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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>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7">014ed644</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-05-01T00:23:21Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Compute demand signatures assuming idArity
This does four things:
1. Look at `idArity` instead of manifest lambdas to decide whether to use LetUp
2. Compute the strictness signature in LetDown assuming at least `idArity`
incoming arguments
3. Remove the special case for trivial RHSs, which is subsumed by 2
4. Don't perform the W/W split when doing so would eta expand a binding.
Otherwise we would eta expand PAPs, causing unnecessary churn in the
Simplifier.
NoFib Results
--------------------------------------------------------------------------------
Program Allocs Instrs
--------------------------------------------------------------------------------
fannkuch-redux +0.3% 0.0%
gg -0.0% -0.1%
maillist +0.2% +0.2%
minimax 0.0% +0.8%
pretty 0.0% -0.1%
reptile -0.0% -1.2%
--------------------------------------------------------------------------------
Min -0.0% -1.2%
Max +0.3% +0.8%
Geometric Mean +0.0% -0.0%
</pre>
</li>
</ul>
<h4>17 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#10828b99499a9ef1e9839b007762c68994bcb036">
compiler/basicTypes/Demand.hs
</a>
</li>
<li class="file-stats">
<a href="#2c842f2f15e67826dc12cc363525b56acb7b7882">
compiler/basicTypes/Id.hs
</a>
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<li class="file-stats">
<a href="#6f7593803995899e68e1b976dcde5817ec0f2342">
compiler/basicTypes/IdInfo.hs
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<li class="file-stats">
<a href="#75c960e63e855ede311c1cf6d407b2bf0b742333">
compiler/basicTypes/Var.hs
</a>
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<li class="file-stats">
<a href="#ed7e37ad33aa047f1f6bc74d375c38e6484b231c">
compiler/coreSyn/CoreArity.hs
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<li class="file-stats">
<a href="#da5742c4b404a672740f0eef71683f5a8dd3818e">
compiler/coreSyn/CoreLint.hs
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<li class="file-stats">
<a href="#c9f253bc92ffa226506febcfb5ef5e67536616f2">
compiler/coreSyn/CoreUnfold.hs
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<li class="file-stats">
<a href="#5d79081946c94bec01bbf2f1ece6597a963760cd">
compiler/simplCore/SimplMonad.hs
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<li class="file-stats">
<a href="#32d53a69dcadfb969898a49221a1ff152ea0677a">
compiler/simplCore/SimplUtils.hs
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<li class="file-stats">
<a href="#ea6c99f43a7d52025b4dfaf7a7822038a54a9a84">
compiler/stranal/DmdAnal.hs
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<li class="file-stats">
<a href="#8459cd38c85420ab196f6823883c62b658b7edaa">
compiler/stranal/WorkWrap.hs
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<li class="file-stats">
<a href="#fefba0bb63e2af077c91206052f9c20caa85d3c7">
compiler/stranal/WwLib.hs
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<li class="file-stats">
<a href="#17688feb9e683bf0803ef737d589644e7e5e2621">
<span class="new-file">
+
testsuite/tests/perf/compiler/WWRec.hs
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<li class="file-stats">
<a href="#fd4a0b65d74153aed8b33b01a04eb3ff7442cd45">
testsuite/tests/perf/compiler/all.T
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<li class="file-stats">
<a href="#d340c7223099c3ed32a01d70b28784e163dcc29a">
<span class="new-file">
+
testsuite/tests/stranal/sigs/NewtypeArity.hs
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<li class="file-stats">
<a href="#e2b576f65c5d2bcf64ff0e18ec6110196b219762">
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+
testsuite/tests/stranal/sigs/NewtypeArity.stderr
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<li class="file-stats">
<a href="#6cd3b38f9f19c00c9fb48ff8a444f1534e54ad95">
testsuite/tests/stranal/sigs/all.T
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<h4>Changes:</h4>
<li id="10828b99499a9ef1e9839b007762c68994bcb036">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#10828b99499a9ef1e9839b007762c68994bcb036"><strong>compiler/basicTypes/Demand.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="22" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="22" 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">@@ -22,7 +22,7 @@ module Demand (</td>
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<td class="diff-line-num old_line" data-linenumber="22" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">dmdTypeDepth</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lubDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bothDmdType</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="24" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">nopDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">botDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkDmdType</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="25" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<td class="diff-line-num new_line old" data-linenumber="25" 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="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addDemand</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">removeDmdTy</span>Args</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="26" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="25" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addDemand</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">ensure</span>Args</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="26" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="26" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BothDmdArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkBothDmdArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">toBothDmdArg</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="27" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="28" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">emptyDmdEnv</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="34" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="34" 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">@@ -34,7 +34,7 @@ module Demand (</td>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">vanillaCprProdRes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cprSumRes</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">appIsBottom</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isBottomingSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprIfaceStrictSig</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">trimCPRInfo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">returnsCPR_maybe</span><span class="p">,</span></span>
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<td class="diff-line-num old old_line" data-linenumber="37" 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="LC37" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">mkStrictSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkClosedStrictSig</span><span class="p">,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="37" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">mkStrictSig<span class="idiff left right">ForArity</span></span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkClosedStrictSig</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">nopSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">botSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cprProdSig</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="39" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isTopSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hasDemandEnvSig</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitStrictSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">strictSigDmdEnv</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">@@ -47,10 +47,10 @@ module Demand (</td>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">deferAfterIO</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">postProcessUnsat</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">postProcessDmdType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC50" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitProdDmd_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">peelCallDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">peelManyCalls</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCallDmd</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitProdDmd_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">peelCallDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">peelManyCalls</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCallDmd</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">mkCallDmds</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkWorkerDemand</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dmdTransformSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dmdTransformDataConSig</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">dmdTransformDictSelSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">argOneShots</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">argsOneShots</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">saturatedByOneShots</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC53" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">trimToType</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TypeShape</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff right">)</span>,</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TypeShape</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">peelTsFuns</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">trimToType</span></span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">useCount</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isUsedOnce</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">reuseEnv</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">killUsageDemand</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">killUsageSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zapUsageDemand</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zapUsageEnvSig</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">@@ -675,10 +675,15 @@ mkProdDmd dx</td>
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<pre style="margin: 0;"> <span id="LC675" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">JD</span> <span class="p">{</span> <span class="n" style="color: #333;">sd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSProd</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">getStrDmd</span> <span class="n" style="color: #333;">dx</span></span>
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<pre style="margin: 0;"> <span id="LC676" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkUProd</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">getUseDmd</span> <span class="n" style="color: #333;">dx</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC677" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC678" class="line" lang="haskell"><span class="cd">-- | Wraps the 'CleanDemand' with a one-shot call demand: @d@ -> @C1(d)@.</span></span>
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<pre style="margin: 0;"> <span id="LC679" class="line" lang="haskell"><span class="n" style="color: #333;">mkCallDmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CleanDemand</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CleanDemand</span></span>
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<pre style="margin: 0;"> <span id="LC680" class="line" lang="haskell"><span class="n" style="color: #333;">mkCallDmd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">JD</span> <span class="p">{</span><span class="n" style="color: #333;">sd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">d</span><span class="p">,</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">u</span><span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC681" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">JD</span> <span class="p">{</span> <span class="n" style="color: #333;">sd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSCall</span> <span class="n" style="color: #333;">d</span><span class="p">,</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkUCall</span> <span class="kt" style="color: #458; font-weight: 600;">One</span> <span class="n" style="color: #333;">u</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC682" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC683" class="line" lang="haskell"><span class="cd">-- | @mkCallDmds n d@ returns @C1(C1...(C1 d))@ where there are @n@ @C1@'s.</span></span>
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"><span class="n" style="color: #333;">mkCallDmds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CleanDemand</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CleanDemand</span></span>
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<pre style="margin: 0;">+<span id="LC685" class="line" lang="haskell"><span class="n" style="color: #333;">mkCallDmds</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">cd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">iterate</span> <span class="n" style="color: #333;">mkCallDmd</span> <span class="n" style="color: #333;">cd</span> <span class="o" style="font-weight: 600;">!!</span> <span class="n" style="color: #333;">arity</span></span>
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<pre style="margin: 0;">+<span id="LC686" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Demand on the worker] in WorkWrap</span></span>
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="haskell"><span class="n" style="color: #333;">mkWorkerDemand</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span></span>
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="haskell"><span class="n" style="color: #333;">mkWorkerDemand</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">JD</span> <span class="p">{</span> <span class="n" style="color: #333;">sd</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Lazy</span><span class="p">,</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Use</span> <span class="kt" style="color: #458; font-weight: 600;">One</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</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">@@ -804,6 +809,13 @@ instance Outputable TypeShape where</td>
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<pre style="margin: 0;"> <span id="LC809" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TsFun</span> <span class="n" style="color: #333;">ts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"TsFun"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ts</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC810" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TsProd</span> <span class="n" style="color: #333;">tss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">hsep</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tss</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC811" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC812" class="line" lang="haskell"><span class="cd">-- | @peelTsFuns n ts@ tries to peel off @n@ 'TsFun' constructors from @ts@ and</span></span>
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<pre style="margin: 0;">+<span id="LC813" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returns 'Just' the wrapped 'TypeShape' on success, and 'Nothing' otherwise.</span></span>
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<pre style="margin: 0;">+<span id="LC814" class="line" lang="haskell"><span class="n" style="color: #333;">peelTsFuns</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TypeShape</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TypeShape</span></span>
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<pre style="margin: 0;">+<span id="LC815" class="line" lang="haskell"><span class="n" style="color: #333;">peelTsFuns</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">ts</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ts</span></span>
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<pre style="margin: 0;">+<span id="LC816" class="line" lang="haskell"><span class="n" style="color: #333;">peelTsFuns</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TsFun</span> <span class="n" style="color: #333;">ts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">peelTsFuns</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">ts</span></span>
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<pre style="margin: 0;">+<span id="LC817" class="line" lang="haskell"><span class="n" style="color: #333;">peelTsFuns</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC818" class="line" lang="haskell"></span>
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819
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<pre style="margin: 0;"> <span id="LC819" class="line" lang="haskell"><span class="n" style="color: #333;">trimToType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TypeShape</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span></span>
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808
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820
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<pre style="margin: 0;"> <span id="LC820" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Trimming a demand to a type]</span></span>
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809
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821
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<pre style="margin: 0;"> <span id="LC821" class="line" lang="haskell"><span class="n" style="color: #333;">trimToType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">JD</span> <span class="p">{</span> <span class="n" style="color: #333;">sd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ms</span><span class="p">,</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mu</span> <span class="p">})</span> <span class="n" style="color: #333;">ts</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">@@ -1207,12 +1219,8 @@ mkDmdType fv ds res = DmdType fv ds res</td>
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1207
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1219
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<pre style="margin: 0;"> <span id="LC1219" class="line" lang="haskell"><span class="n" style="color: #333;">dmdTypeDepth</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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1208
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1220
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<pre style="margin: 0;"> <span id="LC1220" class="line" lang="haskell"><span class="n" style="color: #333;">dmdTypeDepth</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ds</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;">length</span> <span class="n" style="color: #333;">ds</span></span>
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1209
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1221
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<pre style="margin: 0;"> <span id="LC1221" class="line" lang="haskell"></span>
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1210
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<pre style="margin: 0;">-<span id="LC1210" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Remove any demand on arguments. This is used in dmdAnalRhs on the body</span></span>
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1211
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<pre style="margin: 0;">-<span id="LC1211" class="line" lang="haskell"><span class="n" style="color: #333;">removeDmdTyArgs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span></span>
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1212
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<pre style="margin: 0;">-<span id="LC1212" class="line" lang="haskell"><span class="n" style="color: #333;">removeDmdTyArgs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ensureArgs</span> <span class="mi" style="color: #099;">0</span></span>
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1213
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<pre style="margin: 0;">-<span id="LC1213" class="line" lang="haskell"></span>
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1214
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<pre style="margin: 0;">-<span id="LC1214" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This makes sure we can use the demand type with n arguments,</span></span>
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1215
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<pre style="margin: 0;">-<span id="LC1215" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It extends the argument list with the correct resTypeArgDmd</span></span>
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<pre style="margin: 0;">+<span id="LC1222" class="line" lang="haskell"><span class="cd">-- | This makes sure we can use the demand type with n arguments.</span></span>
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<pre style="margin: 0;">+<span id="LC1223" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It extends the argument list with the correct resTypeArgDmd.</span></span>
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<pre style="margin: 0;"> <span id="LC1224" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It also adjusts the DmdResult: Divergence survives additional arguments,</span></span>
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<pre style="margin: 0;"> <span id="LC1225" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- CPR information does not (and definite converge also would not).</span></span>
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<pre style="margin: 0;"> <span id="LC1226" class="line" lang="haskell"><span class="n" style="color: #333;">ensureArgs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</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">@@ -1567,8 +1575,56 @@ and <L,U(U,U)> on the second, then returning a constructor.</td>
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<pre style="margin: 0;"> <span id="LC1575" class="line" lang="haskell"></span>
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1576
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<pre style="margin: 0;"> <span id="LC1576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If this same function is applied to one arg, all we can say is that it</span></span>
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1569
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1577
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<pre style="margin: 0;"> <span id="LC1577" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">uses x with <L,U>, and its arg with demand <L,U>.</span></span>
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1578
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<pre style="margin: 0;">+<span id="LC1578" class="line" lang="haskell"></span>
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1579
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<pre style="margin: 0;">+<span id="LC1579" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Understanding DmdType and StrictSig]</span></span>
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1580
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<pre style="margin: 0;">+<span id="LC1580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1581
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<pre style="margin: 0;">+<span id="LC1581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Demand types are sound approximations of an expression's semantics relative to</span></span>
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1582
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<pre style="margin: 0;">+<span id="LC1582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the incoming demand we put the expression under. Consider the following</span></span>
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1583
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<pre style="margin: 0;">+<span id="LC1583" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expression:</span></span>
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1584
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<pre style="margin: 0;">+<span id="LC1584" class="line" lang="haskell"></span>
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1585
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<pre style="margin: 0;">+<span id="LC1585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> \x y -> x `seq` (y, 2*x)</span></span>
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1586
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<pre style="margin: 0;">+<span id="LC1586" class="line" lang="haskell"></span>
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1587
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<pre style="margin: 0;">+<span id="LC1587" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here is a table with demand types resulting from different incoming demands we</span></span>
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1588
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<pre style="margin: 0;">+<span id="LC1588" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">put that expression under. Note the monotonicity; a stronger incoming demand</span></span>
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1589
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<pre style="margin: 0;">+<span id="LC1589" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">yields a more precise demand type:</span></span>
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1590
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<pre style="margin: 0;">+<span id="LC1590" class="line" lang="haskell"></span>
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1591
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<pre style="margin: 0;">+<span id="LC1591" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> incoming demand | demand type</span></span>
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<pre style="margin: 0;">+<span id="LC1592" 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="LC1593" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <S ,HU > | <L,U><L,U>{}</span></span>
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<pre style="margin: 0;">+<span id="LC1594" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <C(C(S )),C1(C1(U ))> | <S,U><L,U>{}</span></span>
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<pre style="margin: 0;">+<span id="LC1595" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <C(C(S(S,L))),C1(C1(U(1*U,A)))> | <S,1*HU><S,1*U>{}</span></span>
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<pre style="margin: 0;">+<span id="LC1596" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that in the first example, the depth of the demand type was *higher* than</span></span>
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<pre style="margin: 0;">+<span id="LC1598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the arity of the incoming call demand due to the anonymous lambda.</span></span>
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<pre style="margin: 0;">+<span id="LC1599" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The converse is also possible and happens when we unleash demand signatures.</span></span>
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<pre style="margin: 0;">+<span id="LC1600" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In @f x y@, the incoming call demand on f has arity 2. But if all we have is a</span></span>
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<pre style="margin: 0;">+<span id="LC1601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">demand signature with depth 1 for @f@ (which we can safely unleash, see below),</span></span>
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<pre style="margin: 0;">+<span id="LC1602" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the demand type of @f@ under a call demand of arity 2 has a *lower* depth of 1.</span></span>
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<pre style="margin: 0;">+<span id="LC1603" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So: Demand types are elicited by putting an expression under an incoming (call)</span></span>
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<pre style="margin: 0;">+<span id="LC1605" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">demand, the arity of which can be lower or higher than the depth of the</span></span>
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<pre style="margin: 0;">+<span id="LC1606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">resulting demand type.</span></span>
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<pre style="margin: 0;">+<span id="LC1607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In contrast, a demand signature summarises a function's semantics *without*</span></span>
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<pre style="margin: 0;">+<span id="LC1608" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">immediately specifying the incoming demand it was produced under. Despite StrSig</span></span>
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<pre style="margin: 0;">+<span id="LC1609" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">being a newtype wrapper around DmdType, it actually encodes two things:</span></span>
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<pre style="margin: 0;">+<span id="LC1610" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1611" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * The threshold (i.e., minimum arity) to unleash the signature</span></span>
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<pre style="margin: 0;">+<span id="LC1612" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * A demand type that is sound to unleash when the minimum arity requirement is</span></span>
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<pre style="margin: 0;">+<span id="LC1613" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> met.</span></span>
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<pre style="margin: 0;">+<span id="LC1614" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1615" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here comes the subtle part: The threshold is encoded in the wrapped demand</span></span>
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<pre style="margin: 0;">+<span id="LC1616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type's depth! So in mkStrictSigForArity we make sure to trim the list of</span></span>
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<pre style="margin: 0;">+<span id="LC1617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">argument demands to the given threshold arity. Call sites will make sure that</span></span>
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<pre style="margin: 0;">+<span id="LC1618" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">this corresponds to the arity of the call demand that elicited the wrapped</span></span>
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<pre style="margin: 0;">+<span id="LC1619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">demand type. See also Note [What are demand signatures?] in DmdAnal.</span></span>
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<pre style="margin: 0;">+<span id="LC1620" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Besides trimming argument demands, mkStrictSigForArity will also trim CPR</span></span>
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<pre style="margin: 0;">+<span id="LC1622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">information if necessary.</span></span>
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<pre style="margin: 0;"> <span id="LC1623" 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="LC1624" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1625" class="line" lang="haskell"><span class="cd">-- | The depth of the wrapped 'DmdType' encodes the arity at which it is safe</span></span>
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<pre style="margin: 0;">+<span id="LC1626" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to unleash. Better construct this through 'mkStrictSigForArity'.</span></span>
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<pre style="margin: 0;">+<span id="LC1627" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Understanding DmdType and StrictSig]</span></span>
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1628
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<pre style="margin: 0;"> <span id="LC1628" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span></span>
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1573
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1629
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<pre style="margin: 0;"> <span id="LC1629" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="p">)</span></span>
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1630
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<pre style="margin: 0;"> <span id="LC1630" 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">@@ -1580,34 +1636,43 @@ pprIfaceStrictSig :: StrictSig -> SDoc</td>
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<pre style="margin: 0;"> <span id="LC1636" class="line" lang="haskell"><span class="n" style="color: #333;">pprIfaceStrictSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">dmds</span> <span class="n" style="color: #333;">res</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC1637" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">dmds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">res</span></span>
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<pre style="margin: 0;"> <span id="LC1638" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1583" class="line" lang="haskell"><span class="n" style="color: #333;">mkStrictSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span></span>
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<pre style="margin: 0;">-<span id="LC1584" class="line" lang="haskell"><span class="n" style="color: #333;">mkStrictSig</span> <span class="n" style="color: #333;">dmd_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="n" style="color: #333;">dmd_ty</span></span>
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<pre style="margin: 0;">+<span id="LC1639" class="line" lang="haskell"><span class="cd">-- | Turns a 'DmdType' computed for the particular 'Arity' into a 'StrictSig'</span></span>
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<pre style="margin: 0;">+<span id="LC1640" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- unleashable at that arity. See Note [Understanding DmdType and StrictSig]</span></span>
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1641
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<pre style="margin: 0;">+<span id="LC1641" class="line" lang="haskell"><span class="n" style="color: #333;">mkStrictSigForArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span></span>
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<pre style="margin: 0;">+<span id="LC1642" class="line" lang="haskell"><span class="n" style="color: #333;">mkStrictSigForArity</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">dmd_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="p">(</span><span class="n" style="color: #333;">ensureArgs</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">dmd_ty</span><span class="p">)</span></span>
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1643
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<pre style="margin: 0;"> <span id="LC1643" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1644" class="line" lang="haskell"><span class="n" style="color: #333;">mkClosedStrictSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Demand</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdResult</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span></span>
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1587
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<pre style="margin: 0;">-<span id="LC1587" class="line" lang="haskell"><span class="n" style="color: #333;">mkClosedStrictSig</span> <span class="n" style="color: #333;">ds</span> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkStrictSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">emptyDmdEnv</span> <span class="n" style="color: #333;">ds</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1645" class="line" lang="haskell"><span class="n" style="color: #333;">mkClosedStrictSig</span> <span class="n" style="color: #333;">ds</span> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkStrictSig<span class="idiff left">ForArity</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">length</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ds</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">emptyDmdEnv</span> <span class="n" style="color: #333;">ds</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1646" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1647" class="line" lang="haskell"><span class="n" style="color: #333;">splitStrictSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Demand</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">DmdResult</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1648" class="line" lang="haskell"><span class="n" style="color: #333;">splitStrictSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">dmds</span> <span class="n" style="color: #333;">res</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">dmds</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1649" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1650" class="line" lang="haskell"><span class="n" style="color: #333;">increaseStrictSigArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span></span>
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<pre style="margin: 0;">-<span id="LC1593" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Add extra arguments to a strictness signature</span></span>
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<pre style="margin: 0;">+<span id="LC1651" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Add extra arguments to a strictness signature.</span></span>
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<pre style="margin: 0;">+<span id="LC1652" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In contrast to 'etaExpandStrictSig', this /prepends/ additional argument</span></span>
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<pre style="margin: 0;">+<span id="LC1653" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- demands and leaves CPR info intact.</span></span>
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<pre style="margin: 0;"> <span id="LC1654" class="line" lang="haskell"><span class="n" style="color: #333;">increaseStrictSigArity</span> <span class="n" style="color: #333;">arity_increase</span> <span class="n" style="color: #333;">sig</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="n" style="color: #333;">dmd_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dmds</span> <span class="n" style="color: #333;">res</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC1655" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTopDmdType</span> <span class="n" style="color: #333;">dmd_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;">-<span id="LC1596" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">arity_increase</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;">+<span id="LC1656" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">arity_increase</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;">+<span id="LC1657" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">arity_increase</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</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;">"increaseStrictSigArity:"</span></span>
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<pre style="margin: 0;">+<span id="LC1658" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"negative arity increase"</span></span>
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<pre style="margin: 0;">+<span id="LC1659" 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;">arity_increase</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1660" class="line" lang="haskell"> <span class="n" style="color: #333;">nopSig</span></span>
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1661
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<pre style="margin: 0;"> <span id="LC1661" 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;">StrictSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dmds'</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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1598
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1662
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<pre style="margin: 0;"> <span id="LC1662" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1599
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<pre style="margin: 0;"> <span id="LC1663" class="line" lang="haskell"> <span class="n" style="color: #333;">dmds'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">arity_increase</span> <span class="n" style="color: #333;">topDmd</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">dmds</span></span>
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1600
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1664
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<pre style="margin: 0;"> <span id="LC1664" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1665" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpandStrictSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span></span>
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1602
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<pre style="margin: 0;">-<span id="LC1602" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We are expanding (\x y. e) to (\x y z. e z)</span></span>
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1603
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<pre style="margin: 0;">-<span id="LC1603" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Add exta demands to the /end/ of the arg demands if necessary</span></span>
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1604
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<pre style="margin: 0;">-<span id="LC1604" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpandStrictSig</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">sig</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="n" style="color: #333;">dmd_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dmds</span> <span class="n" style="color: #333;">res</span><span class="p">))</span></span>
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1605
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<pre style="margin: 0;">-<span id="LC1605" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTopDmdType</span> <span class="n" style="color: #333;">dmd_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig</span></span>
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1606
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<pre style="margin: 0;">-<span id="LC1606" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">arity_increase</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig</span></span>
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1607
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<pre style="margin: 0;">-<span id="LC1607" 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;">StrictSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dmds'</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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1608
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<pre style="margin: 0;">-<span id="LC1608" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1609
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<pre style="margin: 0;">-<span id="LC1609" class="line" lang="haskell"> <span class="n" style="color: #333;">arity_increase</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">dmds</span></span>
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1610
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<pre style="margin: 0;">-<span id="LC1610" class="line" lang="haskell"> <span class="n" style="color: #333;">dmds'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmds</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">arity_increase</span> <span class="n" style="color: #333;">topDmd</span></span>
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1666
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<pre style="margin: 0;">+<span id="LC1666" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ We are expanding (\x y. e) to (\x y z. e z).</span></span>
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<pre style="margin: 0;">+<span id="LC1667" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In contrast to 'increaseStrictSigArity', this /appends/ extra arg demands if</span></span>
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1668
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<pre style="margin: 0;">+<span id="LC1668" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- necessary, potentially destroying the signature's CPR property.</span></span>
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1669
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<pre style="margin: 0;">+<span id="LC1669" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpandStrictSig</span> <span class="n" style="color: #333;">arity</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="n" style="color: #333;">dmd_ty</span><span class="p">)</span></span>
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1670
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<pre style="margin: 0;">+<span id="LC1670" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">dmdTypeDepth</span> <span class="n" style="color: #333;">dmd_ty</span></span>
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1671
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<pre style="margin: 0;">+<span id="LC1671" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- an arity decrease must zap the whole signature, because it was possibly</span></span>
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1672
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<pre style="margin: 0;">+<span id="LC1672" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- computed for a higher incoming call demand.</span></span>
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1673
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<pre style="margin: 0;">+<span id="LC1673" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nopSig</span></span>
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1674
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<pre style="margin: 0;">+<span id="LC1674" 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="LC1675" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ensureArgs</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">dmd_ty</span></span>
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<pre style="margin: 0;"> <span id="LC1676" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1677" class="line" lang="haskell"><span class="n" style="color: #333;">isTopSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC1678" class="line" lang="haskell"><span class="n" style="color: #333;">isTopSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTopDmdType</span> <span class="n" style="color: #333;">ty</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#2c842f2f15e67826dc12cc363525b56acb7b7882"><strong>compiler/basicTypes/Id.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">@@ -668,6 +668,7 @@ isBottomingId v</td>
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<pre style="margin: 0;"> <span id="LC668" 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;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isBottomingSig</span> <span class="p">(</span><span class="n" style="color: #333;">idStrictness</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC669" 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;">False</span></span>
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<pre style="margin: 0;"> <span id="LC670" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC671" class="line" lang="haskell"><span class="cd">-- | Accesses the 'Id''s 'strictnessInfo'.</span></span>
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<pre style="margin: 0;"> <span id="LC672" class="line" lang="haskell"><span class="n" style="color: #333;">idStrictness</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;">StrictSig</span></span>
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<pre style="margin: 0;"> <span id="LC673" class="line" lang="haskell"><span class="n" style="color: #333;">idStrictness</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">strictnessInfo</span> <span class="p">(</span><span class="n" style="color: #333;">idInfo</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC674" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#6f7593803995899e68e1b976dcde5817ec0f2342"><strong>compiler/basicTypes/IdInfo.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">@@ -237,22 +237,34 @@ pprIdDetails other = brackets (pp other)</td>
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<pre style="margin: 0;"> <span id="LC237" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- too big.</span></span>
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<pre style="margin: 0;"> <span id="LC238" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">IdInfo</span></span>
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IdInfo</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC240" class="line" lang="haskell"> <span class="n" style="color: #333;">arityInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">ArityInfo</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ 'Id' arity</span></span>
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<pre style="margin: 0;">-<span id="LC241" class="line" lang="haskell"> <span class="n" style="color: #333;">ruleInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RuleInfo</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Specialisations of the 'Id's function which exist</span></span>
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<pre style="margin: 0;">-<span id="LC242" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Specialisations and RULES in IdInfo]</span></span>
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<pre style="margin: 0;">-<span id="LC243" class="line" lang="haskell"> <span class="n" style="color: #333;">unfoldingInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The 'Id's unfolding</span></span>
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<pre style="margin: 0;">-<span id="LC244" class="line" lang="haskell"> <span class="n" style="color: #333;">cafInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CafInfo</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ 'Id' CAF info</span></span>
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<pre style="margin: 0;">-<span id="LC245" class="line" lang="haskell"> <span class="n" style="color: #333;">oneShotInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OneShotInfo</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Info about a lambda-bound variable, if the 'Id' is one</span></span>
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<pre style="margin: 0;">-<span id="LC246" class="line" lang="haskell"> <span class="n" style="color: #333;">inlinePragInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InlinePragma</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Any inline pragma atached to the 'Id'</span></span>
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<pre style="margin: 0;">-<span id="LC247" class="line" lang="haskell"> <span class="n" style="color: #333;">occInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccInfo</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ How the 'Id' occurs in the program</span></span>
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<pre style="margin: 0;">-<span id="LC248" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC249" class="line" lang="haskell"> <span class="n" style="color: #333;">strictnessInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ A strictness signature</span></span>
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<pre style="margin: 0;">-<span id="LC250" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC251" class="line" lang="haskell"> <span class="n" style="color: #333;">demandInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ ID demand information</span></span>
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<pre style="margin: 0;">-<span id="LC252" class="line" lang="haskell"> <span class="n" style="color: #333;">callArityInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">ArityInfo</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ How this is called.</span></span>
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<pre style="margin: 0;">-<span id="LC253" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- n <=> all calls have at least n arguments</span></span>
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<pre style="margin: 0;">-<span id="LC254" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC255" class="line" lang="haskell"> <span class="n" style="color: #333;">levityInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LevityInfo</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ when applied, will this Id ever have a levity-polymorphic type?</span></span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell"> <span class="n" style="color: #333;">arityInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">ArityInfo</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ 'Id' arity, as computed by 'CoreArity'. Specifies how many</span></span>
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- arguments this 'Id' has to be applied to before it doesn any</span></span>
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<pre style="margin: 0;">+<span id="LC243" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- meaningful work.</span></span>
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<pre style="margin: 0;">+<span id="LC244" class="line" lang="haskell"> <span class="n" style="color: #333;">ruleInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RuleInfo</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC245" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Specialisations of the 'Id's function which exist.</span></span>
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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 [Specialisations and RULES in IdInfo]</span></span>
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<pre style="margin: 0;">+<span id="LC247" class="line" lang="haskell"> <span class="n" style="color: #333;">unfoldingInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC248" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The 'Id's unfolding</span></span>
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<pre style="margin: 0;">+<span id="LC249" class="line" lang="haskell"> <span class="n" style="color: #333;">cafInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CafInfo</span><span class="p">,</span></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;">-- ^ 'Id' CAF info</span></span>
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<pre style="margin: 0;">+<span id="LC251" class="line" lang="haskell"> <span class="n" style="color: #333;">oneShotInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OneShotInfo</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC252" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Info about a lambda-bound variable, if the 'Id' is one</span></span>
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"> <span class="n" style="color: #333;">inlinePragInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InlinePragma</span><span class="p">,</span></span>
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254
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<pre style="margin: 0;">+<span id="LC254" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Any inline pragma atached to the 'Id'</span></span>
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<pre style="margin: 0;">+<span id="LC255" class="line" lang="haskell"> <span class="n" style="color: #333;">occInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccInfo</span><span class="p">,</span></span>
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256
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<pre style="margin: 0;">+<span id="LC256" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ How the 'Id' occurs in the program</span></span>
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<pre style="margin: 0;">+<span id="LC257" class="line" lang="haskell"> <span class="n" style="color: #333;">strictnessInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A strictness signature. Digests how a function uses its arguments</span></span>
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<pre style="margin: 0;">+<span id="LC259" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if applied to at least 'arityInfo' arguments.</span></span>
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<pre style="margin: 0;">+<span id="LC260" class="line" lang="haskell"> <span class="n" style="color: #333;">demandInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ ID demand information</span></span>
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"> <span class="n" style="color: #333;">callArityInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">ArityInfo</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ How this is called. This is the number of arguments to which a</span></span>
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- binding can be eta-expanded without losing any sharing.</span></span>
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- n <=> all calls have at least n arguments</span></span>
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="haskell"> <span class="n" style="color: #333;">levityInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LevityInfo</span></span>
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ when applied, will this Id ever have a levity-polymorphic type?</span></span>
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Setters</span></span>
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<li id="75c960e63e855ede311c1cf6d407b2bf0b742333">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#75c960e63e855ede311c1cf6d407b2bf0b742333"><strong>compiler/basicTypes/Var.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">@@ -700,6 +700,8 @@ setIdNotExported id = ASSERT( isLocalId id )</td>
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700
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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701
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<pre style="margin: 0;"> <span id="LC701" 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="LC702" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC703" class="line" lang="haskell"><span class="cd">-- | Is this a type-level (i.e., computationally irrelevant, thus erasable)</span></span>
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<pre style="margin: 0;">+<span id="LC704" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variable? Satisfies @isTyVar = not . isId@.</span></span>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"><span class="n" style="color: #333;">isTyVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True of both TyVar and TcTyVar</span></span>
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"><span class="n" style="color: #333;">isTyVar</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"><span class="n" style="color: #333;">isTyVar</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</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">@@ -712,17 +714,21 @@ isTcTyVar _ = False</td>
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="haskell"><span class="n" style="color: #333;">isTyCoVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC715" class="line" lang="haskell"><span class="n" style="color: #333;">isTyCoVar</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isCoVar</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC716" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"><span class="cd">-- | Is this a value-level (i.e., computationally relevant) 'Id'entifier?</span></span>
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Satisfies @isId = not . isTyVar@.</span></span>
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<pre style="margin: 0;"> <span id="LC719" class="line" lang="haskell"><span class="n" style="color: #333;">isId</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC720" class="line" lang="haskell"><span class="n" style="color: #333;">isId</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC721" class="line" lang="haskell"><span class="n" style="color: #333;">isId</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC722" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC723" class="line" lang="haskell"><span class="cd">-- | Is this a coercion variable?</span></span>
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<pre style="margin: 0;">+<span id="LC724" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Satisfies @'isId' v ==> 'isCoVar' v == not ('isNonCoVarId' v)@.</span></span>
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<pre style="margin: 0;"> <span id="LC725" class="line" lang="haskell"><span class="n" style="color: #333;">isCoVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC720" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- A coercion variable</span></span>
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<pre style="margin: 0;"> <span id="LC726" class="line" lang="haskell"><span class="n" style="color: #333;">isCoVar</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="p">{</span> <span class="n" style="color: #333;">id_details</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">details</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isCoVarDetails</span> <span class="n" style="color: #333;">details</span></span>
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<pre style="margin: 0;"> <span id="LC727" class="line" lang="haskell"><span class="n" style="color: #333;">isCoVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC728" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC729" class="line" lang="haskell"><span class="cd">-- | Is this a term variable ('Id') that is /not/ a coercion variable?</span></span>
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<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Satisfies @'isId' v ==> 'isCoVar' v == not ('isNonCoVarId' v)@.</span></span>
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<pre style="margin: 0;"> <span id="LC731" class="line" lang="haskell"><span class="n" style="color: #333;">isNonCoVarId</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC725" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- A term variable (Id) that is /not/ a coercion variable</span></span>
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<pre style="margin: 0;"> <span id="LC732" class="line" lang="haskell"><span class="n" style="color: #333;">isNonCoVarId</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="p">{</span> <span class="n" style="color: #333;">id_details</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">details</span> <span class="p">})</span> <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;">isCoVarDetails</span> <span class="n" style="color: #333;">details</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC733" class="line" lang="haskell"><span class="n" style="color: #333;">isNonCoVarId</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC734" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#ed7e37ad33aa047f1f6bc74d375c38e6484b231c"><strong>compiler/coreSyn/CoreArity.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">@@ -158,7 +158,7 @@ exprBotStrictness_maybe e</td>
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<pre style="margin: 0;"> <span id="LC158" 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="LC159" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [exprArity invariant]</span></span>
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<pre style="margin: 0;"> <span id="LC160" 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="LC161" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">exprArity has the following invariant:</span></span>
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">exprArity has the following invariant<span class="idiff left right">s</span>:</span></span>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (1) If typeArity (exprType e) = n,</span></span>
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then manifestArity (etaExpand e n) = n</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#da5742c4b404a672740f0eef71683f5a8dd3818e"><strong>compiler/coreSyn/CoreLint.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">@@ -570,15 +570,9 @@ lintSingleBinding top_lvl_flag rec_flag (binder,rhs)</td>
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">addWarnL</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"INLINE binder is (non-rule) loop breaker:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">binder</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC571" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Only non-rule loop breakers inhibit inlining</span></span>
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC573" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check whether arity and demand type are consistent (only if demand analysis</span></span>
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<pre style="margin: 0;">-<span id="LC574" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- already happened)</span></span>
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<pre style="margin: 0;">-<span id="LC575" 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="LC576" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note (Apr 2014): this is actually ok. See Note [Demand analysis for trivial right-hand sides]</span></span>
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577
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<pre style="margin: 0;">-<span id="LC577" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in DmdAnal. After eta-expansion in CorePrep the rhs is no longer trivial.</span></span>
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578
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<pre style="margin: 0;">-<span id="LC578" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ; let dmdTy = idStrictness binder</span></span>
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<pre style="margin: 0;">-<span id="LC579" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ; checkL (case dmdTy of</span></span>
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<pre style="margin: 0;">-<span id="LC580" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- StrictSig dmd_ty -> idArity binder >= dmdTypeDepth dmd_ty || exprIsTrivial rhs)</span></span>
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<pre style="margin: 0;">-<span id="LC581" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (mkArityMsg binder)</span></span>
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<pre style="margin: 0;">+<span id="LC573" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We used to check that the dmdTypeDepth of a demand signature never</span></span>
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<pre style="margin: 0;">+<span id="LC574" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- exceeds idArity, but that is an unnecessary complication, see</span></span>
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<pre style="margin: 0;">+<span id="LC575" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [idArity varies independently of dmdTypeDepth] in DmdAnal</span></span>
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that the binder's arity is within the bounds imposed by</span></span>
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the type and the strictness signature. See Note [exprArity invariant]</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">@@ -2565,20 +2559,6 @@ mkKindErrMsg tyvar arg_ty</td>
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<pre style="margin: 0;"> <span id="LC2559" class="line" lang="haskell"> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Arg type:"</span><span class="p">)</span></span>
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2566
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2560
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<pre style="margin: 0;"> <span id="LC2560" class="line" lang="haskell"> <span class="mi" style="color: #099;">4</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg_ty</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">))]</span></span>
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2567
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2561
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<pre style="margin: 0;"> <span id="LC2561" class="line" lang="haskell"></span>
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2568
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<pre style="margin: 0;">-<span id="LC2568" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Not needed now</span></span>
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2569
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<pre style="margin: 0;">-<span id="LC2569" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">mkArityMsg :: Id -> MsgDoc</span></span>
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2570
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<pre style="margin: 0;">-<span id="LC2570" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">mkArityMsg binder</span></span>
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2571
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<pre style="margin: 0;">-<span id="LC2571" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = vcat [hsep [text "Demand type has",</span></span>
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2572
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<pre style="margin: 0;">-<span id="LC2572" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ppr (dmdTypeDepth dmd_ty),</span></span>
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2573
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<pre style="margin: 0;">-<span id="LC2573" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> text "arguments, rhs has",</span></span>
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<pre style="margin: 0;">-<span id="LC2574" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ppr (idArity binder),</span></span>
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<pre style="margin: 0;">-<span id="LC2575" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> text "arguments,",</span></span>
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<pre style="margin: 0;">-<span id="LC2576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ppr binder],</span></span>
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<pre style="margin: 0;">-<span id="LC2577" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> hsep [text "Binder's strictness signature:", ppr dmd_ty]</span></span>
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<pre style="margin: 0;">-<span id="LC2578" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2579" 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="LC2580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where (StrictSig dmd_ty) = idStrictness binder</span></span>
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<pre style="margin: 0;">-<span id="LC2581" 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="LC2562" class="line" lang="haskell"><span class="n" style="color: #333;">mkCastErr</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;">Coercion</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 class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MsgDoc</span></span>
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2563
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<pre style="margin: 0;"> <span id="LC2563" class="line" lang="haskell"><span class="n" style="color: #333;">mkCastErr</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mk_cast_err</span> <span class="s" style="color: #d14;">"expression"</span> <span class="s" style="color: #d14;">"type"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2564" 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">@@ -1149,15 +1149,15 @@ certainlyWillInline dflags fn_info</td>
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<pre style="margin: 0;"> <span id="LC1149" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- INLINABLE functions come via this path</span></span>
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<pre style="margin: 0;"> <span id="LC1150" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [certainlyWillInline: INLINABLE]</span></span>
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1151
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<pre style="margin: 0;"> <span id="LC1151" class="line" lang="haskell"> <span class="n" style="color: #333;">do_cunf</span> <span class="n" style="color: #333;">expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UnfIfGoodArgs</span> <span class="p">{</span> <span class="n" style="color: #333;">ug_size</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">size</span><span class="p">,</span> <span class="n" style="color: #333;">ug_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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1152
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<pre style="margin: 0;">-<span id="LC1152" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">not</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">null</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="p"><span class="idiff right">)</span></span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [certainlyWillInline: be careful of thunks]</span></span>
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<pre style="margin: 0;">+<span id="LC1152" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">arityInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fn_info</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">></span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff right">0</span></span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [certainlyWillInline: be careful of thunks]</span></span>
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1153
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<pre style="margin: 0;"> <span id="LC1153" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isBottomingSig</span> <span class="p">(</span><span class="n" style="color: #333;">strictnessInfo</span> <span class="n" style="color: #333;">fn_info</span><span class="p">))</span></span>
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1154
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1154
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<pre style="margin: 0;"> <span id="LC1154" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do not unconditionally inline a bottoming functions even if</span></span>
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1155
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1155
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<pre style="margin: 0;"> <span id="LC1155" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- it seems smallish. We've carefully lifted it out to top level,</span></span>
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1156
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1156
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<pre style="margin: 0;"> <span id="LC1156" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so we don't want to re-inline it.</span></span>
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<pre style="margin: 0;">-<span id="LC1157" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">args</span></span>
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1158
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<pre style="margin: 0;">-<span id="LC1158" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;">-</span> <span class="p">(</span><span class="mi" style="color: #099;">10</span> <span class="o" style="font-weight: 600;">*</span> <span class="p">(</span><span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><=</span> <span class="n" style="color: #333;">ufUseThreshold</span> <span class="n" style="color: #333;">dflags</span></span>
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1157
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<pre style="margin: 0;">+<span id="LC1157" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;"><span class="idiff left right">unf_</span>arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">args</span></span>
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1158
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<pre style="margin: 0;">+<span id="LC1158" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;">-</span> <span class="p">(</span><span class="mi" style="color: #099;">10</span> <span class="o" style="font-weight: 600;">*</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">unf_</span>arity</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><=</span> <span class="n" style="color: #333;">ufUseThreshold</span> <span class="n" style="color: #333;">dflags</span></span>
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1159
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1159
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<pre style="margin: 0;"> <span id="LC1159" 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;">fn_unf</span> <span class="p">{</span> <span class="n" style="color: #333;">uf_src</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">InlineStable</span></span>
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1160
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<pre style="margin: 0;">-<span id="LC1160" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">uf_guidance</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UnfWhen</span> <span class="p">{</span> <span class="n" style="color: #333;">ug_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arity</span></span>
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1160
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<pre style="margin: 0;">+<span id="LC1160" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">uf_guidance</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UnfWhen</span> <span class="p">{</span> <span class="n" style="color: #333;">ug_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">unf_</span>arity</span></span>
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1161
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1161
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<pre style="margin: 0;"> <span id="LC1161" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ug_unsat_ok</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unSaturatedOk</span></span>
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1162
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<pre style="margin: 0;"> <span id="LC1162" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ug_boring_ok</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inlineBoringOk</span> <span class="n" style="color: #333;">expr</span> <span class="p">}</span> <span class="p">})</span></span>
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1163
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1163
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<pre style="margin: 0;"> <span id="LC1163" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note the "unsaturatedOk". A function like f = \ab. a</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">@@ -1175,6 +1175,17 @@ found that the WorkWrap phase thought that</td>
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1175
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<pre style="margin: 0;"> <span id="LC1175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> y = case x of F# v -> F# (v +# v)</span></span>
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1176
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1176
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<pre style="margin: 0;"> <span id="LC1176" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">was certainlyWillInline, so the addition got duplicated.</span></span>
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1177
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1177
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<pre style="margin: 0;"> <span id="LC1177" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1178" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that we check arityInfo instead of the arity of the unfolding to detect</span></span>
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<pre style="margin: 0;">+<span id="LC1179" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">this case. This is so that we don't accidentally fail to inline small partial</span></span>
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<pre style="margin: 0;">+<span id="LC1180" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">applications, like `f = g 42` (where `g` recurses into `f`) where g has arity 2</span></span>
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<pre style="margin: 0;">+<span id="LC1181" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(say). Here there is no risk of work duplication, and the RHS is tiny, so</span></span>
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<pre style="margin: 0;">+<span id="LC1182" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">certainlyWillInline should return True. But `unf_arity` is zero! However f's</span></span>
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<pre style="margin: 0;">+<span id="LC1183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">arity, gotten from `arityInfo fn_info`, is 1.</span></span>
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1184
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<pre style="margin: 0;">+<span id="LC1184" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1185" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Failing to say that `f` will inline forces W/W to generate a potentially huge</span></span>
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<pre style="margin: 0;">+<span id="LC1186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">worker for f that will immediately cancel with `g`'s wrapper anyway, causing</span></span>
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<pre style="margin: 0;">+<span id="LC1187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unnecessary churn in the Simplifier while arriving at the same result.</span></span>
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<pre style="margin: 0;">+<span id="LC1188" class="line" lang="haskell"></span>
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1189
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<pre style="margin: 0;"> <span id="LC1189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [certainlyWillInline: INLINABLE]</span></span>
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1179
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1190
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<pre style="margin: 0;"> <span id="LC1190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1180
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1191
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<pre style="margin: 0;"> <span id="LC1191" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">certainlyWillInline /must/ return Nothing for a large INLINABLE thing,</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#5d79081946c94bec01bbf2f1ece6597a963760cd"><strong>compiler/simplCore/SimplMonad.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">@@ -21,7 +21,7 @@ module SimplMonad (</td>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GhcPrelude</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Var</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">is<span class="idiff left right">TyVar</span></span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkLocalVar</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Var</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">is<span class="idiff left right">Id</span></span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkLocalVar</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Name</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">mkSystemVarName</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Id</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkSysLocalOrCoVar</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">IdInfo</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">IdDetails</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">vanillaIdInfo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setArityInfo</span> <span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="187" 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">@@ -187,7 +187,8 @@ newJoinId bndrs body_ty</td>
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187
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">uniq</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getUniqueM</span></span>
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188
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188
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSystemVarName</span> <span class="n" style="color: #333;">uniq</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"$j"</span><span class="p">)</span></span>
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189
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"> <span class="n" style="color: #333;">join_id_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLamTypes</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">body_ty</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [Funky mkLamTypes]</span></span>
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"> <span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="p">(</span><span class="n" style="color: #333;">filter</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">isTyVar</span><span class="p">)</span> <span class="n" style="color: #333;">bndrs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [idArity for join points] in SimplUtils</span></span>
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell"> <span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="p">(</span><span class="n" style="color: #333;">filter</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">bndrs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="haskell"> <span class="n" style="color: #333;">join_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="haskell"> <span class="n" style="color: #333;">details</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">JoinId</span> <span class="n" style="color: #333;">join_arity</span></span>
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="haskell"> <span class="n" style="color: #333;">id_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vanillaIdInfo</span> <span class="p">`</span><span class="n" style="color: #333;">setArityInfo</span><span class="p">`</span> <span class="n" style="color: #333;">arity</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#32d53a69dcadfb969898a49221a1ff152ea0677a"><strong>compiler/simplCore/SimplUtils.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">@@ -1508,7 +1508,7 @@ tryEtaExpandRhs :: SimplMode -> OutId -> OutExpr</td>
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<pre style="margin: 0;"> <span id="LC1508" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SimplM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Arity</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">OutExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1509" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Eta-expanding at let bindings]</span></span>
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<pre style="margin: 0;"> <span id="LC1510" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If tryEtaExpandRhs rhs = (n, is_bot, rhs') then</span></span>
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<pre style="margin: 0;">-<span id="LC1511" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (a) rhs' has manifest arity</span></span>
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<pre style="margin: 0;">+<span id="LC1511" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (a) rhs' has manifest arity<span class="idiff left right"> n</span></span></span>
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<pre style="margin: 0;"> <span id="LC1512" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (b) if is_bot is True then rhs' applied to n args is guaranteed bottom</span></span>
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<pre style="margin: 0;"> <span id="LC1513" class="line" lang="haskell"><span class="n" style="color: #333;">tryEtaExpandRhs</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC1514" 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;">join_arity</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isJoinId_maybe</span> <span class="n" style="color: #333;">bndr</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">@@ -1517,6 +1517,7 @@ tryEtaExpandRhs mode bndr rhs</td>
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<pre style="margin: 0;"> <span id="LC1517" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Do not eta-expand join points]</span></span>
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<pre style="margin: 0;"> <span id="LC1518" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- But do return the correct arity and bottom-ness, because</span></span>
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<pre style="margin: 0;"> <span id="LC1519" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- these are used to set the bndr's IdInfo (#15517)</span></span>
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<pre style="margin: 0;">+<span id="LC1520" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [idArity for join points]</span></span>
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<pre style="margin: 0;"> <span id="LC1521" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1522" 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="LC1523" 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="p">(</span><span class="n" style="color: #333;">new_arity</span><span class="p">,</span> <span class="n" style="color: #333;">is_bot</span><span class="p">,</span> <span class="n" style="color: #333;">new_rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">try_expand</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">@@ -1610,6 +1611,13 @@ CorePrep comes around, the code is very likely to look more like this:</td>
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<pre style="margin: 0;"> <span id="LC1611" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $j2 = if n > 0 then $j1</span></span>
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<pre style="margin: 0;"> <span id="LC1612" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> else (...) eta</span></span>
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<pre style="margin: 0;"> <span id="LC1613" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1614" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [idArity for join points]</span></span>
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<pre style="margin: 0;">+<span id="LC1615" 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="LC1616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Because of Note [Do not eta-expand join points] we have it that the idArity</span></span>
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<pre style="margin: 0;">+<span id="LC1617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of a join point is always (less than or) equal to the join arity.</span></span>
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<pre style="margin: 0;">+<span id="LC1618" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Essentially, for join points we set `idArity $j = count isId join_lam_bndrs`.</span></span>
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<pre style="margin: 0;">+<span id="LC1619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It really can be less if there are type-level binders in join_lam_bndrs.</span></span>
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<pre style="margin: 0;">+<span id="LC1620" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Do not eta-expand PAPs]</span></span>
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<pre style="margin: 0;"> <span id="LC1622" 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="LC1623" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We used to have old_arity = manifestArity rhs, which meant that we</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#ea6c99f43a7d52025b4dfaf7a7822038a54a9a84"><strong>compiler/stranal/DmdAnal.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">@@ -206,7 +206,6 @@ dmdAnal' env dmd (App fun arg)</td>
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , text "overall res dmd_ty =" <+> ppr (res_ty `bothDmdType` arg_ty) ])</span></span>
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">res_ty</span> <span class="p">`</span><span class="n" style="color: #333;">bothDmdType</span><span class="p">`</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="n" style="color: #333;">fun'</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- this is an anonymous lambda, since @dmdAnalRhsLetDown@ uses @collectBinders@</span></span>
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<pre style="margin: 0;"> <span id="LC209" class="line" lang="haskell"><span class="n" style="color: #333;">dmdAnal'</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dmd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">var</span></span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</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">@@ -286,10 +285,7 @@ dmdAnal' env dmd (Case scrut case_bndr ty alts)</td>
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<pre style="margin: 0;"> <span id="LC285" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is used for a non-recursive local let without manifest lambdas.</span></span>
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<pre style="margin: 0;"> <span id="LC286" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is the LetUp rule in the paper “Higher-Order Cardinality Analysis”.</span></span>
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<pre style="margin: 0;"> <span id="LC287" class="line" lang="haskell"><span class="n" style="color: #333;">dmdAnal'</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dmd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Let</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC289" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">useLetUp</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC290" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unpackTrivial</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC291" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- dmdAnalRhsLetDown treats trivial right hand sides specially</span></span>
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<pre style="margin: 0;">-<span id="LC292" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so if we have a trival right hand side, fall through to that.</span></span>
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<pre style="margin: 0;">+<span id="LC288" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">useLetUp</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;"> <span id="LC289" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">final_ty</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Let</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">id'</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC290" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC291" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">body_ty</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdAnal</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dmd</span> <span class="n" style="color: #333;">body</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">@@ -582,25 +578,6 @@ environment, which effectively assigns them 'nopSig' (see "getStrictness")</td>
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC579" 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="LC580" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC585" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Trivial RHS</span></span>
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<pre style="margin: 0;">-<span id="LC586" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Demand analysis for trivial right-hand sides]</span></span>
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<pre style="margin: 0;">-<span id="LC587" class="line" lang="haskell"><span class="n" style="color: #333;">dmdAnalTrivialRhs</span> <span class="o" style="font-weight: 600;">::</span></span>
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<pre style="margin: 0;">-<span id="LC588" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</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;">Var</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC589" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Id</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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<pre style="margin: 0;">-<span id="LC590" class="line" lang="haskell"><span class="n" style="color: #333;">dmdAnalTrivialRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">fn</span></span>
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<pre style="margin: 0;">-<span id="LC591" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">fn_fv</span><span class="p">,</span> <span class="n" style="color: #333;">set_idStrictness</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">fn_str</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC592" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC593" class="line" lang="haskell"> <span class="n" style="color: #333;">fn_str</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getStrictness</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">fn</span></span>
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<pre style="margin: 0;">-<span id="LC594" class="line" lang="haskell"> <span class="n" style="color: #333;">fn_fv</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isLocalId</span> <span class="n" style="color: #333;">fn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitVarEnv</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">topDmd</span></span>
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<pre style="margin: 0;">-<span id="LC595" 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;">emptyDmdEnv</span></span>
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<pre style="margin: 0;">-<span id="LC596" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Remember to demand the function itself]</span></span>
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<pre style="margin: 0;">-<span id="LC597" 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="LC598" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- fn_fv: don't forget to produce a demand for fn itself</span></span>
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<pre style="margin: 0;">-<span id="LC599" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Lacking this caused #9128</span></span>
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<pre style="margin: 0;">-<span id="LC600" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The demand is very conservative (topDmd), but that doesn't</span></span>
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<pre style="margin: 0;">-<span id="LC601" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- matter; trivial bindings are usually inlined, so it only</span></span>
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<pre style="margin: 0;">-<span id="LC602" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- kicks in for top-level bindings and NOINLINE bindings</span></span>
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<pre style="margin: 0;">-<span id="LC603" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Let bindings can be processed in two ways:</span></span>
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<pre style="margin: 0;"> <span id="LC582" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Down (RHS before body) or Up (body before RHS).</span></span>
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- dmdAnalRhsLetDown implements the Down variant:</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">@@ -621,28 +598,23 @@ dmdAnalRhsLetDown :: TopLevelFlag</td>
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<pre style="margin: 0;"> <span id="LC598" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Process the RHS of the binding, add the strictness signature</span></span>
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<pre style="margin: 0;"> <span id="LC599" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to the Id, and augment the environment with the signature as well.</span></span>
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<pre style="margin: 0;"> <span id="LC600" class="line" lang="haskell"><span class="n" style="color: #333;">dmdAnalRhsLetDown</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">rec_flag</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">let_dmd</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC624" 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;">fn</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unpackTrivial</span> <span class="n" style="color: #333;">rhs</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Demand analysis for trivial right-hand sides]</span></span>
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<pre style="margin: 0;">-<span id="LC625" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdAnalTrivialRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">fn</span></span>
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<pre style="margin: 0;">-<span id="LC626" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC627" 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="LC628" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">lazy_fv</span><span class="p">,</span> <span class="n" style="color: #333;">id'</span><span class="p">,</span> <span class="n" style="color: #333;">mkLams</span> <span class="n" style="color: #333;">bndrs'</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span></span>
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601
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<pre style="margin: 0;">+<span id="LC601" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">lazy_fv</span><span class="p">,</span> <span class="n" style="color: #333;">id'</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span></span>
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629
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602
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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630
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<pre style="margin: 0;">-<span id="LC630" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">,</span> <span class="n" style="color: #333;">body_dmd</span><span class="p">)</span></span>
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631
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<pre style="margin: 0;">-<span id="LC631" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">isJoinId_maybe</span> <span class="n" style="color: #333;">id</span> <span class="kr" style="font-weight: 600;">of</span></span>
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632
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<pre style="margin: 0;">-<span id="LC632" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">join_arity</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Demand analysis for join points]</span></span>
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633
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<pre style="margin: 0;">-<span id="LC633" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">collectNBinders</span> <span class="n" style="color: #333;">join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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634
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<pre style="margin: 0;">-<span id="LC634" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">,</span> <span class="n" style="color: #333;">let_dmd</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC635" class="line" lang="haskell"></span>
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636
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<pre style="margin: 0;">-<span id="LC636" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">collectBinders</span> <span class="n" style="color: #333;">rhs</span></span>
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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="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">,</span> <span class="n" style="color: #333;">mkBodyDmd</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC638" class="line" lang="haskell"></span>
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639
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<pre style="margin: 0;">-<span id="LC639" class="line" lang="haskell"> <span class="n" style="color: #333;">env_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldl'</span> <span class="n" style="color: #333;">extendSigsWithLam</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">bndrs</span></span>
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640
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<pre style="margin: 0;">-<span id="LC640" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">body_ty</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdAnal</span> <span class="n" style="color: #333;">env_body</span> <span class="n" style="color: #333;">body_dmd</span> <span class="n" style="color: #333;">body</span></span>
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641
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<pre style="margin: 0;">-<span id="LC641" class="line" lang="haskell"> <span class="n" style="color: #333;">body_ty'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">removeDmdTyArgs</span> <span class="n" style="color: #333;">body_ty</span> <span class="c1" style="color: #998; font-style: italic;">-- zap possible deep CPR info</span></span>
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642
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<pre style="margin: 0;">-<span id="LC642" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">rhs_fv</span> <span class="n" style="color: #333;">rhs_dmds</span> <span class="n" style="color: #333;">rhs_res</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">)</span></span>
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643
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<pre style="margin: 0;">-<span id="LC643" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">annotateLamBndrs</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">isDFunId</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="n" style="color: #333;">body_ty'</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;">-<span id="LC644" class="line" lang="haskell"> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkStrictSig</span> <span class="p">(</span><span class="n" style="color: #333;">mkDmdType</span> <span class="n" style="color: #333;">sig_fv</span> <span class="n" style="color: #333;">rhs_dmds</span> <span class="n" style="color: #333;">rhs_res'</span><span class="p">)</span></span>
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645
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<pre style="margin: 0;">-<span id="LC645" class="line" lang="haskell"> <span class="n" style="color: #333;">id'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">set_idStrictness</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;">+<span id="LC603" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_dmd</span></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Demand analysis for join points]</span></span>
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [idArity for join points] in SimplUtils</span></span>
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- rhs_arity matches the join arity of the join point</span></span>
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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC609" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCallDmds</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="n" style="color: #333;">let_dmd</span></span>
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<pre style="margin: 0;">+<span id="LC610" 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="LC611" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: rhs_arity</span></span>
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<pre style="margin: 0;">+<span id="LC612" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Demand signatures are computed for a threshold demand based on idArity]</span></span>
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<pre style="margin: 0;">+<span id="LC613" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkRhsDmd</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">rhs_fv</span> <span class="n" style="color: #333;">rhs_dmds</span> <span class="n" style="color: #333;">rhs_res</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC615" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdAnal</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs_dmd</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC616" class="line" lang="haskell"> <span class="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkStrictSigForArity</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="p">(</span><span class="n" style="color: #333;">mkDmdType</span> <span class="n" style="color: #333;">sig_fv</span> <span class="n" style="color: #333;">rhs_dmds</span> <span class="n" style="color: #333;">rhs_res'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"> <span class="n" style="color: #333;">id'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">set_idStrictness</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;"> <span id="LC618" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [NOINLINE and strictness]</span></span>
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="638" 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">@@ -666,36 +638,63 @@ dmdAnalRhsLetDown top_lvl rec_flag env let_dmd id rhs</td>
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<pre style="margin: 0;"> <span id="LC638" 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;">isStrictDmd</span> <span class="p">(</span><span class="n" style="color: #333;">idDemandInfo</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">ae_virgin</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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667
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Optimistic CPR in the "virgin" case]</span></span>
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668
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640
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC669" class="line" lang="haskell"><span class="n" style="color: #333;">mkBodyDmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</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;">CleanDemand</span></span>
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<pre style="margin: 0;">-<span id="LC670" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Product demands for function body]</span></span>
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<pre style="margin: 0;">-<span id="LC671" class="line" lang="haskell"><span class="n" style="color: #333;">mkBodyDmd</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">body</span></span>
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672
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<pre style="margin: 0;">-<span id="LC672" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">deepSplitProductType_maybe</span> <span class="p">(</span><span class="n" style="color: #333;">ae_fam_envs</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC673" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">cleanEvalDmd</span></span>
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674
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<pre style="margin: 0;">-<span id="LC674" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">dc</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">cleanEvalProdDmd</span> <span class="p">(</span><span class="n" style="color: #333;">dataConRepArity</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC675" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC676" class="line" lang="haskell"><span class="n" style="color: #333;">unpackTrivial</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;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span></span>
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677
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<pre style="margin: 0;">-<span id="LC677" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns (Just v) if the arg is really equal to v, modulo</span></span>
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<pre style="margin: 0;">-<span id="LC678" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- casts, type applications etc</span></span>
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<pre style="margin: 0;">-<span id="LC679" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Demand analysis for trivial right-hand sides]</span></span>
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<pre style="margin: 0;">-<span id="LC680" class="line" lang="haskell"><span class="n" style="color: #333;">unpackTrivial</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="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">v</span></span>
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681
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<pre style="margin: 0;">-<span id="LC681" class="line" lang="haskell"><span class="n" style="color: #333;">unpackTrivial</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">e</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;">unpackTrivial</span> <span class="n" style="color: #333;">e</span></span>
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682
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<pre style="margin: 0;">-<span id="LC682" class="line" lang="haskell"><span class="n" style="color: #333;">unpackTrivial</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">v</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;">isTyVar</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unpackTrivial</span> <span class="n" style="color: #333;">e</span></span>
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683
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<pre style="margin: 0;">-<span id="LC683" class="line" lang="haskell"><span class="n" style="color: #333;">unpackTrivial</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTypeArg</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unpackTrivial</span> <span class="n" style="color: #333;">e</span></span>
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684
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<pre style="margin: 0;">-<span id="LC684" class="line" lang="haskell"><span class="n" style="color: #333;">unpackTrivial</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">-<span id="LC685" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC686" class="line" lang="haskell"><span class="cd">-- | If given the RHS of a let-binding, this 'useLetUp' determines</span></span>
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<pre style="margin: 0;">-<span id="LC687" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- whether we should process the binding up (body before rhs) or</span></span>
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<pre style="margin: 0;">-<span id="LC688" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- down (rhs before body).</span></span>
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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"><span class="cd">-- | @mkRhsDmd env rhs_arity rhs@ creates a 'CleanDemand' for</span></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- unleashing on the given function's @rhs@, by creating a call demand of</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;">-- @rhs_arity@ with a body demand appropriate for possible product types.</span></span>
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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Product demands for function body].</span></span>
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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For example, a call of the form @mkRhsDmd _ 2 (\x y -> (x, y))@ returns a</span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- clean usage demand of @C1(C1(U(U,U)))@.</span></span>
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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"><span class="n" style="color: #333;">mkRhsDmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity</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;">CleanDemand</span></span>
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"><span class="n" style="color: #333;">mkRhsDmd</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">peelTsFuns</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="p">(</span><span class="n" style="color: #333;">findTypeShape</span> <span class="p">(</span><span class="n" style="color: #333;">ae_fam_envs</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">rhs</span><span class="p">))</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TsProd</span> <span class="n" style="color: #333;">tss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkCallDmds</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="p">(</span><span class="n" style="color: #333;">cleanEvalProdDmd</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">tss</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC651" 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;">mkCallDmds</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="n" style="color: #333;">cleanEvalDmd</span></span>
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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC653" class="line" lang="haskell"><span class="cd">-- | If given the let-bound 'Id', 'useLetUp' determines whether we should</span></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;">-- process the binding up (body before rhs) or down (rhs before body).</span></span>
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<pre style="margin: 0;"> <span id="LC655" 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="LC690" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We use LetDown if there is a chance to get a useful strictness signature.</span></span>
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<pre style="margin: 0;">-<span id="LC691" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is the case when there are manifest value lambdas or the binding is a</span></span>
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<pre style="margin: 0;">-<span id="LC692" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- join point (hence always acts like a function, not a value).</span></span>
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<pre style="margin: 0;">-<span id="LC693" class="line" lang="haskell"><span class="n" style="color: #333;">useLetUp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC694" class="line" lang="haskell"><span class="n" style="color: #333;">useLetUp</span> <span class="n" style="color: #333;">f</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC695" class="line" lang="haskell"><span class="n" style="color: #333;">useLetUp</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">v</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;">isTyVar</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">useLetUp</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">-<span id="LC696" class="line" lang="haskell"><span class="n" style="color: #333;">useLetUp</span> <span class="kr" 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="kt" style="color: #458; font-weight: 600;">False</span></span>
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697
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<pre style="margin: 0;">-<span id="LC697" class="line" lang="haskell"><span class="n" style="color: #333;">useLetUp</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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698
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<pre style="margin: 0;">-<span id="LC698" class="line" lang="haskell"></span>
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656
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We use LetDown if there is a chance to get a useful strictness signature to</span></span>
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657
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- unleash at call sites. LetDown is generally more precise than LetUp if we can</span></span>
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658
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<pre style="margin: 0;">+<span id="LC658" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- correctly guess how it will be used in the body, that is, for which incoming</span></span>
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659
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<pre style="margin: 0;">+<span id="LC659" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- demand the strictness signature should be computed, which allows us to</span></span>
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660
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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- unleash higher-order demands on arguments at call sites. This is mostly the</span></span>
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661
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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- case when</span></span>
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662
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<pre style="margin: 0;">+<span id="LC662" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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663
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<pre style="margin: 0;">+<span id="LC663" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * The binding takes any arguments before performing meaningful work (cf.</span></span>
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664
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<pre style="margin: 0;">+<span id="LC664" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'idArity'), in which case we are interested to see how it uses them.</span></span>
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<pre style="margin: 0;">+<span id="LC665" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * The binding is a join point, hence acting like a function, not a value.</span></span>
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<pre style="margin: 0;">+<span id="LC666" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- As a big plus, we know *precisely* how it will be used in the body; since</span></span>
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667
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<pre style="margin: 0;">+<span id="LC667" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- it's always tail-called, we can directly unleash the incoming demand of</span></span>
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668
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<pre style="margin: 0;">+<span id="LC668" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the let binding on its RHS when computing a strictness signature. See</span></span>
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669
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<pre style="margin: 0;">+<span id="LC669" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [Demand analysis for join points].</span></span>
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670
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<pre style="margin: 0;">+<span id="LC670" 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="LC671" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Thus, if the binding is not a join point and its arity is 0, we have a thunk</span></span>
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672
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<pre style="margin: 0;">+<span id="LC672" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and use LetUp, implying that we have no usable demand signature available</span></span>
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673
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<pre style="margin: 0;">+<span id="LC673" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- when we analyse the let body.</span></span>
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674
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<pre style="margin: 0;">+<span id="LC674" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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675
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<pre style="margin: 0;">+<span id="LC675" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Since thunk evaluation is memoised, we want to unleash its 'DmdEnv' of free</span></span>
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676
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<pre style="margin: 0;">+<span id="LC676" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- vars at most once, regardless of how many times it was forced in the body.</span></span>
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<pre style="margin: 0;">+<span id="LC677" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This makes a real difference wrt. usage demands. The other reason is being</span></span>
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<pre style="margin: 0;">+<span id="LC678" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- able to unleash a more precise product demand on its RHS once we know how the</span></span>
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679
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<pre style="margin: 0;">+<span id="LC679" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- thunk was used in the let body.</span></span>
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680
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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681
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<pre style="margin: 0;">+<span id="LC681" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Characteristic examples, always assuming a single evaluation:</span></span>
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682
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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683
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<pre style="margin: 0;">+<span id="LC683" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @let x = 2*y in x + x@ => LetUp. Compared to LetDown, we find out that</span></span>
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684
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the expression uses @y@ at most once.</span></span>
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<pre style="margin: 0;">+<span id="LC685" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @let x = (a,b) in fst x@ => LetUp. Compared to LetDown, we find out that</span></span>
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686
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<pre style="margin: 0;">+<span id="LC686" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @b@ is absent.</span></span>
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<pre style="margin: 0;">+<span id="LC687" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @let f x = x*2 in f y@ => LetDown. Compared to LetUp, we find out that</span></span>
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<pre style="margin: 0;">+<span id="LC688" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the expression uses @y@ strictly, because we have @f@'s demand signature</span></span>
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<pre style="margin: 0;">+<span id="LC689" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- available at the call site.</span></span>
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @join exit = 2*y in if a then exit else if b then exit else 3*y@ =></span></span>
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- LetDown. Compared to LetUp, we find out that the expression uses @y@</span></span>
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692
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- strictly, because we can unleash @exit@'s signature at each call site.</span></span>
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<pre style="margin: 0;">+<span id="LC693" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * For a more convincing example with join points, see Note [Demand analysis</span></span>
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<pre style="margin: 0;">+<span id="LC694" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for join points].</span></span>
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695
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<pre style="margin: 0;">+<span id="LC695" 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="LC696" class="line" lang="haskell"><span class="n" style="color: #333;">useLetUp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell"><span class="n" style="color: #333;">useLetUp</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span> <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;">isJoinId</span> <span class="n" style="color: #333;">f</span><span class="p">)</span></span>
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698
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<pre style="margin: 0;"> <span id="LC698" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC699" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Demand analysis for join points]</span></span>
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"><span class="cm" 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">@@ -728,22 +727,141 @@ let_dmd here).</td>
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<pre style="margin: 0;"> <span id="LC727" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC728" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Another win for join points! #13543.</span></span>
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<pre style="margin: 0;"> <span id="LC729" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Demand signatures are computed for a threshold demand based on idArity]</span></span>
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<pre style="margin: 0;">+<span id="LC731" 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="LC732" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We compute demand signatures assuming idArity incoming arguments to approximate</span></span>
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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">behavior for when we have a call site with at least that many arguments. idArity</span></span>
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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is /at least/ the number of manifest lambdas, but might be higher for PAPs and</span></span>
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">trivial RHS (see Note [Demand analysis for trivial right-hand sides]).</span></span>
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Because idArity of a function varies independently of its cardinality properties</span></span>
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(cf. Note [idArity varies independently of dmdTypeDepth]), we implicitly encode</span></span>
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<pre style="margin: 0;">+<span id="LC739" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the arity for when a demand signature is sound to unleash in its 'dmdTypeDepth'</span></span>
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<pre style="margin: 0;">+<span id="LC740" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(cf. Note [Understanding DmdType and StrictSig] in Demand). It is unsound to</span></span>
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<pre style="margin: 0;">+<span id="LC741" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unleash a demand signature when the incoming number of arguments is less than</span></span>
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<pre style="margin: 0;">+<span id="LC742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that. See Note [What are demand signatures?] for more details on soundness.</span></span>
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<pre style="margin: 0;">+<span id="LC743" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC744" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why idArity arguments? Because that's a conservative estimate of how many</span></span>
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<pre style="margin: 0;">+<span id="LC745" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">arguments we must feed a function before it does anything interesting with them.</span></span>
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<pre style="margin: 0;">+<span id="LC746" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Also it elegantly subsumes the trivial RHS and PAP case.</span></span>
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747
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<pre style="margin: 0;">+<span id="LC747" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC748" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There might be functions for which we might want to analyse for more incoming</span></span>
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749
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<pre style="margin: 0;">+<span id="LC749" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">arguments than idArity. Example:</span></span>
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750
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<pre style="margin: 0;">+<span id="LC750" class="line" lang="haskell"></span>
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751
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<pre style="margin: 0;">+<span id="LC751" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x =</span></span>
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752
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<pre style="margin: 0;">+<span id="LC752" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if expensive</span></span>
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753
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<pre style="margin: 0;">+<span id="LC753" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then \y -> ... y ...</span></span>
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754
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<pre style="margin: 0;">+<span id="LC754" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> else \y -> ... y ...</span></span>
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755
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<pre style="margin: 0;">+<span id="LC755" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC756" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We'd analyse `f` under a unary call demand C(S), corresponding to idArity</span></span>
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757
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<pre style="margin: 0;">+<span id="LC757" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">being 1. That's enough to look under the manifest lambda and find out how a</span></span>
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758
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<pre style="margin: 0;">+<span id="LC758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unary call would use `x`, but not enough to look into the lambdas in the if</span></span>
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759
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<pre style="margin: 0;">+<span id="LC759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">branches.</span></span>
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760
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<pre style="margin: 0;">+<span id="LC760" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC761" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">On the other hand, if we analysed for call demand C(C(S)), we'd get useful</span></span>
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762
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">strictness info for `y` (and more precise info on `x`) and possibly CPR</span></span>
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763
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">information, but</span></span>
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764
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="haskell"></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;"> * We would no longer be able to unleash the signature at unary call sites</span></span>
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766
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Performing the worker/wrapper split based on this information would be</span></span>
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767
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> implicitly eta-expanding `f`, playing fast and loose with divergence and</span></span>
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768
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> even being unsound in the presence of newtypes, so we refrain from doing so.</span></span>
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769
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Also see Note [Don't eta expand in w/w] in WorkWrap.</span></span>
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770
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<pre style="margin: 0;">+<span id="LC770" class="line" lang="haskell"></span>
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771
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Since we only compute one signature, we do so for arity 1. Computing multiple</span></span>
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772
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">signatures for different arities (i.e., polyvariance) would be entirely</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;">possible, if it weren't for the additional runtime and implementation</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;">complexity.</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;">Note [idArity varies independently of dmdTypeDepth]</span></span>
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777
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<pre style="margin: 0;">+<span id="LC777" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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778
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We used to check in CoreLint that dmdTypeDepth <= idArity for a let-bound</span></span>
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779
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<pre style="margin: 0;">+<span id="LC779" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">identifier. But that means we would have to zap demand signatures every time we</span></span>
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780
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<pre style="margin: 0;">+<span id="LC780" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">reset or decrease arity. That's an unnecessary dependency, because</span></span>
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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;"> * The demand signature captures a semantic property that is independent of</span></span>
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783
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> what the binding's current arity is</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;"> * idArity is analysis information itself, thus volatile</span></span>
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We already *have* dmdTypeDepth, wo why not just use it to encode the</span></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;"> threshold for when to unleash the signature</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;"> (cf. Note [Understanding DmdType and StrictSig] in Demand)</span></span>
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788
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<pre style="margin: 0;">+<span id="LC788" class="line" lang="haskell"></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;">Consider the following expression, for example:</span></span>
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790
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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;"> (let go x y = `x` seq ... in go) |> co</span></span>
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792
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`go` might have a strictness signature of `<S><L>`. The simplifier will identify</span></span>
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794
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`go` as a nullary join point through `joinPointBinding_maybe` and float the</span></span>
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795
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<pre style="margin: 0;">+<span id="LC795" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">coercion into the binding, leading to an arity decrease:</span></span>
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796
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"></span>
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797
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<pre style="margin: 0;">+<span id="LC797" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> join go = (\x y -> `x` seq ...) |> co in go</span></span>
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798
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<pre style="margin: 0;">+<span id="LC798" class="line" lang="haskell"></span>
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799
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<pre style="margin: 0;">+<span id="LC799" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">With the CoreLint check, we would have to zap `go`'s perfectly viable strictness</span></span>
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800
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<pre style="margin: 0;">+<span id="LC800" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">signature.</span></span>
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801
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<pre style="margin: 0;">+<span id="LC801" class="line" lang="haskell"></span>
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802
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<pre style="margin: 0;">+<span id="LC802" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [What are demand signatures?]</span></span>
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803
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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804
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<pre style="margin: 0;">+<span id="LC804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Demand analysis interprets expressions in the abstract domain of demand</span></span>
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805
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<pre style="margin: 0;">+<span id="LC805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">transformers. Given an incoming demand we put an expression under, its abstract</span></span>
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806
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<pre style="margin: 0;">+<span id="LC806" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">transformer gives us back a demand type denoting how other things (like</span></span>
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807
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<pre style="margin: 0;">+<span id="LC807" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">arguments and free vars) were used when the expression was evaluated.</span></span>
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808
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<pre style="margin: 0;">+<span id="LC808" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here's an example:</span></span>
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809
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<pre style="margin: 0;">+<span id="LC809" class="line" lang="haskell"></span>
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810
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<pre style="margin: 0;">+<span id="LC810" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x y =</span></span>
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811
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<pre style="margin: 0;">+<span id="LC811" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if x + expensive</span></span>
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812
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<pre style="margin: 0;">+<span id="LC812" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then \z -> z + y * ...</span></span>
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813
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<pre style="margin: 0;">+<span id="LC813" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> else \z -> z * ...</span></span>
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814
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<pre style="margin: 0;">+<span id="LC814" class="line" lang="haskell"></span>
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815
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<pre style="margin: 0;">+<span id="LC815" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The abstract transformer (let's call it F_e) of the if expression (let's call it</span></span>
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816
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<pre style="margin: 0;">+<span id="LC816" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">e) would transform an incoming head demand <S,HU> into a demand type like</span></span>
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817
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<pre style="margin: 0;">+<span id="LC817" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{x-><S,1*U>,y-><L,U>}<L,U>. In pictures:</span></span>
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818
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<pre style="margin: 0;">+<span id="LC818" class="line" lang="haskell"></span>
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819
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<pre style="margin: 0;">+<span id="LC819" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Demand ---F_e---> DmdType</span></span>
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820
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<pre style="margin: 0;">+<span id="LC820" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <S,HU> {x-><S,1*U>,y-><L,U>}<L,U></span></span>
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821
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<pre style="margin: 0;">+<span id="LC821" class="line" lang="haskell"></span>
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822
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<pre style="margin: 0;">+<span id="LC822" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Let's assume that the demand transformers we compute for an expression are</span></span>
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823
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<pre style="margin: 0;">+<span id="LC823" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">correct wrt. to some concrete semantics for Core. How do demand signatures fit</span></span>
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824
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<pre style="margin: 0;">+<span id="LC824" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in? They are strange beasts, given that they come with strict rules when to</span></span>
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825
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<pre style="margin: 0;">+<span id="LC825" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it's sound to unleash them.</span></span>
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826
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<pre style="margin: 0;">+<span id="LC826" class="line" lang="haskell"></span>
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827
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<pre style="margin: 0;">+<span id="LC827" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Fortunately, we can formalise the rules with Galois connections. Consider</span></span>
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828
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<pre style="margin: 0;">+<span id="LC828" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">f's strictness signature, {}<S,1*U><L,U>. It's a single-point approximation of</span></span>
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829
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the actual abstract transformer of f's RHS for arity 2. So, what happens is that</span></span>
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830
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we abstract *once more* from the abstract domain we already are in, replacing</span></span>
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831
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<pre style="margin: 0;">+<span id="LC831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the incoming Demand by a simple lattice with two elements denoting incoming</span></span>
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832
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">arity: A_2 = {<2, >=2} (where '<2' is the top element and >=2 the bottom</span></span>
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833
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<pre style="margin: 0;">+<span id="LC833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">element). Here's the diagram:</span></span>
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834
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<pre style="margin: 0;">+<span id="LC834" class="line" lang="haskell"></span>
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835
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A_2 -----f_f----> DmdType</span></span>
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836
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ^ |</span></span>
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837
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | α γ |</span></span>
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838
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<pre style="margin: 0;">+<span id="LC838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | v</span></span>
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839
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<pre style="margin: 0;">+<span id="LC839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Demand ---F_f---> DmdType</span></span>
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840
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<pre style="margin: 0;">+<span id="LC840" class="line" lang="haskell"></span>
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841
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<pre style="margin: 0;">+<span id="LC841" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">With</span></span>
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842
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<pre style="margin: 0;">+<span id="LC842" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> α(C1(C1(_))) = >=2 -- example for usage demands, but similar for strictness</span></span>
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843
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<pre style="margin: 0;">+<span id="LC843" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> α(_) = <2</span></span>
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844
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<pre style="margin: 0;">+<span id="LC844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> γ(ty) = ty</span></span>
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<pre style="margin: 0;">+<span id="LC845" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and F_f being the abstract transformer of f's RHS and f_f being the abstracted</span></span>
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">abstract transformer computable from our demand signature simply by</span></span>
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<pre style="margin: 0;">+<span id="LC847" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC848" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f_f(>=2) = {}<S,1*U><L,U></span></span>
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<pre style="margin: 0;">+<span id="LC849" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f_f(<2) = postProcessUnsat {}<S,1*U><L,U></span></span>
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850
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"></span>
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851
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<pre style="margin: 0;">+<span id="LC851" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where postProcessUnsat makes a proper top element out of the given demand type.</span></span>
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852
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<pre style="margin: 0;">+<span id="LC852" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Demand analysis for trivial right-hand sides]</span></span>
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854
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<pre style="margin: 0;"> <span id="LC854" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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855
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<pre style="margin: 0;"> <span id="LC855" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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<pre style="margin: 0;">-<span id="LC734" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> </span>foo = plusInt |> co</span></span>
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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo = plusInt |> co</span></span>
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where plusInt is an arity-2 function with known strictness. Clearly</span></span>
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736
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858
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we want plusInt's strictness to propagate to foo! But because it has</span></span>
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859
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">no manifest lambdas, it won't do so automatically, and indeed 'co' might</span></span>
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738
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<pre style="margin: 0;">-<span id="LC738" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">have type (Int->Int->Int) ~ T, so we *can't* eta-expand. So we have a</span></span>
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739
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<pre style="margin: 0;">-<span id="LC739" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">special case for right-hand sides that are "trivial", namely variables,</span></span>
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740
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<pre style="margin: 0;">-<span id="LC740" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">casts, type applications, and the like.</span></span>
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">have type (Int->Int->Int) ~ T.</span></span>
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861
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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="LC742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that this can mean that 'foo' has an arity that is smaller than that</span></span>
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743
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<pre style="margin: 0;">-<span id="LC743" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">indicated by its demand info. e.g. if co :: (Int->Int->Int) ~ T, then</span></span>
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744
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<pre style="margin: 0;">-<span id="LC744" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">foo's arity will be zero (see Note [exprArity invariant] in CoreArity),</span></span>
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<pre style="margin: 0;">-<span id="LC745" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but its demand signature will be that of plusInt. A small example is the</span></span>
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<pre style="margin: 0;">-<span id="LC746" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">test case of #8963.</span></span>
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Fortunately, CoreArity gives 'foo' arity 2, which is enough for LetDown to</span></span>
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">forward plusInt's demand signature, and all is well (see Note [Newtype arity] in</span></span>
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CoreArity)! A small example is the test case NewtypeArity.</span></span>
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Product demands for function body]</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">@@ -841,13 +959,6 @@ annotateBndr env dmd_ty var</td>
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<pre style="margin: 0;"> <span id="LC959" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC960" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">dmd_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">dmd</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findBndrDmd</span> <span class="n" style="color: #333;">env</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">dmd_ty</span> <span class="n" style="color: #333;">var</span></span>
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<pre style="margin: 0;"> <span id="LC961" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC844" class="line" lang="haskell"><span class="n" style="color: #333;">annotateLamBndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DFunFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC845" class="line" lang="haskell"><span class="n" style="color: #333;">annotateLamBndrs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">args_of_dfun</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAccumR</span> <span class="n" style="color: #333;">annotate</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;">-<span id="LC846" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC847" class="line" lang="haskell"> <span class="n" style="color: #333;">annotate</span> <span class="n" style="color: #333;">dmd_ty</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;">-<span id="LC848" 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;">bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">annotateLamIdBndr</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">args_of_dfun</span> <span class="n" style="color: #333;">dmd_ty</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;">-<span id="LC849" 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="p">(</span><span class="n" style="color: #333;">dmd_ty</span><span class="p">,</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC850" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC962" class="line" lang="haskell"><span class="n" style="color: #333;">annotateLamIdBndr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span></span>
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<pre style="margin: 0;"> <span id="LC963" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DFunFlag</span> <span class="c1" style="color: #998; font-style: italic;">-- is this lambda at the top of the RHS of a dfun?</span></span>
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<pre style="margin: 0;"> <span id="LC964" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="c1" style="color: #998; font-style: italic;">-- Demand type of body</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">@@ -1160,12 +1271,6 @@ extendSigEnv top_lvl sigs var sig = extendVarEnv sigs var (sig, top_lvl)</td>
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<pre style="margin: 0;"> <span id="LC1271" class="line" lang="haskell"><span class="n" style="color: #333;">lookupSigEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</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;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span><span class="p">)</span></span>
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1161
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<pre style="margin: 0;"> <span id="LC1272" class="line" lang="haskell"><span class="n" style="color: #333;">lookupSigEnv</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;">ae_sigs</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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1273
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<pre style="margin: 0;"> <span id="LC1273" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1163" class="line" lang="haskell"><span class="n" style="color: #333;">getStrictness</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</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;">StrictSig</span></span>
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1164
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<pre style="margin: 0;">-<span id="LC1164" class="line" lang="haskell"><span class="n" style="color: #333;">getStrictness</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">fn</span></span>
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1165
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<pre style="margin: 0;">-<span id="LC1165" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isGlobalId</span> <span class="n" style="color: #333;">fn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idStrictness</span> <span class="n" style="color: #333;">fn</span></span>
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1166
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<pre style="margin: 0;">-<span id="LC1166" 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;">sig</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;">lookupSigEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">fn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig</span></span>
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1167
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<pre style="margin: 0;">-<span id="LC1167" 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;">nopSig</span></span>
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<pre style="margin: 0;">-<span id="LC1168" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1274" class="line" lang="haskell"><span class="n" style="color: #333;">nonVirgin</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span></span>
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<pre style="margin: 0;"> <span id="LC1275" class="line" lang="haskell"><span class="n" style="color: #333;">nonVirgin</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">{</span> <span class="n" style="color: #333;">ae_virgin</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1276" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#8459cd38c85420ab196f6823883c62b658b7edaa"><strong>compiler/stranal/WorkWrap.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">@@ -9,6 +9,7 @@ module WorkWrap ( wwTopBinds ) where</td>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GhcPrelude</span></span>
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11
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11
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">CoreArity</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">manifestArity</span> <span class="p">)</span></span>
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12
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13
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">CoreSyn</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">CoreUnfold</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">certainlyWillInline</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWwInlineRule</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWorkerUnfolding</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">CoreUtils</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">exprType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprIsHNF</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">@@ -457,7 +458,7 @@ tryWW dflags fam_envs is_rec fn_id rhs</td>
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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Don't w/w INLINE things]</span></span>
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<pre style="margin: 0;"> <span id="LC459" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Don't w/w inline small non-loop-breaker things]</span></span>
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<pre style="margin: 0;"> <span id="LC460" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC460" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_fun</span></span>
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<pre style="margin: 0;">+<span id="LC461" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_fun</span><span class="idiff left"> </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 right">is_eta_exp</span></span></span>
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<pre style="margin: 0;"> <span id="LC462" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitFun</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">new_fn_id</span> <span class="n" style="color: #333;">fn_info</span> <span class="n" style="color: #333;">wrap_dmds</span> <span class="n" style="color: #333;">res_info</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC463" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_thunk</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Thunk splitting]</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">@@ -474,9 +475,11 @@ tryWW dflags fam_envs is_rec fn_id rhs</td>
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<pre style="margin: 0;"> <span id="LC475" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Zapping DmdEnv after Demand Analyzer] and</span></span>
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<pre style="margin: 0;"> <span id="LC476" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Zapping Used Once info in WorkWrap]</span></span>
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<pre style="margin: 0;"> <span id="LC477" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC477" class="line" lang="haskell"> <span class="n" style="color: #333;">is_fun</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">notNull</span> <span class="n" style="color: #333;">wrap_dmds</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">fn_id</span></span>
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<pre style="margin: 0;">-<span id="LC478" class="line" lang="haskell"> <span class="n" style="color: #333;">is_thunk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">is_fun</span> <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;">exprIsHNF</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;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">fn_id</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC479" 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;">isUnliftedType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">fn_id</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC478" class="line" lang="haskell"> <span class="n" style="color: #333;">is_fun</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">notNull</span> <span class="n" style="color: #333;">wrap_dmds</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">fn_id</span></span>
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<pre style="margin: 0;">+<span id="LC479" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Don't eta expand in w/w]</span></span>
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<pre style="margin: 0;">+<span id="LC480" class="line" lang="haskell"> <span class="n" style="color: #333;">is_eta_exp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">wrap_dmds</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">manifestArity</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC481" class="line" lang="haskell"> <span class="n" style="color: #333;">is_thunk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">is_fun</span> <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;">exprIsHNF</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;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">fn_id</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC482" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isUnliftedType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">fn_id</span><span class="p">))</span></span>
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483
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<pre style="margin: 0;"> <span id="LC483" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC484" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC485" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Zapping DmdEnv after Demand Analyzer]</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">@@ -516,6 +519,36 @@ want to _keep_ the info for the code generator).</td>
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519
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<pre style="margin: 0;"> <span id="LC519" class="line" lang="haskell"></span>
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517
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520
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<pre style="margin: 0;"> <span id="LC520" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do not do it in the demand analyser for the same reasons outlined in</span></span>
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518
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521
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Zapping DmdEnv after Demand Analyzer] above.</span></span>
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522
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<pre style="margin: 0;">+<span id="LC522" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC523" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Don't eta expand in w/w]</span></span>
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524
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<pre style="margin: 0;">+<span id="LC524" 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="LC525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A binding where the manifestArity of the RHS is less than idArity of the binder</span></span>
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526
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<pre style="margin: 0;">+<span id="LC526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">means CoreArity didn't eta expand that binding. When this happens, it does so</span></span>
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for a reason (see Note [exprArity invariant] in CoreArity) and we probably have</span></span>
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<pre style="margin: 0;">+<span id="LC528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a PAP, cast or trivial expression as RHS.</span></span>
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529
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Performing the worker/wrapper split will implicitly eta-expand the binding to</span></span>
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">idArity, overriding CoreArity's decision. Other than playing fast and loose with</span></span>
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">divergence, it's also broken for newtypes:</span></span>
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = (\xy.blah) |> co</span></span>
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535
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<pre style="margin: 0;">+<span id="LC535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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536
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<pre style="margin: 0;">+<span id="LC536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co :: (Int -> Int -> Char) ~ T</span></span>
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537
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then idArity is 2 (despite the type T), and it can have a StrictSig based on a</span></span>
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">threshold of 2. But we can't w/w it without a type error.</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The situation is less grave for PAPs, but the implicit eta expansion caused a</span></span>
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542
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">compiler allocation regression in T15164, where huge recursive instance method</span></span>
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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">groups, mostly consisting of PAPs, got w/w'd. This caused great churn in the</span></span>
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<pre style="margin: 0;">+<span id="LC544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">simplifier, when simply waiting for the PAPs to inline arrived at the same</span></span>
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<pre style="margin: 0;">+<span id="LC545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">output program.</span></span>
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<pre style="margin: 0;">+<span id="LC546" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note there is the worry here that such PAPs and trivial RHSs might not *always*</span></span>
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<pre style="margin: 0;">+<span id="LC548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be inlined. That would lead to reboxing, because the analysis tacitly assumes</span></span>
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<pre style="margin: 0;">+<span id="LC549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that we W/W'd for idArity and will propagate analysis information under that</span></span>
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550
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<pre style="margin: 0;">+<span id="LC550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">assumption. So far, this doesn't seem to matter in practice.</span></span>
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<pre style="margin: 0;">+<span id="LC551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See https://gitlab.haskell.org/ghc/ghc/merge_requests/312#note_192064.</span></span>
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<pre style="margin: 0;"> <span id="LC552" 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="LC553" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC554" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#fefba0bb63e2af077c91206052f9c20caa85d3c7"><strong>compiler/stranal/WwLib.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">@@ -134,7 +134,7 @@ mkWwBodies :: DynFlags</td>
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- wrap_fn_str E = case x of { (a,b) -></span></span>
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135
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- case a of { (a1,a2) -></span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- E a1 a2 b y }}</span></span>
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137
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<pre style="margin: 0;">-<span id="LC137" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- work_fn_str E = \a<span class="idiff left right">2</span> a2 b y -></span></span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- work_fn_str E = \a<span class="idiff left right">1</span> a2 b y -></span></span>
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138
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- let a = (a1,a2) in</span></span>
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139
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- let x = (a,b) in</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- E</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#17688feb9e683bf0803ef737d589644e7e5e2621"><strong>testsuite/tests/perf/compiler/WWRec.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MultiParamTypeClasses #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE FlexibleContexts #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE FlexibleInstances #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UndecidableInstances #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">WWRec</span> <span class="kr" style="font-weight: 600;">where</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Decorator</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Decorator</span> <span class="n" style="color: #333;">f</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A1</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA1</span> <span class="kt" style="color: #458; font-weight: 600;">A2</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A2</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA2</span> <span class="kt" style="color: #458; font-weight: 600;">A3</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A3</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA3</span> <span class="kt" style="color: #458; font-weight: 600;">A4</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A4</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA4</span> <span class="kt" style="color: #458; font-weight: 600;">A5</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A5</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA5</span> <span class="kt" style="color: #458; font-weight: 600;">A6</span></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A6</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA6</span> <span class="kt" style="color: #458; font-weight: 600;">A7</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A7</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA7</span> <span class="kt" style="color: #458; font-weight: 600;">A8</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A8</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA8</span> <span class="kt" style="color: #458; font-weight: 600;">A9</span></span>
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<td class="diff-line-num new new_line" data-linenumber="21" 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">
21
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A9</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA9</span> <span class="kt" style="color: #458; font-weight: 600;">A10</span></span>
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<td class="diff-line-num new new_line" data-linenumber="22" 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">
22
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A10</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA10</span> <span class="kt" style="color: #458; font-weight: 600;">A11</span></span>
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<td class="diff-line-num new new_line" data-linenumber="23" 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">
23
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A11</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA11</span> <span class="kt" style="color: #458; font-weight: 600;">A12</span></span>
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<td class="diff-line-num new new_line" data-linenumber="24" 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">
24
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A12</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA12</span> <span class="kt" style="color: #458; font-weight: 600;">A13</span></span>
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<td class="diff-line-num new new_line" data-linenumber="25" 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">
25
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A13</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA13</span> <span class="kt" style="color: #458; font-weight: 600;">A14</span></span>
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<td class="diff-line-num new new_line" data-linenumber="26" 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">
26
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A14</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA14</span> <span class="kt" style="color: #458; font-weight: 600;">A15</span></span>
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<td class="diff-line-num new new_line" data-linenumber="27" 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">
27
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A15</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA15</span> <span class="kt" style="color: #458; font-weight: 600;">A16</span></span>
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<td class="diff-line-num new new_line" data-linenumber="28" 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">
28
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A16</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA16</span> <span class="kt" style="color: #458; font-weight: 600;">A17</span></span>
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<td class="diff-line-num new new_line" data-linenumber="29" 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">
29
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A17</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA17</span> <span class="kt" style="color: #458; font-weight: 600;">A18</span></span>
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<td class="diff-line-num new new_line" data-linenumber="30" 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">
30
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A18</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA18</span> <span class="kt" style="color: #458; font-weight: 600;">A19</span></span>
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<td class="diff-line-num new new_line" data-linenumber="31" 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">
31
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A19</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA19</span> <span class="kt" style="color: #458; font-weight: 600;">A20</span></span>
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<td class="diff-line-num new new_line" data-linenumber="32" 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">
32
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A20</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA20</span> <span class="kt" style="color: #458; font-weight: 600;">A21</span></span>
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<td class="diff-line-num new new_line" data-linenumber="33" 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">
33
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A21</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA21</span> <span class="kt" style="color: #458; font-weight: 600;">A22</span></span>
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<td class="diff-line-num new new_line" data-linenumber="34" 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">
34
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A22</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA22</span> <span class="kt" style="color: #458; font-weight: 600;">A23</span></span>
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<td class="diff-line-num new new_line" data-linenumber="35" 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">
35
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A23</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA23</span> <span class="kt" style="color: #458; font-weight: 600;">A24</span></span>
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<td class="diff-line-num new new_line" data-linenumber="36" 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">
36
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A24</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA24</span> <span class="kt" style="color: #458; font-weight: 600;">A25</span></span>
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<td class="diff-line-num new new_line" data-linenumber="37" 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">
37
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A25</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA25</span> <span class="kt" style="color: #458; font-weight: 600;">A26</span></span>
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<td class="diff-line-num new new_line" data-linenumber="38" 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">
38
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A26</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA26</span> <span class="kt" style="color: #458; font-weight: 600;">A27</span></span>
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<td class="diff-line-num new new_line" data-linenumber="39" 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">
39
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A27</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA27</span> <span class="kt" style="color: #458; font-weight: 600;">A28</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A28</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA28</span> <span class="kt" style="color: #458; font-weight: 600;">A29</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A29</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA29</span> <span class="kt" style="color: #458; font-weight: 600;">A30</span></span>
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<td class="diff-line-num new new_line" data-linenumber="42" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A30</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA30</span> <span class="kt" style="color: #458; font-weight: 600;">A1</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="44" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A2</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A1</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA1</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="45" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A3</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A2</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA2</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="46" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A4</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A3</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA3</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="47" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A5</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A4</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA4</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="48" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A6</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A5</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA5</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="49" 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">
49
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A7</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A6</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA6</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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50
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A8</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A7</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA7</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="51" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A9</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A8</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA8</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="52" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A10</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A9</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA9</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="53" 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">
53
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A11</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A10</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA10</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="54" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A12</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A11</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA11</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="55" 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">
55
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A13</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A12</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA12</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="56" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
56
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A14</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A13</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA13</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="57" 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">
57
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A15</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A14</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA14</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="58" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
58
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A16</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A15</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA15</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="59" 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">
59
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A17</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A16</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA16</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="60" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
60
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A18</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A17</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA17</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="61" 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">
61
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A19</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A18</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA18</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="62" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
62
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A20</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A19</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA19</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="63" 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">
63
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A21</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A20</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA20</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="64" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
64
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A22</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A21</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA21</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="65" 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">
65
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A23</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A22</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA22</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="66" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
66
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A24</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A23</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA23</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="67" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
67
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A25</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A24</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA24</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="68" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
68
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A26</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A25</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA25</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A27</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A26</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA26</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A28</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A27</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA27</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A29</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A28</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA28</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A30</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A29</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA29</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A1</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A30</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">get</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkA30</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">foo</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#fd4a0b65d74153aed8b33b01a04eb3ff7442cd45"><strong>testsuite/tests/perf/compiler/all.T</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">@@ -393,6 +393,13 @@ test ('T15164',</td>
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<pre style="margin: 0;"> <span id="LC393" class="line" lang="perl"> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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394
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<pre style="margin: 0;"> <span id="LC394" class="line" lang="perl"> <span class="p">[</span><span class="s" style="color: #d14;">'-v0 -O'</span><span class="p">])</span></span>
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395
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<pre style="margin: 0;"> <span id="LC395" class="line" lang="perl"></span>
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<pre style="margin: 0;">+<span id="LC396" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># See https://gitlab.haskell.org/ghc/ghc/merge_requests/312#note_186960</span></span>
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<pre style="margin: 0;">+<span id="LC397" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span> <span class="p">(</span><span class="s" style="color: #d14;">'WWRec'</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC398" class="line" lang="perl"> <span class="p">[</span> <span class="nv" style="color: #008080;">collect_compiler_stats</span><span class="p">(</span><span class="s" style="color: #d14;">'bytes allocated'</span><span class="p">,</span><span class="mi" style="color: #099;">10</span><span class="p">)</span></span>
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399
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<pre style="margin: 0;">+<span id="LC399" class="line" lang="perl"> <span class="p">],</span></span>
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<pre style="margin: 0;">+<span id="LC400" class="line" lang="perl"> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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401
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<pre style="margin: 0;">+<span id="LC401" class="line" lang="perl"> <span class="p">[</span><span class="s" style="color: #d14;">'-v0 -O'</span><span class="p">])</span></span>
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402
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<pre style="margin: 0;">+<span id="LC402" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC403" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16190'</span><span class="p">,</span></span>
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397
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404
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<pre style="margin: 0;"> <span id="LC404" class="line" lang="perl"> <span class="nv" style="color: #008080;">collect_stats</span><span class="p">(),</span></span>
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<pre style="margin: 0;"> <span id="LC405" class="line" lang="perl"> <span class="nv" style="color: #008080;">multimod_compile</span><span class="p">,</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#d340c7223099c3ed32a01d70b28784e163dcc29a"><strong>testsuite/tests/stranal/sigs/NewtypeArity.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cd">-- | 't' and 't2' should have a strictness signature for arity 2 here.</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Test</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">t2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">t2</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="p">(</span><span class="o" style="font-weight: 600;">+</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#e2b576f65c5d2bcf64ff0e18ec6110196b219762"><strong>testsuite/tests/stranal/sigs/NewtypeArity.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">==================== Strictness signatures ====================</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">Test.$tc'MkT: m</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">Test.$tcT: m</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">Test.$trModule: m</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">Test.t: <S,1*U(U)><S,1*U(U)>m</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">Test.t2: <S,1*U(U)><S,1*U(U)>m</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">==================== Strictness signatures ====================</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">Test.$tc'MkT: m</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">Test.$tcT: m</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">Test.$trModule: m</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext">Test.t: <S,1*U(U)><S,1*U(U)>m</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext">Test.t2: <S,1*U(U)><S,1*U(U)>m</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/014ed644eea9037427c1ebeaac16189b00f9dbc7#6cd3b38f9f19c00c9fb48ff8a444f1534e54ad95"><strong>testsuite/tests/stranal/sigs/all.T</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">@@ -17,3 +17,4 @@ test('BottomFromInnerLambda', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'DmdAnalGADTs'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T12370'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'CaseBinderCPR'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'NewtypeArity'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span></pre>
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