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<h3>
Simon Peyton Jones pushed to branch wip/T18328
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/21c1044528b64c1fbedc70c8fee3973a3543d8c8">21c10445</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-29T23:14:06+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve eta-expansion using ArityType
As #18355 shows, we were failing to preserve one-shot info when
eta-expanding. It's rather easy to fix, by using ArityType more,
rather than just Arity.
This patch is important to suport the one-shot monad trick;
see #18202. But the extra tracking of one-shot-ness requires
the patch
Define multiShotIO and use it in mkSplitUniqueSupply
If that patch is missing, ths patch makes things worse in
GHC.Types.Uniq.Supply. With it, however, we see these improvements
T3064 compiler bytes allocated -2.2%
T3294 compiler bytes allocated -1.3%
T12707 compiler bytes allocated -1.3%
T13056 compiler bytes allocated -2.2%
Metric decrease
T3064
T3294
T12707
T13056
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69fd77a3675a402004a1775c1932a388678c3b7a">69fd77a3</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-29T23:16:04+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use dumpStyle when printing inlinings
This just makes debug-printing consistent,
and more informative.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5c576e73381f677a6f3a0fd13aca6d61360ac880">5c576e73</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-29T23:16:04+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments only
</pre>
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<h4>7 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
compiler/GHC/Core/Opt/Arity.hs
</a>
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<li class="file-stats">
<a href="#f168a93cde5e2aec2441d6331dfe500172df4af3">
compiler/GHC/Core/Opt/Simplify.hs
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<li class="file-stats">
<a href="#48fbb5cdea308650de5756521feb28ec68819b9b">
compiler/GHC/Core/Opt/Simplify/Utils.hs
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<li class="file-stats">
<a href="#81707f1fe21087531cefd70879aa09c2be5c1d22">
compiler/GHC/Tc/Solver/Flatten.hs
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<li class="file-stats">
<a href="#3546a27dca8d24e385baf522ae17a6279b777b07">
<span class="new-file">
+
testsuite/tests/simplCore/should_compile/T18355.hs
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<li class="file-stats">
<a href="#567031a571455045b61cacbcb7f3806ae34cd4f6">
<span class="new-file">
+
testsuite/tests/simplCore/should_compile/T18355.stderr
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<li class="file-stats">
<a href="#fc07c260b75644727a8cdc1af5c861a44d4bfb5e">
testsuite/tests/simplCore/should_compile/all.T
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<h4>Changes:</h4>
<li id="c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5585c72bd9ca1419e49c524ab6a6d08726626a7d...5c576e73381f677a6f3a0fd13aca6d61360ac880#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999"><strong>compiler/GHC/Core/Opt/Arity.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="13" 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">@@ -13,9 +13,12 @@</td>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="cd">-- | Arity and eta expansion</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Core.Opt.Arity</span></span>
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<td class="diff-line-num old_line" data-linenumber="15" 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="LC15" class="line" lang="haskell"> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">manifestArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">joinRhsArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">typeArity</span></span>
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<td class="diff-line-num old old_line" data-linenumber="16" 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="LC16" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprEtaExpandArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">findRhsArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpand</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprEtaExpandArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">findRhsArity</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpand</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandAT</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandToJoinPoint</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandToJoinPointRule</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprBotStrictness_maybe</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</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;">expandableArityType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">arityTypeArity</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">maxWithArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isBotArityType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">idArityType</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="42" 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">@@ -42,7 +45,7 @@ import GHC.Types.Unique</td>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GeneralFlag</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;">gopt</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.FastString</span></span>
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<pre style="margin: 0;">-<span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">debugIsOn</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">lengthAtLeast</span></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="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC51" 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">@@ -486,8 +489,11 @@ Then f :: AT [False,False] ATop</td>
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<pre style="margin: 0;"> <span id="LC489" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------- Main arity code ----------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC490" 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="LC491" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC489" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [ArityType]</span></span>
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<pre style="margin: 0;">-<span id="LC490" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">OneShotInfo</span><span class="p">]</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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<pre style="margin: 0;">+<span id="LC492" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [ArityType]</span></span>
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<pre style="margin: 0;">+<span id="LC494" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">[</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="LC495" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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<pre style="margin: 0;">+<span id="LC496" 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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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- There is always an explicit lambda</span></span>
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to justify the [OneShot], or the Arity</span></span>
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<pre style="margin: 0;"> <span id="LC499" 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">@@ -495,18 +501,45 @@ instance Outputable ArityType where</td>
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<pre style="margin: 0;"> <span id="LC501" 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;">ATop</span> <span class="n" style="color: #333;">os</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;">"ATop"</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="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">os</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC502" 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;">ABot</span> <span class="n" style="color: #333;">n</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;">"ABot"</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;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC503" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"><span class="n" style="color: #333;">arityTypeArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</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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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The number of value args for the arity type</span></span>
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506
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<pre style="margin: 0;">+<span id="LC506" class="line" lang="haskell"><span class="n" style="color: #333;">arityTypeArity</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">oss</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;">oss</span></span>
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507
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<pre style="margin: 0;">+<span id="LC507" class="line" lang="haskell"><span class="n" style="color: #333;">arityTypeArity</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">ar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ar</span></span>
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508
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<pre style="margin: 0;">+<span id="LC508" class="line" lang="haskell"></span>
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509
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<pre style="margin: 0;">+<span id="LC509" class="line" lang="haskell"><span class="n" style="color: #333;">expandableArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</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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510
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<pre style="margin: 0;">+<span id="LC510" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True <=> eta-expansion will add at least one lambda</span></span>
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511
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<pre style="margin: 0;">+<span id="LC511" class="line" lang="haskell"><span class="n" style="color: #333;">expandableArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">oss</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;">null</span> <span class="n" style="color: #333;">oss</span><span class="p">)</span></span>
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512
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<pre style="margin: 0;">+<span id="LC512" class="line" lang="haskell"><span class="n" style="color: #333;">expandableArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">ar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ar</span> <span class="o" style="font-weight: 600;">/=</span> <span class="mi" style="color: #099;">0</span></span>
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513
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<pre style="margin: 0;">+<span id="LC513" class="line" lang="haskell"></span>
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514
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<pre style="margin: 0;">+<span id="LC514" class="line" lang="haskell"><span class="n" style="color: #333;">isBotArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</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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515
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<pre style="margin: 0;">+<span id="LC515" class="line" lang="haskell"><span class="n" style="color: #333;">isBotArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</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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516
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<pre style="margin: 0;">+<span id="LC516" class="line" lang="haskell"><span class="n" style="color: #333;">isBotArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</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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517
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<pre style="margin: 0;">+<span id="LC517" class="line" lang="haskell"></span>
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518
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<pre style="margin: 0;">+<span id="LC518" class="line" lang="haskell"><span class="n" style="color: #333;">arityTypeOneShots</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">OneShotInfo</span><span class="p">]</span></span>
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519
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<pre style="margin: 0;">+<span id="LC519" class="line" lang="haskell"><span class="n" style="color: #333;">arityTypeOneShots</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">oss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">oss</span></span>
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520
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<pre style="margin: 0;">+<span id="LC520" class="line" lang="haskell"><span class="n" style="color: #333;">arityTypeOneShots</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">ar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">ar</span> <span class="kt" style="color: #458; font-weight: 600;">OneShotLam</span></span>
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521
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If we are diveging or throwing an exception anyway</span></span>
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522
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<pre style="margin: 0;">+<span id="LC522" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- it's fine to push redexes inside the lambdas</span></span>
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523
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<pre style="margin: 0;">+<span id="LC523" class="line" lang="haskell"></span>
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524
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<pre style="margin: 0;">+<span id="LC524" class="line" lang="haskell"><span class="n" style="color: #333;">botArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;">+<span id="LC525" class="line" lang="haskell"><span class="n" style="color: #333;">botArityType</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="mi" style="color: #099;">0</span> <span class="c1" style="color: #998; font-style: italic;">-- Unit for andArityType</span></span>
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell"><span class="n" style="color: #333;">maxWithArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</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;">ArityType</span></span>
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<pre style="margin: 0;">+<span id="LC528" class="line" lang="haskell"><span class="n" style="color: #333;">maxWithArity</span> <span class="n" style="color: #333;">at</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="p">{})</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">at</span></span>
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529
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="haskell"><span class="n" style="color: #333;">maxWithArity</span> <span class="n" style="color: #333;">at</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">oss</span><span class="p">)</span> <span class="n" style="color: #333;">ar</span></span>
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">oss</span> <span class="p">`</span><span class="n" style="color: #333;">lengthAtLeast</span><span class="p">`</span> <span class="n" style="color: #333;">ar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">at</span></span>
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<pre style="margin: 0;">+<span id="LC531" 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;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">take</span> <span class="n" style="color: #333;">ar</span> <span class="p">(</span><span class="n" style="color: #333;">oss</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">repeat</span> <span class="kt" style="color: #458; font-weight: 600;">NoOneShotInfo</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC533" class="line" lang="haskell"><span class="n" style="color: #333;">vanillaArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;"> <span id="LC534" class="line" lang="haskell"><span class="n" style="color: #333;">vanillaArityType</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="c1" style="color: #998; font-style: italic;">-- Totally uninformative</span></span>
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<pre style="margin: 0;"> <span id="LC535" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ The Arity returned is the number of value args the</span></span>
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<pre style="margin: 0;"> <span id="LC537" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- expression can be applied to without doing much work</span></span>
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<pre style="margin: 0;">-<span id="LC503" class="line" lang="haskell"><span class="n" style="color: #333;">exprEtaExpandArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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<pre style="margin: 0;">+<span id="LC538" class="line" lang="haskell"><span class="n" style="color: #333;">exprEtaExpandArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity<span class="idiff left right">Type</span></span></span>
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<pre style="margin: 0;"> <span id="LC539" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- exprEtaExpandArity is used when eta expanding</span></span>
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<pre style="margin: 0;"> <span id="LC540" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- e ==> \xy -> e x y</span></span>
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="haskell"><span class="n" style="color: #333;">exprEtaExpandArity</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">-<span id="LC507" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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508
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<pre style="margin: 0;">-<span id="LC508" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">oss</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">oss</span></span>
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509
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<pre style="margin: 0;">-<span id="LC509" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC543" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC544" class="line" lang="haskell"> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AE</span> <span class="p">{</span> <span class="n" style="color: #333;">ae_cheap_fn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mk_cheap_fn</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">isCheapApp</span></span>
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512
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<pre style="margin: 0;"> <span id="LC545" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ae_ped_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_PedanticBottoms</span> <span class="n" style="color: #333;">dflags</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">@@ -529,7 +562,7 @@ mk_cheap_fn dflags cheap_app</td>
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<pre style="margin: 0;"> <span id="LC562" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC563" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC564" 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="LC532" class="line" lang="haskell"><span class="n" style="color: #333;">findRhsArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">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;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Arity</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">Bool</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="haskell"><span class="n" style="color: #333;">findRhsArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">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;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">ArityType</span></span></span>
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This implements the fixpoint loop for arity analysis</span></span>
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Arity analysis]</span></span>
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If findRhsArity e = (n, is_bot) then</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">@@ -543,44 +576,34 @@ findRhsArity dflags bndr rhs old_arity</td>
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we stop right away (since arities should not decrease)</span></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;">-- Result: the common case is that there is just one iteration</span></span>
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC546" class="line" lang="haskell"> <span class="n" style="color: #333;">is_lam</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">has_lam</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC547" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC548" class="line" lang="haskell"> <span class="n" style="color: #333;">has_lam</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tick</span> <span class="kr" style="font-weight: 600;">_</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;">has_lam</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">-<span id="LC549" class="line" lang="haskell"> <span class="n" style="color: #333;">has_lam</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">b</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;">isId</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">has_lam</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">-<span id="LC550" class="line" lang="haskell"> <span class="n" style="color: #333;">has_lam</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="LC551" class="line" lang="haskell"></span>
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579
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="haskell"> <span class="n" style="color: #333;">init_cheap_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CheapAppFun</span></span>
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580
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="haskell"> <span class="n" style="color: #333;">init_cheap_app</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">n_val_args</span></span>
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581
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">fn</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- On the first pass, this binder gets infinite arity</span></span>
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582
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<pre style="margin: 0;"> <span id="LC582" 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;">isCheapApp</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">n_val_args</span></span>
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556
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583
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC557" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Arity</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">Bool</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Arity</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">Bool</span></span><span class="p"><span class="idiff right">)</span></span></span>
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558
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<pre style="margin: 0;">-<span id="LC558" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">cur_<span class="idiff left">info</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">cur_arity</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kr" 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="LC559" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">cur_arity</span> <span class="o" style="font-weight: 600;"><=</span> <span class="n" style="color: #333;">old_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cur_<span class="idiff left right">info</span></span></span>
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<pre style="margin: 0;">-<span id="LC560" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">new_a<span class="idiff left">rity</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">==</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cur_arity</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cur_info</span></span></span>
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561
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<pre style="margin: 0;">-<span id="LC561" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span><span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ASSERT</span></span><span class="p"><span class="idiff">(</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">new_arity</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cur_arity</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">)</span></span></span>
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584
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<pre style="margin: 0;">+<span id="LC584" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">ArityType</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">ArityType</span></span></span>
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585
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">cur_<span class="idiff left right">atype</span></span></span>
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586
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">cur_arity</span> <span class="o" style="font-weight: 600;"><=</span> <span class="n" style="color: #333;">old_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cur_<span class="idiff left right">atype</span></span></span>
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587
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<pre style="margin: 0;">+<span id="LC587" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">new_a<span class="idiff left">type</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">==</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cur_atype</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cur_atype</span></span></span>
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<pre style="margin: 0;">+<span id="LC588" 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>
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<pre style="margin: 0;"> <span id="LC589" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">defined</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DEBUG</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;">pprTrace</span> <span class="s" style="color: #d14;">"Exciting arity"</span></span>
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<pre style="margin: 0;">-<span id="LC564" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">bndr</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cur_a<span class="idiff left">rity</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">new_arity</span></span></span>
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591
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<pre style="margin: 0;">+<span id="LC591" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">bndr</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cur_a<span class="idiff left">type</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">new_atype</span></span></span>
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565
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592
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<pre style="margin: 0;"> <span id="LC592" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs</span><span class="p">])</span></span>
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566
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593
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<pre style="margin: 0;"> <span id="LC593" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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567
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<pre style="margin: 0;">-<span id="LC567" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">new_<span class="idiff left right">info</span></span></span>
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594
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<pre style="margin: 0;">+<span id="LC594" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">new_<span class="idiff left right">atype</span></span></span>
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568
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595
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<pre style="margin: 0;"> <span id="LC595" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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569
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<td class="diff-line-num new_line old" data-linenumber="596" 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="LC569" class="line" lang="haskell"> <span class="n" style="color: #333;">new_<span class="idiff left">info</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">new_arity</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">get_arity</span> <span class="n" style="color: #333;">cheap_app</span></span>
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596
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<pre style="margin: 0;">+<span id="LC596" class="line" lang="haskell"> <span class="n" style="color: #333;">new_<span class="idiff left right">atype</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">get_arity</span> <span class="n" style="color: #333;">cheap_app</span></span>
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570
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597
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<pre style="margin: 0;"> <span id="LC597" class="line" lang="haskell"></span>
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598
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<pre style="margin: 0;">+<span id="LC598" class="line" lang="haskell"> <span class="n" style="color: #333;">cur_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arityTypeArity</span> <span class="n" style="color: #333;">cur_atype</span></span>
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571
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599
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<pre style="margin: 0;"> <span id="LC599" class="line" lang="haskell"> <span class="n" style="color: #333;">cheap_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CheapAppFun</span></span>
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572
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600
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<pre style="margin: 0;"> <span id="LC600" class="line" lang="haskell"> <span class="n" style="color: #333;">cheap_app</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">n_val_args</span></span>
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573
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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="n" style="color: #333;">fn</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">n_val_args</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">cur_arity</span></span>
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574
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602
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<pre style="margin: 0;"> <span id="LC602" 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;">isCheapApp</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">n_val_args</span></span>
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575
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603
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<pre style="margin: 0;"> <span id="LC603" class="line" lang="haskell"></span>
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576
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<pre style="margin: 0;">-<span id="LC576" class="line" lang="haskell"> <span class="n" style="color: #333;">get_arity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CheapAppFun</span> <span class="o" style="font-weight: 600;">-></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>
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577
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<pre style="margin: 0;">-<span id="LC577" class="line" lang="haskell"> <span class="n" style="color: #333;">get_arity</span> <span class="n" style="color: #333;">cheap_app</span></span>
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578
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<pre style="margin: 0;">-<span id="LC578" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</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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579
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<pre style="margin: 0;">-<span id="LC579" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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580
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<pre style="margin: 0;">-<span id="LC580" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">os</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">oss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isOneShotInfo</span> <span class="n" style="color: #333;">os</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">is_lam</span></span>
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<pre style="margin: 0;">-<span id="LC581" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">oss</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Don't expand PAPs/thunks</span></span>
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<pre style="margin: 0;">-<span id="LC582" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [Eta expanding thunks]</span></span>
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<pre style="margin: 0;">-<span id="LC583" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"> <span class="n" style="color: #333;">get_arity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CheapAppFun</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"> <span class="n" style="color: #333;">get_arity</span> <span class="n" style="color: #333;">cheap_app</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs</span></span>
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606
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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607
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<pre style="margin: 0;"> <span id="LC607" class="line" lang="haskell"> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AE</span> <span class="p">{</span> <span class="n" style="color: #333;">ae_cheap_fn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mk_cheap_fn</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">cheap_app</span></span>
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585
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608
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ae_ped_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_PedanticBottoms</span> <span class="n" style="color: #333;">dflags</span></span>
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586
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609
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ae_joins</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyVarSet</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">@@ -613,7 +636,6 @@ write the analysis loop.</td>
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The analysis is cheap-and-cheerful because it doesn't deal with</span></span>
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<pre style="margin: 0;"> <span id="LC637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">mutual recursion. But the self-recursive case is the important one.</span></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC616" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Eta expanding through dictionaries]</span></span>
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<pre style="margin: 0;"> <span id="LC640" 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="LC641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If the experimental -fdicts-cheap flag is on, we eta-expand through</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">@@ -632,24 +654,6 @@ The (foo DInt) is floated out, and makes ineffective a RULE</td>
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<pre style="margin: 0;"> <span id="LC654" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC655" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">One could go further and make exprIsCheap reply True to any</span></span>
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<pre style="margin: 0;"> <span id="LC656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dictionary-typed expression, but that's more work.</span></span>
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<pre style="margin: 0;">-<span id="LC635" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Eta expanding thunks]</span></span>
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<pre style="margin: 0;">-<span id="LC637" 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="LC638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We don't eta-expand</span></span>
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<pre style="margin: 0;">-<span id="LC639" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Trivial RHSs x = y</span></span>
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<pre style="margin: 0;">-<span id="LC640" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * PAPs x = map g</span></span>
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<pre style="margin: 0;">-<span id="LC641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Thunks f = case y of p -> \x -> blah</span></span>
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<pre style="margin: 0;">-<span id="LC642" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC643" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we see</span></span>
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<pre style="margin: 0;">-<span id="LC644" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = case y of p -> \x -> blah</span></span>
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<pre style="margin: 0;">-<span id="LC645" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">should we eta-expand it? Well, if 'x' is a one-shot state token</span></span>
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<pre style="margin: 0;">-<span id="LC646" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then 'yes' because 'f' will only be applied once. But otherwise</span></span>
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<pre style="margin: 0;">-<span id="LC647" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we (conservatively) say no. My main reason is to avoid expanding</span></span>
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<pre style="margin: 0;">-<span id="LC648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">PAPSs</span></span>
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<pre style="margin: 0;">-<span id="LC649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = g d ==> f = \x. g d x</span></span>
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<pre style="margin: 0;">-<span id="LC650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">because that might in turn make g inline (if it has an inline pragma),</span></span>
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<pre style="margin: 0;">-<span id="LC651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which we might not want. After all, INLINE pragmas say "inline only</span></span>
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<pre style="margin: 0;">-<span id="LC652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">when saturated" so we don't want to be too gung-ho about saturating!</span></span>
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<pre style="margin: 0;"> <span id="LC657" 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="LC658" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell"><span class="n" style="color: #333;">arityLam</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;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</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">@@ -673,6 +677,7 @@ arityApp (ATop []) _ = ATop []</td>
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<pre style="margin: 0;"> <span id="LC677" class="line" lang="haskell"><span class="n" style="color: #333;">arityApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">as</span><span class="p">))</span> <span class="n" style="color: #333;">cheap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">floatIn</span> <span class="n" style="color: #333;">cheap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">as</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC678" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC679" class="line" lang="haskell"><span class="n" style="color: #333;">andArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="c1" style="color: #998; font-style: italic;">-- Used for branches of a 'case'</span></span>
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is least upper bound in the ArityType lattice</span></span>
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<pre style="margin: 0;"> <span id="LC681" class="line" lang="haskell"><span class="n" style="color: #333;">andArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">n1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">n2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="p">(</span><span class="n" style="color: #333;">n1</span> <span class="p">`</span><span class="n" style="color: #333;">max</span><span class="p">`</span> <span class="n" style="color: #333;">n2</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [ABot branches: use max]</span></span>
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<pre style="margin: 0;"> <span id="LC682" class="line" lang="haskell"><span class="n" style="color: #333;">andArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">as</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</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;">ATop</span> <span class="n" style="color: #333;">as</span></span>
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<pre style="margin: 0;"> <span id="LC683" class="line" lang="haskell"><span class="n" style="color: #333;">andArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">bs</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">@@ -754,8 +759,7 @@ arityType :: ArityEnv -> CoreExpr -> ArityType</td>
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<pre style="margin: 0;"> <span id="LC759" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC760" class="line" lang="haskell"><span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</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="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC761" 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;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC757" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">os</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">take</span> <span class="n" style="color: #333;">co_arity</span> <span class="n" style="color: #333;">os</span><span class="p">)</span></span>
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758
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<pre style="margin: 0;">-<span id="LC758" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Arity trimming]</span></span>
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">os</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">take</span> <span class="n" style="color: #333;">co_arity</span> <span class="n" style="color: #333;">os</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Arity trimming]</span></span>
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<pre style="margin: 0;"> <span id="LC763" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">co_arity</span> <span class="o" style="font-weight: 600;"><</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;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">co_arity</span> <span class="n" style="color: #333;">noOneShotInfo</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC764" 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;">ABot</span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;"> <span id="LC765" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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">@@ -769,19 +773,9 @@ arityType env (Cast e co)</td>
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<pre style="margin: 0;"> <span id="LC773" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC774" class="line" lang="haskell"><span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC775" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">v</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">ae_joins</span> <span class="n" style="color: #333;">env</span></span>
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<pre style="margin: 0;">-<span id="LC772" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="mi" style="color: #099;">0</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Eta-expansion and join points]</span></span>
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<pre style="margin: 0;">-<span id="LC773" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC774" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">strict_sig</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">idStrictness</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">-<span id="LC775" class="line" lang="haskell"> <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;">isTopSig</span> <span class="n" style="color: #333;">strict_sig</span></span>
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<pre style="margin: 0;">-<span id="LC776" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">ds</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitStrictSig</span> <span class="n" style="color: #333;">strict_sig</span></span>
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<pre style="margin: 0;">-<span id="LC777" 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;">ds</span></span>
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778
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<pre style="margin: 0;">-<span id="LC778" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isDeadEndDiv</span> <span class="n" style="color: #333;">res</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">arity</span></span>
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779
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<pre style="margin: 0;">-<span id="LC779" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">take</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">one_shots</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC776" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">botArityType</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Eta-expansion and join points]</span></span>
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<pre style="margin: 0;"> <span id="LC777" 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="LC781" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">take</span> <span class="p">(</span><span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="n" style="color: #333;">one_shots</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC782" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC783" class="line" lang="haskell"> <span class="n" style="color: #333;">one_shots</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</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;">-- One-shot-ness derived from the type</span></span>
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784
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<pre style="margin: 0;">-<span id="LC784" class="line" lang="haskell"> <span class="n" style="color: #333;">one_shots</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">typeArity</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idArityType</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC780" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Lambdas; increase arity</span></span>
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="haskell"><span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -804,13 +798,13 @@ arityType env (App fun arg )</td>
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<pre style="margin: 0;"> <span id="LC798" 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="LC799" class="line" lang="haskell"><span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Case</span> <span class="n" style="color: #333;">scrut</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">alts</span><span class="p">)</span></span>
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806
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800
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<pre style="margin: 0;"> <span id="LC800" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">exprIsDeadEnd</span> <span class="n" style="color: #333;">scrut</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">alts</span></span>
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<pre style="margin: 0;">-<span id="LC807" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">ABot</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">0</span></span><span class="idiff right"> </span> <span class="c1" style="color: #998; font-style: italic;">-- Do not eta expand</span></span>
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<pre style="margin: 0;">-<span id="LC808" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Dealing with bottom (1)]</span></span>
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<pre style="margin: 0;">+<span id="LC801" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">botArityType</span></span> <span class="c1" style="color: #998; font-style: italic;">-- Do not eta expand</span></span>
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<pre style="margin: 0;">+<span id="LC802" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- See Note [Dealing with bottom (1)]</span></span>
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<pre style="margin: 0;"> <span id="LC803" 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="LC804" 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;">alts_type</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC811" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span><span class="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;">ATop</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="c1" style="color: #998; font-style: italic;">-- Don't eta expand</span></span>
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812
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<pre style="margin: 0;">-<span id="LC812" 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;"><span class="idiff left">ABot</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">0</span></span><span class="idiff right"> </span> <span class="c1" style="color: #998; font-style: italic;">-- if RHS is bottomming</span></span>
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813
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<pre style="margin: 0;">-<span id="LC813" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Dealing with bottom (2)]</span></span>
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<pre style="margin: 0;">+<span id="LC805" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span><span class="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;">ATop</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- Don't eta expand</span></span>
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<pre style="margin: 0;">+<span id="LC806" 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;"><span class="idiff left right">botArityType</span></span> <span class="c1" style="color: #998; font-style: italic;">-- if RHS is bottomming</span></span>
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<pre style="margin: 0;">+<span id="LC807" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- See Note [Dealing with bottom (2)]</span></span>
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC809" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">as</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;">ae_ped_bot</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Dealing with bottom (3)]</span></span>
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<pre style="margin: 0;"> <span id="LC810" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ae_cheap_fn</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">scrut</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">as</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -886,7 +880,8 @@ So we do this:</td>
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<pre style="margin: 0;"> <span id="LC880" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> body of the let.</span></span>
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<pre style="margin: 0;"> <span id="LC881" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Dually, when we come to a /call/ of a join point, just no-op</span></span>
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<pre style="margin: 0;">-<span id="LC889" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> by returning (ABot 0), the neutral element of ArityType.</span></span>
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> by returning botArityType, the bottom element of ArityType,</span></span>
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> which so that: bot `andArityType` x = x</span></span>
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<pre style="margin: 0;"> <span id="LC885" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* This works if the join point is bound in the expression we are</span></span>
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<pre style="margin: 0;"> <span id="LC887" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> taking the arityType of. But if it's bound further out, it makes</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">@@ -905,6 +900,20 @@ An alternative (roughly equivalent) idea would be to carry an</td>
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<pre style="margin: 0;"> <span id="LC900" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">environment mapping let-bound Ids to their ArityType.</span></span>
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<pre style="margin: 0;"> <span id="LC901" 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="LC902" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC903" class="line" lang="haskell"><span class="n" style="color: #333;">idArityType</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;">ArityType</span></span>
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<pre style="margin: 0;">+<span id="LC904" class="line" lang="haskell"><span class="n" style="color: #333;">idArityType</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">+<span id="LC905" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">strict_sig</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">idStrictness</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">+<span id="LC906" class="line" lang="haskell"> <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;">isTopSig</span> <span class="n" style="color: #333;">strict_sig</span></span>
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<pre style="margin: 0;">+<span id="LC907" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">ds</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitStrictSig</span> <span class="n" style="color: #333;">strict_sig</span></span>
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<pre style="margin: 0;">+<span id="LC908" 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;">ds</span></span>
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909
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<pre style="margin: 0;">+<span id="LC909" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isDeadEndDiv</span> <span class="n" style="color: #333;">res</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">arity</span></span>
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<pre style="margin: 0;">+<span id="LC910" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">take</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">one_shots</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC911" 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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912
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<pre style="margin: 0;">+<span id="LC912" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">take</span> <span class="p">(</span><span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="n" style="color: #333;">one_shots</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC913" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC914" class="line" lang="haskell"> <span class="n" style="color: #333;">one_shots</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</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;">-- One-shot-ness derived from the type</span></span>
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<pre style="margin: 0;">+<span id="LC915" class="line" lang="haskell"> <span class="n" style="color: #333;">one_shots</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">typeArity</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC916" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC918" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>
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919
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<pre style="margin: 0;"> <span id="LC919" 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">@@ -1001,6 +1010,25 @@ which we want to lead to code like</td>
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1001
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1010
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<pre style="margin: 0;"> <span id="LC1010" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This means that we need to look through type applications and be ready</span></span>
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1002
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1011
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<pre style="margin: 0;"> <span id="LC1011" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to re-add floats on the top.</span></span>
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1003
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1012
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<pre style="margin: 0;"> <span id="LC1012" class="line" lang="haskell"></span>
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1013
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<pre style="margin: 0;">+<span id="LC1013" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Eta expansion with ArityType]</span></span>
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1014
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<pre style="margin: 0;">+<span id="LC1014" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1015
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<pre style="margin: 0;">+<span id="LC1015" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The etaExpandAT function takes an ArityType (not just an Arity) to</span></span>
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1016
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<pre style="margin: 0;">+<span id="LC1016" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">guide eta-expansion. Why? Because we want to preserve one-shot info.</span></span>
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1017
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<pre style="margin: 0;">+<span id="LC1017" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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1018
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo = \x. case x of</span></span>
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1019
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> True -> (\s{os}. blah) |> co</span></span>
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1020
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<pre style="margin: 0;">+<span id="LC1020" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> False -> wubble</span></span>
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1021
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<pre style="margin: 0;">+<span id="LC1021" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We'll get an ArityType for foo of (ATop [NoOneShot,OneShot]).</span></span>
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1022
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"></span>
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1023
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then we want to eta-expand to</span></span>
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1024
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<pre style="margin: 0;">+<span id="LC1024" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo = \x. (\eta{os}. (case x of ...as before...) eta) |> some_co</span></span>
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1025
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<pre style="margin: 0;">+<span id="LC1025" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1026" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1026
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<pre style="margin: 0;">+<span id="LC1026" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That 'eta' binder is fresh, and we really want it to have the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1027" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1027
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<pre style="margin: 0;">+<span id="LC1027" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">one-shot flag from the inner \s{osf}. By expanding with the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1028" 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">
1028
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<pre style="margin: 0;">+<span id="LC1028" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ArityType gotten from analysing the RHS, we achieve this neatly.</span></span>
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1029
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<pre style="margin: 0;">+<span id="LC1029" class="line" lang="haskell"></span>
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1030
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<pre style="margin: 0;">+<span id="LC1030" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This makes a big difference to the one-shot monad trick;</span></span>
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1031
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<pre style="margin: 0;">+<span id="LC1031" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">see Note [The one-shot state monad trick] in GHC.Core.Unify.</span></span>
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1004
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1032
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<pre style="margin: 0;"> <span id="LC1032" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1005
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1033
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<pre style="margin: 0;"> <span id="LC1033" class="line" lang="haskell"></span>
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1006
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1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"><span class="cd">-- | @etaExpand n e@ returns an expression with</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">@@ -1013,11 +1041,16 @@ to re-add floats on the top.</td>
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1013
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We should have that:</span></span>
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1014
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1015
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1043
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > ty = exprType e = exprType e'</span></span>
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1016
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<pre style="margin: 0;">-<span id="LC1016" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpand</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Result should have this number of value args</span></span>
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1017
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<pre style="margin: 0;">-<span id="LC1017" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Expression to expand</span></span>
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<pre style="margin: 0;">-<span id="LC1018" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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1044
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<pre style="margin: 0;">+<span id="LC1044" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpand</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;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC1045" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpandAT</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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1046
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<pre style="margin: 0;">+<span id="LC1046" class="line" lang="haskell"></span>
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1047
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<pre style="margin: 0;">+<span id="LC1047" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpand</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">orig_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eta_expand</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">n</span> <span class="kt" style="color: #458; font-weight: 600;">NoOneShotInfo</span><span class="p">)</span> <span class="n" style="color: #333;">orig_expr</span></span>
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1048
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<pre style="margin: 0;">+<span id="LC1048" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpandAT</span> <span class="n" style="color: #333;">at</span> <span class="n" style="color: #333;">orig_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eta_expand</span> <span class="p">(</span><span class="n" style="color: #333;">arityTypeOneShots</span> <span class="n" style="color: #333;">at</span><span class="p">)</span> <span class="n" style="color: #333;">orig_expr</span></span>
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1049
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<pre style="margin: 0;">+<span id="LC1049" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Eta expansion with ArityType]</span></span>
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1050
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<pre style="margin: 0;">+<span id="LC1050" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1051" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- etaExpand arity e = res</span></span>
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1052
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<pre style="margin: 0;"> <span id="LC1052" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Then 'res' has at least 'arity' lambdas at the top</span></span>
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<pre style="margin: 0;">+<span id="LC1053" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Eta expansion with ArityType]</span></span>
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<pre style="margin: 0;"> <span id="LC1054" 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="LC1055" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- etaExpand deals with for-alls. For example:</span></span>
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1056
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<pre style="margin: 0;"> <span id="LC1056" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- etaExpand 1 E</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">@@ -1028,21 +1061,23 @@ etaExpand :: Arity -- ^ Result should have this number of value arg</td>
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<pre style="margin: 0;"> <span id="LC1061" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It deals with coerces too, though they are now rare</span></span>
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1062
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<pre style="margin: 0;"> <span id="LC1062" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- so perhaps the extra code isn't worth it</span></span>
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1030
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1063
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<pre style="margin: 0;"> <span id="LC1063" class="line" lang="haskell"></span>
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1031
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<pre style="margin: 0;">-<span id="LC1031" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpand</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">orig_expr</span></span>
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1032
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<td class="diff-line-num new_line old" data-linenumber="1064" 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="LC1032" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">orig_expr</span></span>
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1064
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<pre style="margin: 0;">+<span id="LC1064" class="line" lang="haskell"><span class="n" style="color: #333;">eta_expand</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">OneShotInfo</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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1065
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<pre style="margin: 0;">+<span id="LC1065" class="line" lang="haskell"><span class="n" style="color: #333;">eta_expand</span> <span class="n" style="color: #333;">one_shots</span> <span class="n" style="color: #333;">orig_expr</span></span>
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1066
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<pre style="margin: 0;">+<span id="LC1066" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">one_shots</span> <span class="n" style="color: #333;">orig_expr</span></span>
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1033
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1067
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<pre style="margin: 0;"> <span id="LC1067" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1034
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<td class="diff-line-num new_line" data-linenumber="1068" 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">
1068
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<pre style="margin: 0;"> <span id="LC1068" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Strip off existing lambdas and casts before handing off to mkEtaWW</span></span>
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1035
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1069
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<pre style="margin: 0;"> <span id="LC1069" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Eta expansion and SCCs]</span></span>
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1036
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<pre style="margin: 0;">-<span id="LC1036" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expr</span></span>
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1037
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<pre style="margin: 0;">-<span id="LC1037" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</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;">body</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="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">v</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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1038
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<pre style="margin: 0;">-<span id="LC1038" 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;">Lam</span> <span class="n" style="color: #333;">v</span> <span class="p">(</span><span class="n" style="color: #333;">go</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;">body</span><span class="p">)</span></span>
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1039
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<pre style="margin: 0;">-<span id="LC1039" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="n" style="color: #333;">co</span></span>
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1040
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<pre style="margin: 0;">-<span id="LC1040" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">expr</span></span>
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1070
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<pre style="margin: 0;">+<span id="LC1070" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expr</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1071" 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">
1071
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<pre style="margin: 0;">+<span id="LC1071" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">oss</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">oss1</span><span class="p">)</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;">body</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="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">v</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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1072
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<pre style="margin: 0;">+<span id="LC1072" 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;">Lam</span> <span class="n" style="color: #333;">v</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">oss1</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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1073
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<pre style="margin: 0;">+<span id="LC1073" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">oss</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="n" style="color: #333;">co</span></span>
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1074
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<pre style="margin: 0;">+<span id="LC1074" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">expr</span></span>
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1076
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<pre style="margin: 0;"> <span id="LC1076" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "ee" (vcat [ppr orig_expr, ppr expr, ppr etas]) $</span></span>
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1077
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<pre style="margin: 0;"> <span id="LC1077" class="line" lang="haskell"> <span class="n" style="color: #333;">retick</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">etaInfoAbs</span> <span class="n" style="color: #333;">etas</span> <span class="p">(</span><span class="n" style="color: #333;">etaInfoApp</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">sexpr</span> <span class="n" style="color: #333;">etas</span><span class="p">)</span></span>
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1043
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1078
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<pre style="margin: 0;"> <span id="LC1078" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1044
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<pre style="margin: 0;"> <span id="LC1079" class="line" lang="haskell"> <span class="n" style="color: #333;">in_scope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">exprFreeVars</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1045" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">in_scope'</span><span class="p">,</span> <span class="n" style="color: #333;">etas</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEtaWW</span> <span class="n" style="color: #333;"><span class="idiff left right">n</span></span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">orig_expr</span><span class="p">)</span> <span class="n" style="color: #333;">in_scope</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1080" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">in_scope'</span><span class="p">,</span> <span class="n" style="color: #333;">etas</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEtaWW</span> <span class="n" style="color: #333;"><span class="idiff left right">oss</span></span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">orig_expr</span><span class="p">)</span> <span class="n" style="color: #333;">in_scope</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"> <span class="n" style="color: #333;">subst'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEmptySubst</span> <span class="n" style="color: #333;">in_scope'</span></span>
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1047
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<pre style="margin: 0;"> <span id="LC1082" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1083" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Find ticks behind type apps.</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">@@ -1141,7 +1176,7 @@ etaInfoAppTy _ (EtaCo co : eis) = etaInfoAppTy (coercionRKind co) eis</td>
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<pre style="margin: 0;"> <span id="LC1176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- semantically-irrelevant source annotations, so call sites must take care to</span></span>
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<pre style="margin: 0;"> <span id="LC1177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- preserve that info. See Note [Eta expansion and SCCs].</span></span>
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1178
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<pre style="margin: 0;"> <span id="LC1178" class="line" lang="haskell"><span class="n" style="color: #333;">mkEtaWW</span></span>
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<pre style="margin: 0;">-<span id="LC1144" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Arity</span></span></span>
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<pre style="margin: 0;">+<span id="LC1179" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="p"><span class="idiff left">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">OneShotInfo</span></span><span class="p"><span class="idiff right">]</span></span></span>
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<pre style="margin: 0;"> <span id="LC1180" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ How many value arguments to eta-expand</span></span>
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<pre style="margin: 0;"> <span id="LC1181" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;"> <span id="LC1182" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The pretty-printed original expression, for warnings.</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">@@ -1153,36 +1188,29 @@ mkEtaWW</td>
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1153
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1188
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<pre style="margin: 0;"> <span id="LC1188" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The outgoing 'InScopeSet' extends the incoming 'InScopeSet' with the</span></span>
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1189
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<pre style="margin: 0;"> <span id="LC1189" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- fresh variables in 'EtaInfo'.</span></span>
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1155
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1190
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<pre style="margin: 0;"> <span id="LC1190" class="line" lang="haskell"></span>
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1156
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<pre style="margin: 0;">-<span id="LC1156" class="line" lang="haskell"><span class="n" style="color: #333;">mkEtaWW</span> <span class="n" style="color: #333;">orig_<span class="idiff left right">n</span></span> <span class="n" style="color: #333;">ppr_orig_expr</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">orig_ty</span></span>
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1157
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<pre style="margin: 0;">-<span id="LC1157" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;"><span class="idiff left right">orig_n</span></span> <span class="n" style="color: #333;">empty_subst</span> <span class="n" style="color: #333;">orig_ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1191
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<pre style="margin: 0;">+<span id="LC1191" class="line" lang="haskell"><span class="n" style="color: #333;">mkEtaWW</span> <span class="n" style="color: #333;">orig_<span class="idiff left right">oss</span></span> <span class="n" style="color: #333;">ppr_orig_expr</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">orig_ty</span></span>
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1192
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<pre style="margin: 0;">+<span id="LC1192" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;"><span class="idiff left">0</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">orig_oss</span></span> <span class="n" style="color: #333;">empty_subst</span> <span class="n" style="color: #333;">orig_ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1158
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1193
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<pre style="margin: 0;"> <span id="LC1193" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1159
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<td class="diff-line-num new_line" data-linenumber="1194" 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">
1194
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<pre style="margin: 0;"> <span id="LC1194" class="line" lang="haskell"> <span class="n" style="color: #333;">empty_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEmptyTCvSubst</span> <span class="n" style="color: #333;">in_scope</span></span>
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1160
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1195
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<pre style="margin: 0;"> <span id="LC1195" class="line" lang="haskell"></span>
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1161
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<pre style="margin: 0;">-<span id="LC1161" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span> <span class="c1" style="color: #998; font-style: italic;">-- Number of value args to expand to</span></span>
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1196
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<pre style="margin: 0;">+<span id="LC1196" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="c1" style="color: #998; font-style: italic;">-- For fresh names</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1197" 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">
1197
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<pre style="margin: 0;">+<span id="LC1197" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">OneShotInfo</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Number of value args to expand to</span></span>
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1162
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1198
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<pre style="margin: 0;"> <span id="LC1198" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- We are really looking at subst(ty)</span></span>
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1163
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1199
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<pre style="margin: 0;"> <span id="LC1199" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">EtaInfo</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Accumulating parameter</span></span>
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1164
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1200
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<pre style="margin: 0;"> <span id="LC1200" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InScopeSet</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">EtaInfo</span><span class="p">])</span></span>
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1165
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<td class="diff-line-num new_line old" data-linenumber="1201" 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="LC1165" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">eis</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [exprArity invariant]</span></span>
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1166
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<pre style="margin: 0;">-<span id="LC1166" class="line" lang="haskell"></span>
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1201
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<pre style="margin: 0;">+<span id="LC1201" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">subst</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">eis</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [exprArity invariant]</span></span>
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1167
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<td class="diff-line-num new_line" data-linenumber="1202" 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">
1202
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<pre style="margin: 0;"> <span id="LC1202" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">----------- Done! No more expansion needed</span></span>
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1168
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<td class="diff-line-num new_line old" data-linenumber="1203" 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="LC1168" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span></span>
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1169
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1203
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<pre style="margin: 0;"> <span id="LC1203" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">getTCvInScope</span> <span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span></span>
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1170
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1204
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<pre style="margin: 0;"> <span id="LC1204" class="line" lang="haskell"></span>
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1205
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<pre style="margin: 0;">+<span id="LC1205" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">oss</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">one_shot</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">oss1</span><span class="p">)</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">eis</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [exprArity invariant]</span></span>
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1171
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1206
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<pre style="margin: 0;"> <span id="LC1206" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">----------- Forall types (forall a. ty)</span></span>
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1172
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1207
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<pre style="margin: 0;"> <span id="LC1207" 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;">tcv</span><span class="p">,</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;">splitForAllTy_maybe</span> <span class="n" style="color: #333;">ty</span></span>
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1173
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<pre style="margin: 0;">-<span id="LC1173" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">tcv'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substVarBndr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tcv</span></span>
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1174
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<pre style="margin: 0;">-<span id="LC1174" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">((</span><span class="n" style="color: #333;">n_subst</span><span class="p">,</span> <span class="n" style="color: #333;">n_tcv</span><span class="p">),</span> <span class="n" style="color: #333;">n_n</span><span class="p">)</span></span>
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1175
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<pre style="margin: 0;">-<span id="LC1175" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We want to have at least 'n' lambdas at the top.</span></span>
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1176
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<pre style="margin: 0;">-<span id="LC1176" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If tcv is a tyvar, it corresponds to one Lambda (/\).</span></span>
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1177
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<pre style="margin: 0;">-<span id="LC1177" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- And we won't reduce n.</span></span>
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1178
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<pre style="margin: 0;">-<span id="LC1178" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If tcv is a covar, we could eta-expand the expr with one</span></span>
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1179
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<pre style="margin: 0;">-<span id="LC1179" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- lambda \co:ty. e co. In this case we generate a new variable</span></span>
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1180
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<pre style="margin: 0;">-<span id="LC1180" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of the coercion type, update the scope, and reduce n by 1.</span></span>
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1181
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<pre style="margin: 0;">-<span id="LC1181" 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;">tcv</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">((</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">tcv'</span><span class="p">),</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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1182
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<pre style="margin: 0;">-<span id="LC1182" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- covar case:</span></span>
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1183
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<pre style="margin: 0;">-<span id="LC1183" 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;">freshEtaId</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">subst'</span> <span class="p">(</span><span class="n" style="color: #333;">unrestricted</span> <span class="p">(</span><span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">tcv'</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>
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1184
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<pre style="margin: 0;">-<span id="LC1184" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Avoid free vars of the original expression</span></span>
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1185
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<pre style="margin: 0;">-<span id="LC1185" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n_n</span> <span class="n" style="color: #333;">n_subst</span> <span class="n" style="color: #333;">ty'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EtaVar</span> <span class="n" style="color: #333;">n_tcv</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span></span>
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1208
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<pre style="margin: 0;">+<span id="LC1208" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">tcv'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substVarBndr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tcv</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1209" 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">
1209
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<pre style="margin: 0;">+<span id="LC1209" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">oss'</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tcv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">oss</span></span>
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1210
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<pre style="margin: 0;">+<span id="LC1210" 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;">oss1</span></span>
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1211
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<pre style="margin: 0;">+<span id="LC1211" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- A forall can bind a CoVar, in which case</span></span>
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1212
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<pre style="margin: 0;">+<span id="LC1212" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we consume one of the [OneShotInfo]</span></span>
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1213
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<pre style="margin: 0;">+<span id="LC1213" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">oss'</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">ty'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EtaVar</span> <span class="n" style="color: #333;">tcv'</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span></span>
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1186
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1214
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<pre style="margin: 0;"> <span id="LC1214" class="line" lang="haskell"></span>
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1187
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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;">----------- Function types (t1 -> t2)</span></span>
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1188
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1216
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<pre style="margin: 0;"> <span id="LC1216" 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;">mult</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitFunTy_maybe</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1218" 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">@@ -1190,9 +1218,11 @@ mkEtaWW orig_n ppr_orig_expr in_scope orig_ty</td>
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1190
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1218
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<pre style="margin: 0;"> <span id="LC1218" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Levity polymorphism invariants] in GHC.Core</span></span>
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1191
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1219
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<pre style="margin: 0;"> <span id="LC1219" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See also test case typecheck/should_run/EtaExpandLevPoly</span></span>
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1192
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1220
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<pre style="margin: 0;"> <span id="LC1220" class="line" lang="haskell"></span>
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1193
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<pre style="margin: 0;">-<span id="LC1193" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">eta_id'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">freshEtaId</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="n" style="color: #333;">mult</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">)</span></span>
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1194
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<pre style="margin: 0;">-<span id="LC1194" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Avoid free vars of the original expression</span></span>
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1195
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<pre style="margin: 0;">-<span id="LC1195" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="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;">subst'</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EtaVar</span> <span class="n" style="color: #333;">eta_id'</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span></span>
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1221
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<pre style="margin: 0;">+<span id="LC1221" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">eta_id</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">freshEtaId</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="n" style="color: #333;">mult</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">)</span></span>
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1222
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<pre style="margin: 0;">+<span id="LC1222" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Avoid free vars of the original expression</span></span>
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1223
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<pre style="margin: 0;">+<span id="LC1223" class="line" lang="haskell"></span>
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1224
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<pre style="margin: 0;">+<span id="LC1224" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">eta_id'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eta_id</span> <span class="p">`</span><span class="n" style="color: #333;">setIdOneShotInfo</span><span class="p">`</span> <span class="n" style="color: #333;">one_shot</span></span>
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1225
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<pre style="margin: 0;">+<span id="LC1225" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="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;">oss1</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EtaVar</span> <span class="n" style="color: #333;">eta_id'</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span></span>
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1196
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1226
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<pre style="margin: 0;"> <span id="LC1226" class="line" lang="haskell"></span>
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1197
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1227
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<pre style="margin: 0;"> <span id="LC1227" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">----------- Newtypes</span></span>
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1198
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1228
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<pre style="margin: 0;"> <span id="LC1228" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Given this:</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">@@ -1206,12 +1236,12 @@ mkEtaWW orig_n ppr_orig_expr in_scope orig_ty</td>
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1236
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<pre style="margin: 0;"> <span id="LC1236" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Remember to apply the substitution to co (#16979)</span></span>
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1237
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<pre style="margin: 0;"> <span id="LC1237" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (or we could have applied to ty, but then</span></span>
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1238
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<pre style="margin: 0;"> <span id="LC1238" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we'd have had to zap it for the recursive call)</span></span>
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1209
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<pre style="margin: 0;">-<span id="LC1209" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty'</span> <span class="p">(</span><span class="n" style="color: #333;">pushCoercion</span> <span class="n" style="color: #333;">co'</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span></span>
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1239
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<pre style="margin: 0;">+<span id="LC1239" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left">oss</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty'</span> <span class="p">(</span><span class="n" style="color: #333;">pushCoercion</span> <span class="n" style="color: #333;">co'</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span></span>
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1210
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1240
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<pre style="margin: 0;"> <span id="LC1240" class="line" lang="haskell"></span>
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1211
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1241
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<pre style="margin: 0;"> <span id="LC1241" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- We have an expression of arity > 0,</span></span>
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1212
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1242
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<pre style="margin: 0;"> <span id="LC1242" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but its type isn't a function, or a binder</span></span>
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1213
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1243
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<pre style="margin: 0;"> <span id="LC1243" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is levity-polymorphic</span></span>
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1214
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<pre style="margin: 0;">-<span id="LC1214" class="line" lang="haskell"> <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="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">orig_<span class="idiff left right">n</span></span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">orig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr_orig_expr</span> <span class="p">)</span></span>
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1244
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<pre style="margin: 0;">+<span id="LC1244" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WARN</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">orig_<span class="idiff left right">oss</span></span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">orig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr_orig_expr</span> <span class="p">)</span></span>
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1215
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1245
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<pre style="margin: 0;"> <span id="LC1245" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">getTCvInScope</span> <span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span></span>
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1246
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<pre style="margin: 0;"> <span id="LC1246" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This *can* legitimately happen:</span></span>
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1247
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<pre style="margin: 0;"> <span id="LC1247" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. coerce Int (\x. x) Essentially the programmer is</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5585c72bd9ca1419e49c524ab6a6d08726626a7d...5c576e73381f677a6f3a0fd13aca6d61360ac880#f168a93cde5e2aec2441d6331dfe500172df4af3"><strong>compiler/GHC/Core/Opt/Simplify.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">@@ -46,7 +46,8 @@ import GHC.Core.Ppr ( pprCoreExpr )</td>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">hasKey</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Unfold</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Utils</span></span>
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<pre style="margin: 0;">-<span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Opt.Arity</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpand</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Opt.Arity</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</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;">arityTypeArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isBotArityType</span></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">idArityType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandAT</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.SimpleOpt</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoTyArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoValArg</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">joinPointBinding_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">joinPointBindings_maybe</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FVs</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">mkRuleInfo</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">@@ -706,10 +707,10 @@ makeTrivialBinding mode top_lvl occ_fs info expr expr_ty</td>
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706
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707
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC708" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now something very like completeBind,</span></span>
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709
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<pre style="margin: 0;"> <span id="LC709" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but without the postInlineUnconditionally part</span></span>
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<pre style="margin: 0;">-<span id="LC709" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">arity</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">is_bot</span></span><span class="p">,</span> <span class="n" style="color: #333;">expr2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tryEtaExpandRhs</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">expr1</span></span>
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710
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<pre style="margin: 0;">+<span id="LC710" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">arity<span class="idiff left right">_type</span></span><span class="p">,</span> <span class="n" style="color: #333;">expr2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tryEtaExpandRhs</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">expr1</span></span>
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711
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<pre style="margin: 0;"> <span id="LC711" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unf</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkLetUnfolding</span> <span class="p">(</span><span class="n" style="color: #333;">sm_dflags</span> <span class="n" style="color: #333;">mode</span><span class="p">)</span> <span class="n" style="color: #333;">top_lvl</span> <span class="kt" style="color: #458; font-weight: 600;">InlineRhs</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">expr2</span></span>
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712
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<pre style="margin: 0;"> <span id="LC712" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC712" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addLetBndrInfo</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">arity</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">is_bot</span></span> <span class="n" style="color: #333;">unf</span></span>
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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addLetBndrInfo</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">arity<span class="idiff left right">_type</span></span> <span class="n" style="color: #333;">unf</span></span>
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="haskell"> <span class="n" style="color: #333;">bind</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">final_id</span> <span class="n" style="color: #333;">expr2</span></span>
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<pre style="margin: 0;"> <span id="LC715" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC716" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">floats</span> <span class="p">`</span><span class="n" style="color: #333;">addLetFlts</span><span class="p">`</span> <span class="n" style="color: #333;">unitLetFloat</span> <span class="n" style="color: #333;">bind</span><span class="p">,</span> <span class="n" style="color: #333;">final_id</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">@@ -799,14 +800,13 @@ completeBind env top_lvl mb_cont old_bndr new_bndr new_rhs</td>
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799
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800
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<pre style="margin: 0;"> <span id="LC800" class="line" lang="haskell"></span>
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801
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<pre style="margin: 0;"> <span id="LC801" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do eta-expansion on the RHS of the binding</span></span>
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802
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<pre style="margin: 0;"> <span id="LC802" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Eta-expanding at let bindings] in GHC.Core.Opt.Simplify.Utils</span></span>
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<pre style="margin: 0;">-<span id="LC802" class="line" lang="haskell"> <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;">final_rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tryEtaExpandRhs</span> <span class="p">(</span><span class="n" style="color: #333;">getMode</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC803" class="line" lang="haskell"> <span class="n" style="color: #333;">new_bndr</span> <span class="n" style="color: #333;">new_rhs</span></span>
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell"> <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;">final_rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tryEtaExpandRhs</span> <span class="p">(</span><span class="n" style="color: #333;">getMode</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">new_bndr</span> <span class="n" style="color: #333;">new_rhs</span></span>
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<pre style="margin: 0;"> <span id="LC804" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC805" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Simplify the unfolding</span></span>
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<pre style="margin: 0;"> <span id="LC806" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_unfolding</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplLetUnfolding</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">mb_cont</span> <span class="n" style="color: #333;">old_bndr</span></span>
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<pre style="margin: 0;"> <span id="LC807" class="line" lang="haskell"> <span class="n" style="color: #333;">final_rhs</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">new_bndr</span><span class="p">)</span> <span class="n" style="color: #333;">new_arity</span> <span class="n" style="color: #333;">old_unf</span></span>
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC809" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addLetBndrInfo</span> <span class="n" style="color: #333;">new_bndr</span> <span class="n" style="color: #333;">new_arity</span> <span class="n" style="color: #333;"><span class="idiff left">is_bot</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">new_unfolding</span></span>
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<pre style="margin: 0;">+<span id="LC809" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addLetBndrInfo</span> <span class="n" style="color: #333;">new_bndr</span> <span class="n" style="color: #333;">new_arity</span> <span class="n" style="color: #333;">new_unfolding</span></span>
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<pre style="margin: 0;"> <span id="LC810" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [In-scope set as a substitution]</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="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">postInlineUnconditionally</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">final_bndr</span> <span class="n" style="color: #333;">occ_info</span> <span class="n" style="color: #333;">final_rhs</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">@@ -823,10 +823,13 @@ completeBind env top_lvl mb_cont old_bndr new_bndr new_rhs</td>
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<pre style="margin: 0;"> <span id="LC823" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "Binding" (ppr final_bndr <+> ppr new_unfolding) $</span></span>
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<pre style="margin: 0;"> <span id="LC824" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkFloatBind</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">final_bndr</span> <span class="n" style="color: #333;">final_rhs</span><span class="p">))</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC825" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC826" class="line" lang="haskell"><span class="n" style="color: #333;">addLetBndrInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OutId</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Bool</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutId</span></span>
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<pre style="margin: 0;">-<span id="LC827" class="line" lang="haskell"><span class="n" style="color: #333;">addLetBndrInfo</span> <span class="n" style="color: #333;">new_bndr</span> <span class="n" style="color: #333;">new_arity</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">is_bot</span></span> <span class="n" style="color: #333;">new_unf</span></span>
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<pre style="margin: 0;">+<span id="LC826" class="line" lang="haskell"><span class="n" style="color: #333;">addLetBndrInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OutId</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity<span class="idiff left right">Type</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutId</span></span>
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<pre style="margin: 0;">+<span id="LC827" class="line" lang="haskell"><span class="n" style="color: #333;">addLetBndrInfo</span> <span class="n" style="color: #333;">new_bndr</span> <span class="n" style="color: #333;">new_arity<span class="idiff left right">_type</span></span> <span class="n" style="color: #333;">new_unf</span></span>
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828
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<pre style="margin: 0;"> <span id="LC828" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_bndr</span> <span class="p">`</span><span class="n" style="color: #333;">setIdInfo</span><span class="p">`</span> <span class="n" style="color: #333;">info5</span></span>
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829
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829
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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"> <span class="n" style="color: #333;">new_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arityTypeArity</span> <span class="n" style="color: #333;">new_arity_type</span></span>
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831
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<pre style="margin: 0;">+<span id="LC831" class="line" lang="haskell"> <span class="n" style="color: #333;">is_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isBotArityType</span> <span class="n" style="color: #333;">new_arity_type</span></span>
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832
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"></span>
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833
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"> <span class="n" style="color: #333;">info1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idInfo</span> <span class="n" style="color: #333;">new_bndr</span> <span class="p">`</span><span class="n" style="color: #333;">setArityInfo</span><span class="p">`</span> <span class="n" style="color: #333;">new_arity</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="c1" style="color: #998; font-style: italic;">-- Unfolding info: Note [Setting the new unfolding]</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">@@ -844,12 +847,13 @@ addLetBndrInfo new_bndr new_arity is_bot new_unf</td>
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847
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info2</span></span>
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848
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"></span>
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846
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849
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Bottoming bindings: see Note [Bottoming bindings]</span></span>
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<pre style="margin: 0;">-<span id="LC847" class="line" lang="haskell"> <span class="n" style="color: #333;">info4</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info3</span></span>
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848
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<pre style="margin: 0;">-<span id="LC848" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setStrictnessInfo</span><span class="p">`</span></span>
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849
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<pre style="margin: 0;">-<span id="LC849" class="line" lang="haskell"> <span class="n" style="color: #333;">mkClosedStrictSig</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">new_arity</span> <span class="n" style="color: #333;">topDmd</span><span class="p">)</span> <span class="n" style="color: #333;">botDiv</span></span>
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850
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<pre style="margin: 0;">-<span id="LC850" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setCprInfo</span><span class="p">`</span> <span class="n" style="color: #333;">mkCprSig</span> <span class="n" style="color: #333;">new_arity</span> <span class="n" style="color: #333;">botCpr</span></span>
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"> <span class="n" style="color: #333;">info4</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info3</span> <span class="p">`</span><span class="n" style="color: #333;">setStrictnessInfo</span><span class="p">`</span> <span class="n" style="color: #333;">bot_sig</span></span>
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<pre style="margin: 0;">+<span id="LC851" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setCprInfo</span><span class="p">`</span> <span class="n" style="color: #333;">bot_cpr</span></span>
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<pre style="margin: 0;"> <span id="LC852" 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;">info3</span></span>
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"> <span class="n" style="color: #333;">bot_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkClosedStrictSig</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">new_arity</span> <span class="n" style="color: #333;">topDmd</span><span class="p">)</span> <span class="n" style="color: #333;">botDiv</span></span>
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"> <span class="n" style="color: #333;">bot_cpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCprSig</span> <span class="n" style="color: #333;">new_arity</span> <span class="n" style="color: #333;">botCpr</span></span>
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856
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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"></span>
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853
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857
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Zap call arity info. We have used it by now (via</span></span>
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854
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858
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- `tryEtaExpandRhs`), and the simplifier can invalidate this</span></span>
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855
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859
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- information, leading to broken code later (e.g. #13479)</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">@@ -860,9 +864,9 @@ addLetBndrInfo new_bndr new_arity is_bot new_unf</td>
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860
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864
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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861
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865
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Generally speaking the arity of a binding should not decrease. But it *can*</span></span>
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862
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866
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">legitimately happen because of RULES. Eg</span></span>
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863
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<pre style="margin: 0;">-<span id="LC863" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = g Int</span></span>
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867
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<pre style="margin: 0;">+<span id="LC867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = g <span class="idiff left right">@</span>Int</span></span>
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864
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868
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where g has arity 2, will have arity 2. But if there's a rewrite rule</span></span>
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865
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<pre style="margin: 0;">-<span id="LC865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g Int --> h</span></span>
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869
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<pre style="margin: 0;">+<span id="LC869" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g <span class="idiff left right">@</span>Int --> h</span></span>
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866
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870
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where h has arity 1, then f's arity will decrease. Here's a real-life example,</span></span>
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867
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871
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which is in the output of Specialise:</span></span>
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868
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872
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<pre style="margin: 0;"> <span id="LC872" 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">@@ -892,7 +896,7 @@ Then we'd like to drop the dead <alts> immediately. So it's good to</td>
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892
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896
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<pre style="margin: 0;"> <span id="LC896" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">propagate the info that x's RHS is bottom to x's IdInfo as rapidly as</span></span>
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893
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897
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<pre style="margin: 0;"> <span id="LC897" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">possible.</span></span>
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894
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898
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<pre style="margin: 0;"> <span id="LC898" class="line" lang="haskell"></span>
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895
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<pre style="margin: 0;">-<span id="LC895" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We use tryEtaExpandRhs on every binding, and it turns ou that the</span></span>
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899
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<pre style="margin: 0;">+<span id="LC899" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We use tryEtaExpandRhs on every binding, and it turns ou<span class="idiff left right">t</span> that the</span></span>
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896
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900
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<pre style="margin: 0;"> <span id="LC900" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">arity computation it performs (via GHC.Core.Opt.Arity.findRhsArity) already</span></span>
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897
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901
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<pre style="margin: 0;"> <span id="LC901" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">does a simple bottoming-expression analysis. So all we need to do</span></span>
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898
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902
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<pre style="margin: 0;"> <span id="LC902" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is propagate that info to the binder's IdInfo.</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">@@ -1551,7 +1555,7 @@ simplLamBndr env bndr</td>
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1551
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1555
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<pre style="margin: 0;"> <span id="LC1555" 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;">hasCoreUnfolding</span> <span class="n" style="color: #333;">old_unf</span> <span class="c1" style="color: #998; font-style: italic;">-- Special case</span></span>
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1552
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1556
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<pre style="margin: 0;"> <span id="LC1556" 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;">env1</span><span class="p">,</span> <span class="n" style="color: #333;">bndr1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplBinder</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">bndr</span></span>
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1553
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1557
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<pre style="margin: 0;"> <span id="LC1557" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unf'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplStableUnfolding</span> <span class="n" style="color: #333;">env1</span> <span class="kt" style="color: #458; font-weight: 600;">NotTopLevel</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">bndr</span></span>
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1554
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<pre style="margin: 0;">-<span id="LC1554" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">bndr1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">bndr1</span><span class="p">)</span> <span class="n" style="color: #333;">old_unf</span></span>
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1558
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<pre style="margin: 0;">+<span id="LC1558" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">bndr1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">idArity<span class="idiff left right">Type</span></span> <span class="n" style="color: #333;">bndr1</span><span class="p">)</span> <span class="n" style="color: #333;">old_unf</span></span>
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1555
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1559
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<pre style="margin: 0;"> <span id="LC1559" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">bndr2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr1</span> <span class="p">`</span><span class="n" style="color: #333;">setIdUnfolding</span><span class="p">`</span> <span class="n" style="color: #333;">unf'</span></span>
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1556
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1560
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<pre style="margin: 0;"> <span id="LC1560" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">modifyInScope</span> <span class="n" style="color: #333;">env1</span> <span class="n" style="color: #333;">bndr2</span><span class="p">,</span> <span class="n" style="color: #333;">bndr2</span><span class="p">)</span> <span class="p">}</span></span>
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1557
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1561
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<pre style="margin: 0;"> <span id="LC1561" 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">@@ -1929,7 +1933,7 @@ completeCall env var cont</td>
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1933
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<pre style="margin: 0;"> <span id="LC1933" class="line" lang="haskell"></span>
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1930
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1934
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<pre style="margin: 0;"> <span id="LC1934" class="line" lang="haskell"> <span class="n" style="color: #333;">log_inlining</span> <span class="n" style="color: #333;">doc</span></span>
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1931
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1935
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<pre style="margin: 0;"> <span id="LC1935" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">liftIO</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">dumpAction</span> <span class="n" style="color: #333;">dflags</span></span>
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1932
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<pre style="margin: 0;">-<span id="LC1932" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mk<span class="idiff left">UserStyle</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">alwaysQualify</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">AllTheWa</span>y</span><span class="p">)</span></span>
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1936
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<pre style="margin: 0;">+<span id="LC1936" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mk<span class="idiff left">DumpStyle</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">alwaysQualif</span>y</span><span class="p">)</span></span>
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1933
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1937
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<pre style="margin: 0;"> <span id="LC1937" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">dumpOptionsFromFlag</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_D_dump_inlinings</span><span class="p">)</span></span>
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1934
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1938
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<pre style="margin: 0;"> <span id="LC1938" class="line" lang="haskell"> <span class="s" style="color: #d14;">""</span> <span class="kt" style="color: #458; font-weight: 600;">FormatText</span> <span class="n" style="color: #333;">doc</span></span>
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1935
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1939
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<pre style="margin: 0;"> <span id="LC1939" 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">@@ -3735,7 +3739,7 @@ because we don't know its usage in each RHS separately</td>
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3735
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3739
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<pre style="margin: 0;"> <span id="LC3739" class="line" lang="haskell"><span class="n" style="color: #333;">simplLetUnfolding</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SimplEnv</span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span></span>
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3736
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3740
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<pre style="margin: 0;"> <span id="LC3740" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeJoinCont</span></span>
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3737
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3741
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<pre style="margin: 0;"> <span id="LC3741" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InId</span></span>
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3738
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<pre style="margin: 0;">-<span id="LC3738" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutType</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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3742
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<pre style="margin: 0;">+<span id="LC3742" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity<span class="idiff left right">Type</span></span></span>
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3739
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3743
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<pre style="margin: 0;"> <span id="LC3743" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SimplM</span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span></span>
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3740
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3744
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<pre style="margin: 0;"> <span id="LC3744" class="line" lang="haskell"><span class="n" style="color: #333;">simplLetUnfolding</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">cont_mb</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">new_rhs</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">unf</span></span>
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3741
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3745
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<pre style="margin: 0;"> <span id="LC3745" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isStableUnfolding</span> <span class="n" style="color: #333;">unf</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3765" 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="3769" 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">@@ -3765,7 +3769,9 @@ mkLetUnfolding dflags top_lvl src id new_rhs</td>
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3765
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3769
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<pre style="margin: 0;"> <span id="LC3769" class="line" lang="haskell"><span class="n" style="color: #333;">simplStableUnfolding</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SimplEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span></span>
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3766
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3770
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<pre style="margin: 0;"> <span id="LC3770" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeJoinCont</span> <span class="c1" style="color: #998; font-style: italic;">-- Just k => a join point with continuation k</span></span>
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3767
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3771
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<pre style="margin: 0;"> <span id="LC3771" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InId</span></span>
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3768
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<pre style="margin: 0;">-<span id="LC3768" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutType</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;">Unfolding</span></span>
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3772
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<pre style="margin: 0;">+<span id="LC3772" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutType</span></span>
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3773
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<pre style="margin: 0;">+<span id="LC3773" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="c1" style="color: #998; font-style: italic;">-- Used to eta expand, but only for non-join-points</span></span>
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3774
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<pre style="margin: 0;">+<span id="LC3774" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span></span>
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3769
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3775
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<pre style="margin: 0;"> <span id="LC3775" 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="kt" style="color: #458; font-weight: 600;">Unfolding</span></span>
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3770
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3776
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<pre style="margin: 0;"> <span id="LC3776" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Setting the new unfolding]</span></span>
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3771
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3777
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<pre style="margin: 0;"> <span id="LC3777" class="line" lang="haskell"><span class="n" style="color: #333;">simplStableUnfolding</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">mb_cont</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">id_arity</span> <span class="n" style="color: #333;">unf</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3828" 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="3834" 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">@@ -3828,7 +3834,7 @@ simplStableUnfolding env top_lvl mb_cont id rhs_ty id_arity unf</td>
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3828
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3834
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<pre style="margin: 0;"> <span id="LC3834" class="line" lang="haskell"> <span class="n" style="color: #333;">eta_expand</span> <span class="n" style="color: #333;">expr</span></span>
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3829
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3835
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<pre style="margin: 0;"> <span id="LC3835" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">eta_on</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expr</span></span>
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3830
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3836
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<pre style="margin: 0;"> <span id="LC3836" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">exprIsTrivial</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expr</span></span>
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3831
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<pre style="margin: 0;">-<span id="LC3831" 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;">etaExpand</span> <span class="n" style="color: #333;">id_arity</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC3837" 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;">etaExpand<span class="idiff left right">AT</span></span> <span class="n" style="color: #333;">id_arity</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC3838" class="line" lang="haskell"> <span class="n" style="color: #333;">eta_on</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sm_eta_expand</span> <span class="p">(</span><span class="n" style="color: #333;">getMode</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC3839" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3840" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Eta-expand stable unfoldings]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5585c72bd9ca1419e49c524ab6a6d08726626a7d...5c576e73381f677a6f3a0fd13aca6d61360ac880#48fbb5cdea308650de5756521feb28ec68819b9b"><strong>compiler/GHC/Core/Opt/Simplify/Utils.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1479,9 +1479,9 @@ mkLam env bndrs body cont</td>
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1479
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<pre style="margin: 0;"> <span id="LC1479" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_eta_expand</span> <span class="p">(</span><span class="n" style="color: #333;">getMode</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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1480
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<pre style="margin: 0;"> <span id="LC1480" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">any</span> <span class="n" style="color: #333;">isRuntimeVar</span> <span class="n" style="color: #333;">bndrs</span></span>
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1481
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<pre style="margin: 0;"> <span id="LC1481" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">body_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprEtaExpandArity</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">body</span></span>
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1482
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<pre style="margin: 0;">-<span id="LC1482" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">body_arity</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>
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<pre style="margin: 0;">+<span id="LC1482" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">expandableArityType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">body_arity</span></span></span>
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<pre style="margin: 0;"> <span id="LC1483" 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;">tick</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EtaExpansion</span> <span class="p">(</span><span class="n" style="color: #333;">head</span> <span class="n" style="color: #333;">bndrs</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC1484" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLams</span> <span class="n" style="color: #333;">bndrs</span> <span class="p">(</span><span class="n" style="color: #333;">etaExpand</span> <span class="n" style="color: #333;">body_arity</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1484" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLams</span> <span class="n" style="color: #333;">bndrs</span> <span class="p">(</span><span class="n" style="color: #333;">etaExpand<span class="idiff left right">AT</span></span> <span class="n" style="color: #333;">body_arity</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1485" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceSmpl</span> <span class="s" style="color: #d14;">"eta expand"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"before"</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;">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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1486
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1486
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<pre style="margin: 0;"> <span id="LC1486" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"after"</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 class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC1487" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">res</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">@@ -1551,7 +1551,7 @@ because the latter is not well-kinded.</td>
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<pre style="margin: 0;"> <span id="LC1551" 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="LC1552" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1553" class="line" lang="haskell"><span class="n" style="color: #333;">tryEtaExpandRhs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SimplMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutId</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutExpr</span></span>
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<pre style="margin: 0;">-<span id="LC1554" 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 class="idiff left">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Bool</span></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="LC1554" 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 class="idiff left right">Type</span></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="LC1555" 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="LC1556" 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="LC1557" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (a) rhs' has manifest arity n</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">@@ -1559,40 +1559,46 @@ tryEtaExpandRhs :: SimplMode -> OutId -> OutExpr</td>
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<pre style="margin: 0;"> <span id="LC1559" 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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1560
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<pre style="margin: 0;"> <span id="LC1560" 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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1561
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<pre style="margin: 0;"> <span id="LC1561" 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="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">join_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">join_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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1562
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<pre style="margin: 0;">-<span id="LC1562" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">count</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">join_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">exprIsDeadEnd</span> <span class="n" style="color: #333;">join_body</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1562" class="line" lang="haskell"> <span class="n" style="color: #333;">oss</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">idOneShotInfo</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">join_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">id</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1563" class="line" lang="haskell"> <span class="n" style="color: #333;">arity_type</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">exprIsDeadEnd</span> <span class="n" style="color: #333;">join_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">oss</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1564" 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;">ATop</span> <span class="n" style="color: #333;">oss</span></span>
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<pre style="margin: 0;">+<span id="LC1565" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">arity_type</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="p">}</span></span>
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1566
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<pre style="margin: 0;"> <span id="LC1566" 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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1567
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<pre style="margin: 0;"> <span id="LC1567" 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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1568
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<pre style="margin: 0;"> <span id="LC1568" 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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1569
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<pre style="margin: 0;"> <span id="LC1569" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Invariants on join points] invariant 2b, in GHC.Core</span></span>
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1570
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<pre style="margin: 0;"> <span id="LC1570" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1571" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">sm_eta_expand</span> <span class="n" style="color: #333;">mode</span> <span class="c1" style="color: #998; font-style: italic;">-- Provided eta-expansion is on</span></span>
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<pre style="margin: 0;">+<span id="LC1572" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">new_arity</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">old_arity</span> <span class="c1" style="color: #998; font-style: italic;">-- And the current manifest arity isn't enough</span></span>
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<pre style="margin: 0;">+<span id="LC1573" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">want_eta</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC1574" 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;">tick</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EtaExpansion</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1575" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">arity_type</span><span class="p">,</span> <span class="n" style="color: #333;">etaExpandAT</span> <span class="n" style="color: #333;">arity_type</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1576" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1577" 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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1569
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<pre style="margin: 0;">-<span id="LC1569" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">do</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">new_arity</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">is_bot</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">new_rhs</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">try_expand</span></span></span>
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<pre style="margin: 0;">+<span id="LC1578" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">return</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">arity_type</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhs</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC1579" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1571" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">WARN</span><span class="p">(</span> <span class="n" style="color: #333;">new_arity</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">old_id_arity</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC1572" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Arity decrease:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">bndr</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">old_id_arity</span></span>
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<pre style="margin: 0;">-<span id="LC1573" 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;">old_arity</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">new_arity</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;">new_rhs</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1574" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Arity decrease] in GHC.Core.Opt.Simplify</span></span>
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<pre style="margin: 0;">-<span id="LC1575" class="line" lang="haskell"> <span class="n" style="color: #333;">return</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="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1580" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1577" class="line" lang="haskell"> <span class="n" style="color: #333;">try_expand</span></span>
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1578
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<pre style="margin: 0;">-<span id="LC1578" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">exprIsTrivial</span> <span class="n" style="color: #333;">rhs</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Do not eta-expand trivial expressions]</span></span>
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<pre style="margin: 0;">-<span id="LC1579" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">exprArity</span> <span class="n" style="color: #333;">rhs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</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="LC1580" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1581" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">sm_eta_expand</span> <span class="n" style="color: #333;">mode</span> <span class="c1" style="color: #998; font-style: italic;">-- Provided eta-expansion is on</span></span>
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<pre style="margin: 0;">-<span id="LC1582" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">new_arity</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">old_arity</span> <span class="c1" style="color: #998; font-style: italic;">-- And the current manifest arity isn't enough</span></span>
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1583
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<pre style="margin: 0;">-<span id="LC1583" 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;">tick</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EtaExpansion</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span></span>
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1584
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<pre style="margin: 0;">-<span id="LC1584" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">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;">etaExpand</span> <span class="n" style="color: #333;">new_arity</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="p">}</span></span>
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1585
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<pre style="margin: 0;">-<span id="LC1585" class="line" lang="haskell"></span>
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1586
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<pre style="margin: 0;">-<span id="LC1586" 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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1587
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<pre style="margin: 0;">-<span id="LC1587" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">old_arity</span><span class="p">,</span> <span class="n" style="color: #333;">is_bot</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">new_arity</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">old_arity</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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1588
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<pre style="margin: 0;">-<span id="LC1588" class="line" lang="haskell"></span>
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1589
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<pre style="margin: 0;">-<span id="LC1589" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sm_dflags</span> <span class="n" style="color: #333;">mode</span></span>
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1590
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<pre style="margin: 0;">-<span id="LC1590" class="line" lang="haskell"> <span class="n" style="color: #333;">old_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprArity</span> <span class="n" style="color: #333;">rhs</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Do not expand eta-expand PAPs]</span></span>
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1591
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<pre style="margin: 0;">-<span id="LC1591" class="line" lang="haskell"> <span class="n" style="color: #333;">old_id_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">bndr</span></span>
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1592
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<pre style="margin: 0;">-<span id="LC1592" class="line" lang="haskell"></span>
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1593
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<pre style="margin: 0;">-<span id="LC1593" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">new_arity1</span><span class="p">,</span> <span class="n" style="color: #333;">is_bot</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findRhsArity</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">old_arity</span></span>
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1594
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<pre style="margin: 0;">-<span id="LC1594" class="line" lang="haskell"> <span class="n" style="color: #333;">new_arity2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idCallArity</span> <span class="n" style="color: #333;">bndr</span></span>
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1595
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<pre style="margin: 0;">-<span id="LC1595" class="line" lang="haskell"> <span class="n" style="color: #333;">new_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">max</span> <span class="n" style="color: #333;">new_arity1</span> <span class="n" style="color: #333;">new_arity2</span></span>
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<pre style="margin: 0;">+<span id="LC1581" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sm_dflags</span> <span class="n" style="color: #333;">mode</span></span>
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<pre style="margin: 0;">+<span id="LC1582" class="line" lang="haskell"> <span class="n" style="color: #333;">old_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprArity</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC1583" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1584" class="line" lang="haskell"> <span class="n" style="color: #333;">arity_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findRhsArity</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">old_arity</span></span>
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<pre style="margin: 0;">+<span id="LC1585" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">maxWithArity</span><span class="p">`</span> <span class="n" style="color: #333;">idCallArity</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;">+<span id="LC1586" class="line" lang="haskell"> <span class="n" style="color: #333;">new_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arityTypeArity</span> <span class="n" style="color: #333;">arity_type</span></span>
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<pre style="margin: 0;">+<span id="LC1587" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1588" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Which RHSs do we eta-expand?]</span></span>
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1589
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<pre style="margin: 0;">+<span id="LC1589" class="line" lang="haskell"> <span class="n" style="color: #333;">want_eta</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;">want_eta</span> <span class="n" style="color: #333;">e</span></span>
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1590
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<pre style="margin: 0;">+<span id="LC1590" class="line" lang="haskell"> <span class="n" style="color: #333;">want_eta</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tick</span> <span class="kr" style="font-weight: 600;">_</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;">want_eta</span> <span class="n" style="color: #333;">e</span></span>
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1591
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<pre style="margin: 0;">+<span id="LC1591" class="line" lang="haskell"> <span class="n" style="color: #333;">want_eta</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">b</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;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">want_eta</span> <span class="n" style="color: #333;">e</span></span>
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1592
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<pre style="margin: 0;">+<span id="LC1592" class="line" lang="haskell"> <span class="n" style="color: #333;">want_eta</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;">exprIsTrivial</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">want_eta</span> <span class="n" style="color: #333;">e</span></span>
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1593
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<pre style="margin: 0;">+<span id="LC1593" class="line" lang="haskell"> <span class="n" style="color: #333;">want_eta</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="kt" style="color: #458; font-weight: 600;">False</span></span>
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1594
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<pre style="margin: 0;">+<span id="LC1594" class="line" lang="haskell"> <span class="n" style="color: #333;">want_eta</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lit</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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1595
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<pre style="margin: 0;">+<span id="LC1595" class="line" lang="haskell"> <span class="n" style="color: #333;">want_eta</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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1596
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<pre style="margin: 0;">+<span id="LC1596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1597
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<pre style="margin: 0;">+<span id="LC1597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> want_eta _ = case arity_type of</span></span>
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1598
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<pre style="margin: 0;">+<span id="LC1598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ATop (os:_) -> isOneShotInfo os</span></span>
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1599
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<pre style="margin: 0;">+<span id="LC1599" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ATop [] -> False</span></span>
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1600
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<pre style="margin: 0;">+<span id="LC1600" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ABot {} -> True</span></span>
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1601
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<pre style="margin: 0;">+<span id="LC1601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1602
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<pre style="margin: 0;"> <span id="LC1602" class="line" lang="haskell"></span>
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1603
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<pre style="margin: 0;"> <span id="LC1603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1604
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<pre style="margin: 0;"> <span id="LC1604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Eta-expanding at let bindings]</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">@@ -1619,14 +1625,53 @@ because then 'genMap' will inline, and it really shouldn't: at least</td>
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1619
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1625
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<pre style="margin: 0;"> <span id="LC1625" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">as far as the programmer is concerned, it's not applied to two</span></span>
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1620
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1626
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<pre style="margin: 0;"> <span id="LC1626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">arguments!</span></span>
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1621
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1627
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<pre style="margin: 0;"> <span id="LC1627" class="line" lang="haskell"></span>
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1622
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<pre style="margin: 0;">-<span id="LC1622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Do not eta-expand trivial expressions]</span></span>
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1623
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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 class="cm" style="color: #998; font-style: italic;">Do not eta-expand a trivial RHS like</span></span>
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<pre style="margin: 0;">-<span id="LC1625" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = g</span></span>
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1626
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<pre style="margin: 0;">-<span id="LC1626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we eta expand do</span></span>
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1627
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<pre style="margin: 0;">-<span id="LC1627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = \x. g x</span></span>
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1628
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<pre style="margin: 0;">-<span id="LC1628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we'll just eta-reduce again, and so on; so the</span></span>
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1629
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<pre style="margin: 0;">-<span id="LC1629" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">simplifier never terminates.</span></span>
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1628
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<pre style="margin: 0;">+<span id="LC1628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Which RHSs do we eta-expand?]</span></span>
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1629
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<pre style="margin: 0;">+<span id="LC1629" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1630
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<pre style="margin: 0;">+<span id="LC1630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We don't eta-expand:</span></span>
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1631
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<pre style="margin: 0;">+<span id="LC1631" class="line" lang="haskell"></span>
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1632
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<pre style="margin: 0;">+<span id="LC1632" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Trivial RHSs, e.g. f = g</span></span>
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1633
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<pre style="margin: 0;">+<span id="LC1633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we eta expand do</span></span>
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<pre style="margin: 0;">+<span id="LC1634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = \x. g x</span></span>
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<pre style="margin: 0;">+<span id="LC1635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we'll just eta-reduce again, and so on; so the</span></span>
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1636
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<pre style="margin: 0;">+<span id="LC1636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> simplifier never terminates.</span></span>
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1637
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<pre style="margin: 0;">+<span id="LC1637" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* PAPs: see Note [Do not eta-expand PAPs]</span></span>
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1639
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<pre style="margin: 0;">+<span id="LC1639" class="line" lang="haskell"></span>
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1640
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<pre style="margin: 0;">+<span id="LC1640" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">What about things like this?</span></span>
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1641
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<pre style="margin: 0;">+<span id="LC1641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = case y of p -> \x -> blah</span></span>
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1642
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<pre style="margin: 0;">+<span id="LC1642" class="line" lang="haskell"></span>
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1643
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<pre style="margin: 0;">+<span id="LC1643" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here we do eta-expand. This is a change (Jun 20), but if we have</span></span>
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1644
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<pre style="margin: 0;">+<span id="LC1644" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">really decided that f has arity 1, then putting that lambda at the top</span></span>
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1645
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<pre style="margin: 0;">+<span id="LC1645" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">seems like a Good idea.</span></span>
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1646
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<pre style="margin: 0;">+<span id="LC1646" class="line" lang="haskell"></span>
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1647
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<pre style="margin: 0;">+<span id="LC1647" 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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1648
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<pre style="margin: 0;">+<span id="LC1648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1649
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<pre style="margin: 0;">+<span id="LC1649" 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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1650
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<pre style="margin: 0;">+<span id="LC1650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">would eta-expand even PAPs. But this gives no particular advantage,</span></span>
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1651
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<pre style="margin: 0;">+<span id="LC1651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and can lead to a massive blow-up in code size, exhibited by #9020.</span></span>
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1652
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<pre style="margin: 0;">+<span id="LC1652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose we have a PAP</span></span>
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1653
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<pre style="margin: 0;">+<span id="LC1653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo :: IO ()</span></span>
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1654
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<pre style="margin: 0;">+<span id="LC1654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo = returnIO ()</span></span>
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1655
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<pre style="margin: 0;">+<span id="LC1655" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then we can eta-expand do</span></span>
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1656
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<pre style="margin: 0;">+<span id="LC1656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo = (\eta. (returnIO () |> sym g) eta) |> g</span></span>
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1657
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<pre style="margin: 0;">+<span id="LC1657" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where</span></span>
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1658
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<pre style="margin: 0;">+<span id="LC1658" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g :: IO () ~ State# RealWorld -> (# State# RealWorld, () #)</span></span>
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1659
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<pre style="margin: 0;">+<span id="LC1659" class="line" lang="haskell"></span>
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1660
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<pre style="margin: 0;">+<span id="LC1660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But there is really no point in doing this, and it generates masses of</span></span>
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1661
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<pre style="margin: 0;">+<span id="LC1661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">coercions and whatnot that eventually disappear again. For T9020, GHC</span></span>
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1662
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<pre style="margin: 0;">+<span id="LC1662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">allocated 6.6G before, and 0.8G afterwards; and residency dropped from</span></span>
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1663
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<pre style="margin: 0;">+<span id="LC1663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1.8G to 45M.</span></span>
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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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1665
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<pre style="margin: 0;">+<span id="LC1665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Moreover, if we eta expand</span></span>
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1666
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<pre style="margin: 0;">+<span id="LC1666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = g d ==> f = \x. g d x</span></span>
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1667
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<pre style="margin: 0;">+<span id="LC1667" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that might in turn make g inline (if it has an inline pragma), which</span></span>
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1668
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<pre style="margin: 0;">+<span id="LC1668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we might not want. After all, INLINE pragmas say "inline only when</span></span>
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1669
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<pre style="margin: 0;">+<span id="LC1669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">saturated" so we don't want to be too gung-ho about saturating!</span></span>
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<pre style="margin: 0;">+<span id="LC1670" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1671" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But note that this won't eta-expand, say</span></span>
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<pre style="margin: 0;">+<span id="LC1672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = \g -> map g</span></span>
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<pre style="margin: 0;">+<span id="LC1673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Does it matter not eta-expanding such functions? I'm not sure. Perhaps</span></span>
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<pre style="margin: 0;">+<span id="LC1674" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">strictness analysis will have less to bite on?</span></span>
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1675
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<pre style="margin: 0;"> <span id="LC1675" class="line" lang="haskell"></span>
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1631
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1676
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<pre style="margin: 0;"> <span id="LC1676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Do not eta-expand join points]</span></span>
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1632
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1677
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<pre style="margin: 0;"> <span id="LC1677" 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">@@ -1667,29 +1712,6 @@ CorePrep comes around, the code is very likely to look more like this:</td>
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1667
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1712
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<pre style="margin: 0;"> <span id="LC1712" 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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1668
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1713
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<pre style="margin: 0;"> <span id="LC1713" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> else (...) eta</span></span>
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1669
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1714
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<pre style="margin: 0;"> <span id="LC1714" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1670" 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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1671
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<pre style="margin: 0;">-<span id="LC1671" 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="LC1672" 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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1673
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<pre style="margin: 0;">-<span id="LC1673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">would eta-expand even PAPs. But this gives no particular advantage,</span></span>
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<pre style="margin: 0;">-<span id="LC1674" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and can lead to a massive blow-up in code size, exhibited by #9020.</span></span>
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<pre style="margin: 0;">-<span id="LC1675" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose we have a PAP</span></span>
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1676
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<pre style="margin: 0;">-<span id="LC1676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo :: IO ()</span></span>
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1677
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<pre style="margin: 0;">-<span id="LC1677" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo = returnIO ()</span></span>
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1678
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<pre style="margin: 0;">-<span id="LC1678" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then we can eta-expand do</span></span>
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1679
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<pre style="margin: 0;">-<span id="LC1679" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo = (\eta. (returnIO () |> sym g) eta) |> g</span></span>
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1680
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<pre style="margin: 0;">-<span id="LC1680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where</span></span>
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1681
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<pre style="margin: 0;">-<span id="LC1681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g :: IO () ~ State# RealWorld -> (# State# RealWorld, () #)</span></span>
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1682
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<pre style="margin: 0;">-<span id="LC1682" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But there is really no point in doing this, and it generates masses of</span></span>
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1684
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<pre style="margin: 0;">-<span id="LC1684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">coercions and whatnot that eventually disappear again. For T9020, GHC</span></span>
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1685
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<pre style="margin: 0;">-<span id="LC1685" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">allocated 6.6G before, and 0.8G afterwards; and residency dropped from</span></span>
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1686
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<pre style="margin: 0;">-<span id="LC1686" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1.8G to 45M.</span></span>
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1687
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<pre style="margin: 0;">-<span id="LC1687" class="line" lang="haskell"></span>
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1688
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<pre style="margin: 0;">-<span id="LC1688" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But note that this won't eta-expand, say</span></span>
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1689
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<pre style="margin: 0;">-<span id="LC1689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = \g -> map g</span></span>
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1690
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<pre style="margin: 0;">-<span id="LC1690" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Does it matter not eta-expanding such functions? I'm not sure. Perhaps</span></span>
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<pre style="margin: 0;">-<span id="LC1691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">strictness analysis will have less to bite on?</span></span>
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1692
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<pre style="margin: 0;">-<span id="LC1692" class="line" lang="haskell"></span>
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1715
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<pre style="margin: 0;"> <span id="LC1715" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1716" 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="LC1717" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5585c72bd9ca1419e49c524ab6a6d08726626a7d...5c576e73381f677a6f3a0fd13aca6d61360ac880#81707f1fe21087531cefd70879aa09c2be5c1d22"><strong>compiler/GHC/Tc/Solver/Flatten.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">@@ -954,8 +954,11 @@ faster. This doesn't seem quite worth it, yet.</td>
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<pre style="margin: 0;"> <span id="LC954" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC955" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [flatten_exact_fam_app_fully performance]</span></span>
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<pre style="margin: 0;"> <span id="LC956" 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="LC957" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC958" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The refactor of GRefl seems to cause performance trouble for T9872x: the allocation of flatten_exact_fam_app_fully_performance increased. See note [Generalized reflexive coercion] in GHC.Core.TyCo.Rep for more information about GRefl and #15192 for the current state.</span></span>
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<pre style="margin: 0;">+<span id="LC957" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The refactor of GRefl seems to cause performance trouble for T9872x:</span></span>
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<pre style="margin: 0;">+<span id="LC958" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the allocation of flatten_exact_fam_app_fully_performance</span></span>
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<pre style="margin: 0;">+<span id="LC959" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">increased. See note [Generalized reflexive coercion] in</span></span>
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Core.TyCo.Rep for more information about GRefl and #15192 for the</span></span>
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">current state.</span></span>
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<pre style="margin: 0;"> <span id="LC962" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC963" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The explicit pattern match in homogenise_result helps with T9872a, b, c.</span></span>
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<pre style="margin: 0;"> <span id="LC964" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5585c72bd9ca1419e49c524ab6a6d08726626a7d...5c576e73381f677a6f3a0fd13aca6d61360ac880#3546a27dca8d24e385baf522ae17a6279b777b07"><strong>testsuite/tests/simplCore/should_compile/T18355.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18355</span> <span class="kr" style="font-weight: 600;">where</span></span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- I expect the simplified Core to have an eta-expaned</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- defn of f, with a OneShot on the final lambda-binder</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">oneShot</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">+</span><span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">-</span><span class="n" style="color: #333;">y</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5585c72bd9ca1419e49c524ab6a6d08726626a7d...5c576e73381f677a6f3a0fd13aca6d61360ac880#567031a571455045b61cacbcb7f3806ae34cd4f6"><strong>testsuite/tests/simplCore/should_compile/T18355.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">==================== Tidy Core ====================</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">Result size of Tidy Core</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> = {terms: 32, types: 23, coercions: 0, joins: 0/0}</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">-- RHS size: {terms: 17, types: 10, coercions: 0, joins: 0/0}</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">f :: forall {a}. Num a => a -> Bool -> a -> a</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">[GblId,</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> Arity=4,</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> Str=<S,1*U(1*C1(C1(U)),1*C1(C1(U)),A,A,A,A,A)><L,U><S,1*U><L,U>,</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> Unf=Unf{Src=InlineStable, TopLvl=True, Value=True, ConLike=True,</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> WorkFree=True, Expandable=True,</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> Guidance=ALWAYS_IF(arity=4,unsat_ok=True,boring_ok=False)</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> Tmpl= \ (@a)</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> ($dNum [Occ=Once*] :: Num a)</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> (x [Occ=Once*] :: a)</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> (b [Occ=Once!] :: Bool)</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> (eta [Occ=Once*, OS=OneShot] :: a) -></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> case b of {</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> False -> - @a $dNum x eta;</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"> True -> + @a $dNum x eta</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"> }}]</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext">f = \ (@a)</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> ($dNum :: Num a)</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext"> (x :: a)</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext"> (b :: Bool)</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"> (eta [OS=OneShot] :: a) -></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> case b of {</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext"> False -> - @a $dNum x eta;</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"> True -> + @a $dNum x eta</span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext"> }</span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext">-- RHS size: {terms: 1, types: 0, coercions: 0, joins: 0/0}</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext">T18355.$trModule4 :: Addr#</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext">[GblId,</span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext"> Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,</span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="plaintext"> WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 20 0}]</span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="plaintext">T18355.$trModule4 = "main"#</span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext">-- RHS size: {terms: 2, types: 0, coercions: 0, joins: 0/0}</span>
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41
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext">T18355.$trModule3 :: GHC.Types.TrName</span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="plaintext">[GblId,</span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext"> Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,</span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="plaintext"> WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 10 20}]</span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="plaintext">T18355.$trModule3 = GHC.Types.TrNameS T18355.$trModule4</span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="plaintext">-- RHS size: {terms: 1, types: 0, coercions: 0, joins: 0/0}</span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext">T18355.$trModule2 :: Addr#</span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="plaintext">[GblId,</span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="plaintext"> Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,</span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext"> WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 30 0}]</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext">T18355.$trModule2 = "T18355"#</span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="plaintext">-- RHS size: {terms: 2, types: 0, coercions: 0, joins: 0/0}</span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext">T18355.$trModule1 :: GHC.Types.TrName</span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext">[GblId,</span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="plaintext"> Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,</span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="plaintext"> WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 10 20}]</span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext">T18355.$trModule1 = GHC.Types.TrNameS T18355.$trModule2</span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="plaintext">-- RHS size: {terms: 3, types: 0, coercions: 0, joins: 0/0}</span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="plaintext">T18355.$trModule :: GHC.Types.Module</span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="plaintext">[GblId,</span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="plaintext"> Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,</span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="plaintext"> WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 10 30}]</span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="plaintext">T18355.$trModule</span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="plaintext"> = GHC.Types.Module T18355.$trModule3 T18355.$trModule1</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5585c72bd9ca1419e49c524ab6a6d08726626a7d...5c576e73381f677a6f3a0fd13aca6d61360ac880#fc07c260b75644727a8cdc1af5c861a44d4bfb5e"><strong>testsuite/tests/simplCore/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -330,4 +330,5 @@ test('T17673', [ only_ways(['optasm']), grep_errmsg(r'^\w+\.\$wf') ], compile, [</td>
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<pre style="margin: 0;"> <span id="LC330" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18078</span><span class="p">',</span> <span class="p">[</span> <span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">optasm</span><span class="p">']),</span> <span class="nv" style="color: #008080;">grep_errmsg</span><span class="p">(</span><span class="nv" style="color: #008080;">r</span><span class="p">'</span><span class="s1" style="color: #d14;">^</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">\</span><span class="s1" style="color: #d14;">w+</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">\</span><span class="s1" style="color: #d14;">.</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">\</span><span class="s1" style="color: #d14;">$wf</span><span class="p">')</span> <span class="p">],</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-ddump-simpl -dsuppress-uniques -dppr-cols=9999</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC331" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18328</span><span class="p">',</span> <span class="p">[</span> <span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">optasm</span><span class="p">']),</span> <span class="nv" style="color: #008080;">grep_errmsg</span><span class="p">(</span><span class="nv" style="color: #008080;">r</span><span class="p">'</span><span class="s1" style="color: #d14;">Arity=</span><span class="p">')</span> <span class="p">],</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-ddump-simpl -dsuppress-uniques</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC332" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18347</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="s1" style="color: #d14;">-dcore-lint -O</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18355</span><span class="p">',</span> <span class="p">[</span> <span class="nv" style="color: #008080;">grep_errmsg</span><span class="p">(</span><span class="nv" style="color: #008080;">r</span><span class="p">'</span><span class="s1" style="color: #d14;">OneShot</span><span class="p">')</span> <span class="p">],</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O -ddump-simpl -dsuppress-uniques</span><span class="p">'])</span></span>
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333
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18399</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="s1" style="color: #d14;">-dcore-lint -O</span><span class="p">'])</span></span></pre>
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