a5d42156a0581bf7696a6ffd7c2cc250247d48a0#0887cf39c5cdf9cf8d6758f410d7dab3023c0d77"><strong>compiler/GHC/Builtin/Names.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">@@ -246,7 +246,6 @@ basicKnownKeyNames</td>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [TyConRepNames for non-wired-in TyCons]</span></span>
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<pre style="margin: 0;"> <span id="LC247" class="line" lang="haskell"> <span class="n" style="color: #333;">ioTyConName</span><span class="p">,</span> <span class="n" style="color: #333;">ioDataConName</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC248" class="line" lang="haskell"> <span class="n" style="color: #333;">runMainIOName</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC249" class="line" lang="haskell"> <span class="n" style="color: #333;">runRWName</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC249" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC250" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Type representation types</span></span>
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<pre style="margin: 0;"> <span id="LC251" class="line" lang="haskell"> <span class="n" style="color: #333;">trModuleTyConName</span><span class="p">,</span> <span class="n" style="color: #333;">trModuleDataConName</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">@@ -912,9 +911,8 @@ and it's convenient to write them all down in one place.</td>
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<pre style="margin: 0;"> <span id="LC911" class="line" lang="haskell"><span class="n" style="color: #333;">wildCardName</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;"> <span id="LC912" class="line" lang="haskell"><span class="n" style="color: #333;">wildCardName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSystemVarName</span> <span class="n" style="color: #333;">wildCardKey</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"wild"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC913" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC915" class="line" lang="haskell"><span class="n" style="color: #333;">runMainIOName</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">runRWName</span></span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;">+<span id="LC914" class="line" lang="haskell"><span class="n" style="color: #333;">runMainIOName</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;"> <span id="LC915" class="line" lang="haskell"><span class="n" style="color: #333;">runMainIOName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varQual</span> <span class="n" style="color: #333;">gHC_TOP_HANDLER</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"runMainIO"</span><span class="p">)</span> <span class="n" style="color: #333;">runMainKey</span></span>
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<pre style="margin: 0;">-<span id="LC917" class="line" lang="haskell"><span class="n" style="color: #333;">runRWName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varQual</span> <span class="n" style="color: #333;">gHC_MAGIC</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"runRW#"</span><span class="p">)</span> <span class="n" style="color: #333;">runRWKey</span></span>
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<pre style="margin: 0;"> <span id="LC916" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"><span class="n" style="color: #333;">orderingTyConName</span><span class="p">,</span> <span class="n" style="color: #333;">ordLTDataConName</span><span class="p">,</span> <span class="n" style="color: #333;">ordEQDataConName</span><span class="p">,</span> <span class="n" style="color: #333;">ordGTDataConName</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;"> <span id="LC918" class="line" lang="haskell"><span class="n" style="color: #333;">orderingTyConName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcQual</span> <span class="n" style="color: #333;">gHC_TYPES</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"Ordering"</span><span class="p">)</span> <span class="n" style="color: #333;">orderingTyConKey</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">@@ -764,6 +764,40 @@ we will check any unfolding after it has been unfolded; checking the</td>
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<pre style="margin: 0;"> <span id="LC764" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unfolding beforehand is merely an optimization, and one that actively</span></span>
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765
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<pre style="margin: 0;"> <span id="LC765" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">hurts us here.</span></span>
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<pre style="margin: 0;"> <span id="LC766" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Linting of runRW#]</span></span>
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<pre style="margin: 0;">+<span id="LC768" 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="LC769" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">runRW# has some very peculiar behavior (see Note [runRW magic] in</span></span>
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<pre style="margin: 0;">+<span id="LC770" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.CoreToStg.Prep) which CoreLint must accommodate.</span></span>
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As described in Note [Casts and lambdas] in</span></span>
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Core.Opt.Simplify.Utils, the simplifier pushes casts out of</span></span>
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">lambdas. Concretely, the simplifier will transform</span></span>
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC776" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> runRW# @r @ty (\s -> expr `cast` co)</span></span>
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">into</span></span>
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<pre style="margin: 0;">+<span id="LC780" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> runRW# @r @ty ((\s -> expr) `cast` co)</span></span>
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781
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<pre style="margin: 0;">+<span id="LC781" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consequently we need to handle the case that the continuation is a</span></span>
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">cast of a lambda. See Note [Casts and lambdas] in</span></span>
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784
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Core.Opt.Simplify.Utils.</span></span>
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785
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"></span>
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786
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<pre style="margin: 0;">+<span id="LC786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the event that the continuation is headed by a lambda (which</span></span>
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787
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<pre style="margin: 0;">+<span id="LC787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will bind the State# token) we can safely allow calls to join</span></span>
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<pre style="margin: 0;">+<span id="LC788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">points since CorePrep is going to apply the continuation to</span></span>
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<pre style="margin: 0;">+<span id="LC789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">RealWorld.</span></span>
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the case that the continuation is not a lambda we lint the</span></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">continuation disallowing join points, to rule out things like,</span></span>
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> join j = ...</span></span>
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<pre style="margin: 0;">+<span id="LC795" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in runRW# @r @ty (</span></span>
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let x = jump j</span></span>
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<pre style="margin: 0;">+<span id="LC797" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in x</span></span>
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<pre style="margin: 0;">+<span id="LC798" 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="LC799" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC801" 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="LC802" 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="LC803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\subsection[lintCoreExpr]{lintCoreExpr}</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">@@ -875,15 +909,16 @@ lintCoreExpr e@(App _ _)</td>
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<pre style="margin: 0;"> <span id="LC909" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">arg_ty1</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">arg_ty2</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">arg3</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rest</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC910" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">fun_ty1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintCoreArg</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="n" style="color: #333;">arg_ty1</span></span>
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<pre style="margin: 0;"> <span id="LC911" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">fun_ty2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintCoreArg</span> <span class="n" style="color: #333;">fun_ty1</span> <span class="n" style="color: #333;">arg_ty2</span></span>
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<pre style="margin: 0;">-<span id="LC878" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The simplifier pushes casts out of the continuation lambda;</span></span>
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<pre style="margin: 0;">-<span id="LC879" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- consequently we need to handle the case that the continuation is a</span></span>
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<pre style="margin: 0;">-<span id="LC880" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- cast lambda. See Note [Casts and lambdas] in</span></span>
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<pre style="margin: 0;">-<span id="LC881" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Core.Opt.Simplify.Utils.</span></span>
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<pre style="margin: 0;">-<span id="LC882" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg3_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">arg3</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC883" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC884" class="line" lang="haskell"> <span class="n" style="color: #333;">expr_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintJoinLams</span> <span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC885" class="line" lang="haskell"> <span class="n" style="color: #333;">lintCastExpr</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">expr_ty</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">-<span id="LC886" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">lintJoinLams</span> <span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="n" style="color: #333;">arg3</span></span>
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<pre style="margin: 0;">+<span id="LC912" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Linting of runRW#]</span></span>
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<pre style="margin: 0;">+<span id="LC913" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreArg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="kt" style="color: #458; font-weight: 600;">LintedType</span></span>
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<pre style="margin: 0;">+<span id="LC914" class="line" lang="haskell"> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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915
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<pre style="margin: 0;">+<span id="LC915" class="line" lang="haskell"> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="n" style="color: #333;">expr</span></span>
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916
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<pre style="margin: 0;">+<span id="LC916" class="line" lang="haskell"> <span class="n" style="color: #333;">lintCastExpr</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">co</span></span>
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917
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<pre style="margin: 0;">+<span id="LC917" class="line" lang="haskell"> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="n" style="color: #333;">expr</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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918
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<pre style="margin: 0;">+<span id="LC918" class="line" lang="haskell"> <span class="n" style="color: #333;">lintJoinLams</span> <span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="n" style="color: #333;">expr</span></span>
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919
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<pre style="margin: 0;">+<span id="LC919" class="line" lang="haskell"> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="n" style="color: #333;">other</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">markAllJoinsBad</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">lintCoreExpr</span> <span class="n" style="color: #333;">other</span></span>
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<pre style="margin: 0;">+<span id="LC920" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: Look through ticks?</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;">arg3_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="n" style="color: #333;">arg3</span></span>
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922
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<pre style="margin: 0;"> <span id="LC922" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">app_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintValApp</span> <span class="n" style="color: #333;">arg3</span> <span class="n" style="color: #333;">fun_ty2</span> <span class="n" style="color: #333;">arg3_ty</span></span>
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<pre style="margin: 0;"> <span id="LC923" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintCoreArgs</span> <span class="n" style="color: #333;">app_ty</span> <span class="n" style="color: #333;">rest</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC924" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a5d42156a0581bf7696a6ffd7c2cc250247d48a0#cc763cdd1967f5d921161a32f64136cfcf0332c5"><strong>compiler/GHC/Core/Opt/SetLevels.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">@@ -403,7 +403,8 @@ lvlApp :: LevelEnv</td>
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<pre style="margin: 0;"> <span id="LC403" 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;">CoreExprWithFVs</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreExprWithFVs</span><span class="p">])</span> <span class="c1" style="color: #998; font-style: italic;">-- Input application</span></span>
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<pre style="margin: 0;"> <span id="LC404" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LvlM</span> <span class="kt" style="color: #458; font-weight: 600;">LevelledExpr</span> <span class="c1" style="color: #998; font-style: italic;">-- Result expression</span></span>
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<pre style="margin: 0;"> <span id="LC405" class="line" lang="haskell"><span class="n" style="color: #333;">lvlApp</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">orig_expr</span> <span class="p">((</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">AnnVar</span> <span class="n" style="color: #333;">fn</span><span class="p">),</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC406" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: runRW#'s continuation must remain a join point; don't float!</span></span>
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<pre style="margin: 0;">+<span id="LC406" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Try to ensure that runRW#'s continuation isn't floated out.</span></span>
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Simplification of runRW#].</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;">fn</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">runRWKey</span></span>
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">args'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">lvlExpr</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC410" 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;">foldl'</span> <span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="p">(</span><span class="n" style="color: #333;">lookupVar</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">fn</span><span class="p">)</span> <span class="n" style="color: #333;">args'</span><span class="p">)</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">@@ -974,8 +974,78 @@ pragma. It is levity-polymorphic.</td>
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<pre style="margin: 0;"> <span id="LC974" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> => (State# RealWorld -> (# State# RealWorld, o #))</span></span>
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<pre style="margin: 0;"> <span id="LC975" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> (# State# RealWorld, o #)</span></span>
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<pre style="margin: 0;"> <span id="LC976" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC977" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It needs no special treatment in GHC except this special inlining here</span></span>
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<pre style="margin: 0;">-<span id="LC978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in CorePrep (and in GHC.CoreToByteCode).</span></span>
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It's correctness needs no special treatment in GHC except this special inlining</span></span>
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">here in CorePrep (and in GHC.CoreToByteCode).</span></span>
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<pre style="margin: 0;">+<span id="LC979" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC980" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, there are a variety of optimisation opportunities that the simplifier</span></span>
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<pre style="margin: 0;">+<span id="LC981" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">takes advantage of. See Note [Simplification of runRW#].</span></span>
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<pre style="margin: 0;">+<span id="LC982" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC983" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC984" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Simplification of runRW#]</span></span>
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985
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<pre style="margin: 0;">+<span id="LC985" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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986
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<pre style="margin: 0;">+<span id="LC986" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider the program,</span></span>
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987
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<pre style="margin: 0;">+<span id="LC987" class="line" lang="haskell"></span>
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988
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<pre style="margin: 0;">+<span id="LC988" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case runRW# (\s -> let n = I# 42# in n) of</span></span>
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989
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<pre style="margin: 0;">+<span id="LC989" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> I# n# -> f n#</span></span>
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990
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<pre style="margin: 0;">+<span id="LC990" class="line" lang="haskell"></span>
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991
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<pre style="margin: 0;">+<span id="LC991" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There is no reason why we should allocate an I# constructor given that we</span></span>
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992
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<pre style="margin: 0;">+<span id="LC992" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">immediately destructure it. To avoid this the simplifier will push strict</span></span>
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993
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<pre style="margin: 0;">+<span id="LC993" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">contexts into runRW's continuation. That is, it transforms</span></span>
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994
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<pre style="margin: 0;">+<span id="LC994" class="line" lang="haskell"></span>
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995
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<pre style="margin: 0;">+<span id="LC995" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> K[ runRW# @r @ty cont ]</span></span>
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996
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<pre style="margin: 0;">+<span id="LC996" 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="LC997" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> runRW# @r @ty K[cont]</span></span>
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998
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<pre style="margin: 0;">+<span id="LC998" class="line" lang="haskell"></span>
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999
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<pre style="margin: 0;">+<span id="LC999" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This has a few interesting implications. Consider, for instance, this program:</span></span>
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1000
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<pre style="margin: 0;">+<span id="LC1000" class="line" lang="haskell"></span>
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1001
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<pre style="margin: 0;">+<span id="LC1001" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> join j = ...</span></span>
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1002
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<pre style="margin: 0;">+<span id="LC1002" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in case runRW# @r @ty cont of</span></span>
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1003
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<pre style="margin: 0;">+<span id="LC1003" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> result -> jump j result</span></span>
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1004
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<pre style="margin: 0;">+<span id="LC1004" class="line" lang="haskell"></span>
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1005
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<pre style="margin: 0;">+<span id="LC1005" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Performing the transform described above would result in:</span></span>
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1006
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"></span>
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1007
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> join j x = ...</span></span>
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1008
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<pre style="margin: 0;">+<span id="LC1008" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in runRW# @r @ty (\s -></span></span>
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1009
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<pre style="margin: 0;">+<span id="LC1009" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case cont of in</span></span>
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1010
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<pre style="margin: 0;">+<span id="LC1010" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> result -> jump j result</span></span>
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1011
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<pre style="margin: 0;">+<span id="LC1011" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> )</span></span>
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1012
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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="cm" style="color: #998; font-style: italic;">If runRW# were a "normal" function this call to join point j would not be</span></span>
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1014
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<pre style="margin: 0;">+<span id="LC1014" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">allowed in its continuation argument. However, since runRW# is inlined (as</span></span>
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1015
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<pre style="margin: 0;">+<span id="LC1015" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">described in Note [runRW magic] above), this is completely fine.</span></span>
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1016
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<pre style="margin: 0;">+<span id="LC1016" class="line" lang="haskell"></span>
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1017
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<pre style="margin: 0;">+<span id="LC1017" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Moreover, it's helpful to ensure that runRW's continuation isn't floated out</span></span>
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1018
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(since doing so would then require a call, whereas we would otherwise end up</span></span>
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1019
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with straight-line). Consequently, GHC.Core.Opt.SetLevels.lvlApp has special</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1020" 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">
1020
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<pre style="margin: 0;">+<span id="LC1020" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">treatment for runRW# applications, ensure the arguments are not floated if</span></span>
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1021
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<pre style="margin: 0;">+<span id="LC1021" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">MFEs.</span></span>
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1022
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"></span>
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1023
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consequently, Core Lint has some special treatment to allow this behavior (see</span></span>
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1024
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<pre style="margin: 0;">+<span id="LC1024" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Linting of runRW#]).</span></span>
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1025
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<pre style="margin: 0;">+<span id="LC1025" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1026" 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">
1026
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<pre style="margin: 0;">+<span id="LC1026" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Other considered designs</span></span>
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<td class="diff-line-num new new_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">
1027
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<pre style="margin: 0;">+<span id="LC1027" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">------------------------</span></span>
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1028
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<pre style="margin: 0;">+<span id="LC1028" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1029" 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">
1029
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<pre style="margin: 0;">+<span id="LC1029" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">One design that was rejected was to *require* that runRW#'s continuation be</span></span>
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1030
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<pre style="margin: 0;">+<span id="LC1030" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">headed by a lambda. However, this proved to be quite fragile. For instance,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1031" 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">
1031
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<pre style="margin: 0;">+<span id="LC1031" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">SetLevels is very eager to float bottoming expressions. For instance given</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1032" 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">
1032
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<pre style="margin: 0;">+<span id="LC1032" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">something of the form,</span></span>
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1033
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<pre style="margin: 0;">+<span id="LC1033" class="line" lang="haskell"></span>
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1034
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<pre style="margin: 0;">+<span id="LC1034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> runRW# @r @ty (\s -> case expr of x -> undefined)</span></span>
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1035
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<pre style="margin: 0;">+<span id="LC1035" class="line" lang="haskell"></span>
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1036
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<pre style="margin: 0;">+<span id="LC1036" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">SetLevels will see that the body the lambda is bottoming and will consequently</span></span>
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1037
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<pre style="margin: 0;">+<span id="LC1037" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">float it to the top-level (assuming expr has no free coercion variables which</span></span>
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1038
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<pre style="margin: 0;">+<span id="LC1038" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">prevent this). We therefore end up with</span></span>
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1039
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<pre style="margin: 0;">+<span id="LC1039" class="line" lang="haskell"></span>
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1040
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<pre style="margin: 0;">+<span id="LC1040" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> runRW# @r @ty (\s -> lvl s)</span></span>
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1041
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<pre style="margin: 0;">+<span id="LC1041" class="line" lang="haskell"></span>
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1042
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<pre style="margin: 0;">+<span id="LC1042" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which the simplifier will beta reduce, leaving us with</span></span>
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1043
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<pre style="margin: 0;">+<span id="LC1043" class="line" lang="haskell"></span>
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1044
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<pre style="margin: 0;">+<span id="LC1044" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> runRW# @r @ty lvl</span></span>
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1045
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<pre style="margin: 0;">+<span id="LC1045" class="line" lang="haskell"></span>
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1046
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<pre style="margin: 0;">+<span id="LC1046" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Breaking our desired invariant. Ultimately we decided to simply accept that</span></span>
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1047
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<pre style="margin: 0;">+<span id="LC1047" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the continuation may not be a manifest lambda.</span></span>
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1048
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<pre style="margin: 0;">+<span id="LC1048" class="line" lang="haskell"></span>
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979
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1049
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<pre style="margin: 0;"> <span id="LC1049" class="line" lang="haskell"></span>
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1050
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<pre style="margin: 0;"> <span id="LC1050" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- ---------------------------------------------------------------------------</span></span>
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981
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1051
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<pre style="margin: 0;"> <span id="LC1051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- CpeArg: produces a result satisfying CpeArg</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a5d42156a0581bf7696a6ffd7c2cc250247d48a0#261c0c5029eb34eb7436b087d77314f377ff8223"><strong>compiler/GHC/Types/Id/Make.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">@@ -147,7 +147,7 @@ wiredInIds</td>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">errorIds</span> <span class="c1" style="color: #998; font-style: italic;">-- Defined in GHC.Core.Make</span></span>
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148
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148
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"></span>
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149
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="haskell"><span class="n" style="color: #333;">magicIds</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [magicIds]</span></span>
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150
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<pre style="margin: 0;">-<span id="LC150" class="line" lang="haskell"><span class="n" style="color: #333;">magicIds</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">lazyId</span><span class="p">,</span> <span class="n" style="color: #333;">oneShotId</span><span class="p">,</span> <span class="n" style="color: #333;">noinlineId</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"><span class="n" style="color: #333;">magicIds</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">lazyId</span><span class="p">,</span> <span class="n" style="color: #333;">oneShotId</span><span class="p">,</span> <span class="n" style="color: #333;">noinlineId</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">runRWId</span></span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="haskell"><span class="n" style="color: #333;">ghcPrimIds</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [ghcPrimIds (aka pseudoops)]</span></span>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="haskell"><span class="n" style="color: #333;">ghcPrimIds</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">@@ -1323,10 +1323,11 @@ magicDictName = mkWiredInIdName gHC_PRIM (fsLit "magicDict") magicDict</td>
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<pre style="margin: 0;"> <span id="LC1323" class="line" lang="haskell"><span class="n" style="color: #333;">coerceName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkWiredInIdName</span> <span class="n" style="color: #333;">gHC_PRIM</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"coerce"</span><span class="p">)</span> <span class="n" style="color: #333;">coerceKey</span> <span class="n" style="color: #333;">coerceId</span></span>
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<pre style="margin: 0;"> <span id="LC1324" class="line" lang="haskell"><span class="n" style="color: #333;">proxyName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkWiredInIdName</span> <span class="n" style="color: #333;">gHC_PRIM</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"proxy#"</span><span class="p">)</span> <span class="n" style="color: #333;">proxyHashKey</span> <span class="n" style="color: #333;">proxyHashId</span></span>
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1325
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<pre style="margin: 0;"> <span id="LC1325" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1326" class="line" lang="haskell"><span class="n" style="color: #333;">lazyIdName</span><span class="p">,</span> <span class="n" style="color: #333;">oneShotName</span><span class="p">,</span> <span class="n" style="color: #333;">noinlineIdName</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;">+<span id="LC1326" class="line" lang="haskell"><span class="n" style="color: #333;">lazyIdName</span><span class="p">,</span> <span class="n" style="color: #333;">oneShotName</span><span class="p">,</span> <span class="n" style="color: #333;">noinlineIdName</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">runRWIdName</span></span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;"> <span id="LC1327" class="line" lang="haskell"><span class="n" style="color: #333;">lazyIdName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkWiredInIdName</span> <span class="n" style="color: #333;">gHC_MAGIC</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"lazy"</span><span class="p">)</span> <span class="n" style="color: #333;">lazyIdKey</span> <span class="n" style="color: #333;">lazyId</span></span>
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<pre style="margin: 0;"> <span id="LC1328" class="line" lang="haskell"><span class="n" style="color: #333;">oneShotName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkWiredInIdName</span> <span class="n" style="color: #333;">gHC_MAGIC</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"oneShot"</span><span class="p">)</span> <span class="n" style="color: #333;">oneShotKey</span> <span class="n" style="color: #333;">oneShotId</span></span>
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<pre style="margin: 0;"> <span id="LC1329" class="line" lang="haskell"><span class="n" style="color: #333;">noinlineIdName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkWiredInIdName</span> <span class="n" style="color: #333;">gHC_MAGIC</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"noinline"</span><span class="p">)</span> <span class="n" style="color: #333;">noinlineIdKey</span> <span class="n" style="color: #333;">noinlineId</span></span>
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<pre style="margin: 0;">+<span id="LC1330" class="line" lang="haskell"><span class="n" style="color: #333;">runRWIdName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkWiredInIdName</span> <span class="n" style="color: #333;">gHC_MAGIC</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"runRW#"</span><span class="p">)</span> <span class="n" style="color: #333;">runRWKey</span> <span class="n" style="color: #333;">runRWId</span></span>
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<pre style="margin: 0;"> <span id="LC1331" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1332" 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="LC1333" class="line" lang="haskell"><span class="n" style="color: #333;">proxyHashId</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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1409,6 +1410,13 @@ oneShotId = pcMiscPrelId oneShotName ty info</td>
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1410
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<pre style="margin: 0;"> <span id="LC1410" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">,</span> <span class="n" style="color: #333;">x'</span><span class="p">]</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1411" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">body</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">App</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>
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1412
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<pre style="margin: 0;"> <span id="LC1412" class="line" lang="haskell"></span>
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1413
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<pre style="margin: 0;">+<span id="LC1413" class="line" lang="haskell"><span class="n" style="color: #333;">runRWId</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [runRW magic] in GHC.CoreToStg.Prep</span></span>
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1414
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<pre style="margin: 0;">+<span id="LC1414" class="line" lang="haskell"><span class="n" style="color: #333;">runRWId</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pcMiscPrelId</span> <span class="n" style="color: #333;">runRWIdName</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">info</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1415" 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">
1415
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<pre style="margin: 0;">+<span id="LC1415" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1416
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<pre style="margin: 0;">+<span id="LC1416" class="line" lang="haskell"> <span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noCafIdInfo</span> <span class="p">`</span><span class="n" style="color: #333;">setStrictnessInfo</span><span class="p">`</span> <span class="n" style="color: #333;">mkClosedStrictSig</span> <span class="p">[</span><span class="n" style="color: #333;">strictApply1Dmd</span><span class="p">]</span> <span class="n" style="color: #333;">topDiv</span></span>
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<pre style="margin: 0;">+<span id="LC1417" class="line" lang="haskell"> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSpecForAllTys</span> <span class="p">[</span><span class="n" style="color: #333;">runtimeRep1TyVar</span><span class="p">,</span> <span class="n" style="color: #333;">openAlphaTyVar</span><span class="p">]</span> </span>
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<td class="diff-line-num new new_line" data-linenumber="1418" 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">
1418
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<pre style="margin: 0;">+<span id="LC1418" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkVisFunTy</span> <span class="p">(</span><span class="n" style="color: #333;">realWorldStatePrimTy</span> <span class="p">`</span><span class="n" style="color: #333;">mkVisFunTy</span><span class="p">`</span> <span class="n" style="color: #333;">openAlphaTy</span><span class="p">)</span> <span class="n" style="color: #333;">openAlphaTy</span></span>
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<pre style="margin: 0;">+<span id="LC1419" class="line" lang="haskell"></span>
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1412
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<pre style="margin: 0;"> <span id="LC1420" 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="LC1421" class="line" lang="haskell"><span class="n" style="color: #333;">magicDictId</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [magicDictId magic]</span></span>
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1414
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<pre style="margin: 0;"> <span id="LC1422" class="line" lang="haskell"><span class="n" style="color: #333;">magicDictId</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pcMiscPrelId</span> <span class="n" style="color: #333;">magicDictName</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">info</span></span>
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