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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/0db5559183cb115761f017537ff6cff9f32fa155">0db55591</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-26T23:29:26+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Define multiShotIO and use it in mkSplitUniqueSupply
This patch is part of the ongoing eta-expansion saga;
see #18238.
It implements a neat trick (suggested by Sebastian Graf)
that allows the programmer to disable the default one-shot behaviour
of IO (the "state hack"). The trick is to use a new multiShotIO
function; see Note [multiShotIO]. For now, multiShotIO is defined
here in Unique.Supply; but it should ultimately be moved to the IO
library.
The change is necessary to get good code for GHC's unique supply;
see Note [Optimising the unique supply].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/349b171d4b665a9b9cb421c78dc1bbdc217a7ad2">349b171d</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-26T23:29:26+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make arityType deal with join points
As Note [Eta-expansion and join points] describes,
this patch makes arityType deal correctly with join points.
What was there before was not wrong, but yielded lower
arities than it could.
Fixes #18328
In base GHC this makes no difference to nofib.
Program Size Allocs Runtime Elapsed TotalMem
--------------------------------------------------------------------------------
n-body -0.1% -0.1% -1.2% -1.1% 0.0%
--------------------------------------------------------------------------------
Min -0.1% -0.1% -55.0% -56.5% 0.0%
Max -0.0% 0.0% +16.1% +13.4% 0.0%
Geometric Mean -0.0% -0.0% -30.1% -31.0% -0.0%
But it starts to make real difference when we land the change to the
way mkDupableAlts handles StrictArg, in fixing #13253 and friends.
I think this is because we then get more non-inlined join points.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4884991b595a2c0038284963c503250cdf9b8f4d">4884991b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-26T23:29:26+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.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97094de0578127b0fc2250c33b4e3276b52ceae2">97094de0</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-26T23:29:26+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/818cb9a0967fe7ffbce287a32afaa48bdc3cc8c0">818cb9a0</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-26T23:29:26+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments only
</pre>
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<h4>11 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="#aa79261abf782f3dc603af7fbd5c4b08ed3ddb88">
compiler/GHC/Core/Opt/ConstantFold.hs
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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="#598aebb67cf4996e7c7414ec0bef247e3b5e0d73">
compiler/GHC/Types/Unique/Supply.hs
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<li class="file-stats">
<a href="#c08d10d15b9eec0bfe065f755c16bf30c0f812f2">
<span class="new-file">
+
testsuite/tests/simplCore/should_compile/T18328.hs
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<li class="file-stats">
<a href="#0cdebe5bde9afbd0b1a242c68e3fd1eece347d36">
<span class="new-file">
+
testsuite/tests/simplCore/should_compile/T18328.stderr
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</a>
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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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</li>
</ul>
<h4>Changes:</h4>
<li id="c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f56cffffb7bc75c771f82ad231585aa894b42e7a...818cb9a0967fe7ffbce287a32afaa48bdc3cc8c0#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999"><strong>compiler/GHC/Core/Opt/Arity.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_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="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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<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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<td class="diff-line-num old_line" data-linenumber="18" 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="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="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -36,12 +39,13 @@ import GHC.Core.TyCon ( initRecTc, checkRecTc )</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Predicate</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">isDictTy</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Coercion</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Multiplicity</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique</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.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="LC44" 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">@@ -156,7 +160,9 @@ exprBotStrictness_maybe e</td>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ar</span> <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;">ar</span><span class="p">,</span> <span class="n" style="color: #333;">sig</span> <span class="n" style="color: #333;">ar</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC159" 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_ped_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</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="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC163" 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_ped_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ae_cheap_fn</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC165" 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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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"> <span class="n" style="color: #333;">sig</span> <span class="n" style="color: #333;">ar</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;">ar</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="LC167" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC168" 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">@@ -483,8 +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="LC486" 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="LC487" 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">@@ -492,21 +501,49 @@ 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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525
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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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526
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<pre style="margin: 0;">+<span id="LC526" class="line" lang="haskell"></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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<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="LC500" 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="LC504" 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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505
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<pre style="margin: 0;">-<span id="LC505" 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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506
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<pre style="margin: 0;">-<span id="LC506" 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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<pre style="margin: 0;">-<span id="LC509" 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 class="p">}</span></span>
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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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<pre style="margin: 0;">+<span id="LC546" 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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<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;">getBotArity</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;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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<pre style="margin: 0;"> <span id="LC549" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Arity of a divergent function</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">@@ -525,7 +562,7 @@ mk_cheap_fn dflags cheap_app</td>
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562
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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="LC528" 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">@@ -539,46 +576,37 @@ 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="LC542" 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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543
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<pre style="margin: 0;">-<span id="LC543" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC544" 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="LC545" 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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546
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<pre style="margin: 0;">-<span id="LC546" 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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547
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<pre style="margin: 0;">-<span id="LC547" 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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549
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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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550
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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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551
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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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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="LC553" 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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<pre style="margin: 0;">-<span id="LC554" 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="LC555" 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="LC556" 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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557
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<pre style="margin: 0;">-<span id="LC557" 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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<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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558
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589
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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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559
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590
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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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560
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<pre style="margin: 0;">-<span id="LC560" 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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561
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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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562
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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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563
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<pre style="margin: 0;">-<span id="LC563" 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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564
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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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565
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<pre style="margin: 0;">-<span id="LC565" 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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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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567
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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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568
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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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569
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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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570
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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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571
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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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<pre style="margin: 0;">-<span id="LC572" 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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573
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<pre style="margin: 0;">-<span id="LC573" 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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574
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<pre style="margin: 0;">-<span id="LC574" 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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<pre style="margin: 0;">-<span id="LC575" 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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<pre style="margin: 0;">-<span id="LC576" 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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577
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<pre style="margin: 0;">-<span id="LC577" 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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578
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<pre style="margin: 0;">-<span id="LC578" 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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579
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<pre style="margin: 0;">-<span id="LC579" 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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<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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580
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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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<pre style="margin: 0;">-<span id="LC581" 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 class="p">}</span></span>
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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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<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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610
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<pre style="margin: 0;"> <span id="LC610" class="line" lang="haskell"></span>
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611
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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612
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<pre style="margin: 0;"> <span id="LC612" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Arity analysis]</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">@@ -608,7 +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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609
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637
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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="LC611" class="line" lang="haskell"></span>
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639
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Eta expanding through dictionaries]</span></span>
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613
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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">@@ -627,24 +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="LC630" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC631" 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="LC632" 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="LC633" 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="LC634" 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="LC635" 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="LC636" 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="LC637" class="line" lang="haskell"></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;">When we see</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;"> f = case y of p -> \x -> blah</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;">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="LC641" 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="LC642" 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="LC643" 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="LC644" 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="LC645" 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="LC646" 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="LC647" 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">@@ -668,6 +677,7 @@ arityApp (ATop []) _ = ATop []</td>
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677
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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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678
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<pre style="margin: 0;"> <span id="LC678" class="line" lang="haskell"></span>
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679
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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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681
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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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682
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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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683
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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">@@ -736,14 +746,20 @@ type CheapFun = CoreExpr -> Maybe Type -> Bool</td>
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736
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746
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<pre style="margin: 0;"> <span id="LC746" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ArityEnv</span></span>
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737
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747
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<pre style="margin: 0;"> <span id="LC747" class="line" lang="haskell"> <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="kt" style="color: #458; font-weight: 600;">CheapFun</span></span>
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<pre style="margin: 0;"> <span id="LC748" 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="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True <=> be pedantic about bottoms</span></span>
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<pre style="margin: 0;">+<span id="LC749" 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="kt" style="color: #458; font-weight: 600;">IdSet</span> <span class="c1" style="color: #998; font-style: italic;">-- In-scope join points</span></span>
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<pre style="margin: 0;">+<span id="LC750" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Eta-expansion and join points]</span></span>
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739
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751
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<pre style="margin: 0;"> <span id="LC751" class="line" lang="haskell"> <span class="p">}</span></span>
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752
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<pre style="margin: 0;"> <span id="LC752" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC753" class="line" lang="haskell"><span class="n" style="color: #333;">extendJoinEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">JoinId</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityEnv</span></span>
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<pre style="margin: 0;">+<span id="LC754" class="line" lang="haskell"><span class="n" style="color: #333;">extendJoinEnv</span> <span class="n" style="color: #333;">env</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AE</span> <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;">joins</span> <span class="p">})</span> <span class="n" style="color: #333;">join_ids</span></span>
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<pre style="margin: 0;">+<span id="LC755" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">{</span> <span class="n" style="color: #333;">ae_joins</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">joins</span> <span class="p">`</span><span class="n" style="color: #333;">extendVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">join_ids</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC756" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC757" 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="LC758" class="line" lang="haskell"><span class="n" style="color: #333;">arityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityEnv</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;">ArityType</span></span>
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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="LC745" 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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<pre style="margin: 0;">-<span id="LC746" 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">@@ -755,18 +771,11 @@ arityType env (Cast e co)</td>
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<pre style="margin: 0;"> <span id="LC771" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- However, do make sure that ATop -> ATop and ABot -> ABot!</span></span>
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<pre style="margin: 0;"> <span id="LC772" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Casts don't affect that part. Getting this wrong provoked #5475</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="LC758" class="line" lang="haskell"><span class="n" style="color: #333;">arityType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC759" 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="LC760" 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="LC761" 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="LC762" 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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<pre style="margin: 0;">-<span id="LC763" 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="LC764" 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="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="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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766
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<pre style="margin: 0;">-<span id="LC766" 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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767
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<pre style="margin: 0;">-<span id="LC767" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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768
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<pre style="margin: 0;">-<span id="LC768" 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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769
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<pre style="margin: 0;">-<span id="LC769" 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">@@ -789,13 +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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<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="LC792" 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="LC793" 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="LC796" 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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<pre style="margin: 0;">-<span id="LC797" 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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798
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<pre style="margin: 0;">-<span id="LC798" 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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805
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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">@@ -804,6 +813,28 @@ arityType env (Case scrut _ _ alts)</td>
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<pre style="margin: 0;"> <span id="LC813" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="haskell"> <span class="n" style="color: #333;">alts_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr1</span> <span class="n" style="color: #333;">andArityType</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="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">alts</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC815" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC816" 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;">Let</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">j</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC817" 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;">j</span></span>
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<pre style="margin: 0;">+<span id="LC818" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_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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<pre style="margin: 0;">+<span id="LC819" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</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="LC820" class="line" lang="haskell"> <span class="n" style="color: #333;">andArityType</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_body</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC821" class="line" lang="haskell"> <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;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC822" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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823
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<pre style="margin: 0;">+<span id="LC823" class="line" lang="haskell"> <span class="n" style="color: #333;">env'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendJoinEnv</span> <span class="n" style="color: #333;">env</span> <span class="p">[</span><span class="n" style="color: #333;">j</span><span class="p">]</span></span>
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824
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<pre style="margin: 0;">+<span id="LC824" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC825" 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;">Let</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="n" style="color: #333;">pairs</span><span class="p">)</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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826
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<pre style="margin: 0;">+<span id="LC826" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">((</span><span class="n" style="color: #333;">j</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pairs</span></span>
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<pre style="margin: 0;">+<span id="LC827" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">j</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="c1" style="color: #998; font-style: italic;">-- See Note [Eta-expansion and join points]</span></span>
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829
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">andArityType</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">do_one</span><span class="p">)</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;">body</span><span class="p">)</span> <span class="n" style="color: #333;">pairs</span></span>
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC831" class="line" lang="haskell"> <span class="n" style="color: #333;">env'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendJoinEnv</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">pairs</span><span class="p">)</span></span>
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832
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one</span> <span class="p">(</span><span class="n" style="color: #333;">j</span><span class="p">,</span><span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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833
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<pre style="margin: 0;">+<span id="LC833" 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;">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;">j</span></span>
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834
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<pre style="margin: 0;">+<span id="LC834" 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="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">snd</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">collectNBinders</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">rhs</span></span>
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835
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<pre style="margin: 0;">+<span id="LC835" 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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836
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"arityType:joinrec"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pairs</span><span class="p">)</span></span>
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837
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"></span>
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807
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<pre style="margin: 0;"> <span id="LC838" 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;">Let</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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808
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839
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">floatIn</span> <span class="p">(</span><span class="n" style="color: #333;">cheap_bind</span> <span class="n" style="color: #333;">b</span><span class="p">)</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>
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840
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<pre style="margin: 0;"> <span id="LC840" 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">@@ -816,6 +847,73 @@ arityType env (Tick t e)</td>
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847
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"></span>
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848
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"><span class="n" style="color: #333;">arityType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vanillaArityType</span></span>
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818
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849
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell"></span>
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850
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Eta-expansion and join points]</span></span>
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851
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<pre style="margin: 0;">+<span id="LC851" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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852
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<pre style="margin: 0;">+<span id="LC852" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider this (#18328)</span></span>
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853
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<pre style="margin: 0;">+<span id="LC853" class="line" lang="haskell"></span>
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854
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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x = join j y = case y of</span></span>
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855
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> True -> \a. blah</span></span>
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856
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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> False -> \b. blah</span></span>
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857
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<pre style="margin: 0;">+<span id="LC857" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in case x of</span></span>
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858
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<pre style="margin: 0;">+<span id="LC858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A -> j True</span></span>
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859
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> B -> \c. blah</span></span>
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860
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> C -> j False</span></span>
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861
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<pre style="margin: 0;">+<span id="LC861" class="line" lang="haskell"></span>
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862
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and suppose the join point is too big to inline. Now, what is the</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;">arity of f? If we inlined the join point, we'd definitely say "arity</span></span>
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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;">2" because we are prepared to push case-scrutinisation inside a</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;">lambda. But currently the join point totally messes all that up,</span></span>
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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;">because (thought of as a vanilla let-binding) the arity pinned on 'j'</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;">is just 1.</span></span>
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868
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<pre style="margin: 0;">+<span id="LC868" class="line" lang="haskell"></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;">Why don't we eta-expand j? Because of</span></span>
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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;">Note [Do not eta-expand join points] in GHC.Core.Opt.Simplify.Utils</span></span>
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<pre style="margin: 0;">+<span id="LC871" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Even if we don't eta-expand j, why is its arity only 1?</span></span>
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<pre style="margin: 0;">+<span id="LC873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See invariant 2b in Note [Invariants on join points] in GHC.Core.</span></span>
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<pre style="margin: 0;">+<span id="LC875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we do this:</span></span>
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<pre style="margin: 0;">+<span id="LC876" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Treat the RHS of a join-point binding, /after/ stripping off</span></span>
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> join-arity lambda-binders, as very like the body of the let.</span></span>
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> More precisely, do andArityType with the arityType from the</span></span>
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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="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="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="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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<pre style="margin: 0;">+<span id="LC888" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> no sense to say that (say) the arityType of (j False) is ABot 0.</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;"> Bad things happen. So we keep track of the in-scope join-point Ids</span></span>
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<pre style="margin: 0;">+<span id="LC890" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in ae_join.</span></span>
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<pre style="margin: 0;">+<span id="LC891" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC892" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This will make f, above, have arity 2. Then, we'll eta-expand it thus:</span></span>
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<pre style="margin: 0;">+<span id="LC893" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC894" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x eta = (join j y = ... in case x of ...) eta</span></span>
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<pre style="margin: 0;">+<span id="LC895" class="line" lang="haskell"></span>
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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;">and the Simplify will automatically push that application of eta into</span></span>
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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;">the join points.</span></span>
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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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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;">An alternative (roughly equivalent) idea would be to carry an</span></span>
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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;">environment mapping let-bound Ids to their ArityType.</span></span>
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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;">-}</span></span>
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902
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<pre style="margin: 0;">+<span id="LC902" class="line" lang="haskell"></span>
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903
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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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904
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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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905
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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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906
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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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907
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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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908
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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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910
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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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<td class="diff-line-num new new_line" data-linenumber="911" 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">
911
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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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913
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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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914
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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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915
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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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916
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<pre style="margin: 0;">+<span id="LC916" class="line" lang="haskell"></span>
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819
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917
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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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918
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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">@@ -912,6 +1010,25 @@ which we want to lead to code like</td>
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912
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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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913
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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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914
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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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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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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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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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<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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<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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1033
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<pre style="margin: 0;"> <span id="LC1033" class="line" lang="haskell"></span>
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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">@@ -924,11 +1041,16 @@ to re-add floats on the top.</td>
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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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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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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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<pre style="margin: 0;">-<span id="LC927" 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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<pre style="margin: 0;">-<span id="LC928" 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="LC929" 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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<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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<pre style="margin: 0;">+<span id="LC1046" class="line" lang="haskell"></span>
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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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<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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<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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<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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<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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932
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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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<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">@@ -939,21 +1061,23 @@ etaExpand :: Arity -- ^ Result should have this number of value arg</td>
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939
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1061
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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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1063
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<pre style="margin: 0;"> <span id="LC1063" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC942" 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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943
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<pre style="margin: 0;">-<span id="LC943" 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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944
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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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945
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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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946
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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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947
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<pre style="margin: 0;">-<span id="LC947" 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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948
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<pre style="margin: 0;">-<span id="LC948" 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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949
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<pre style="margin: 0;">-<span id="LC949" 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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950
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<pre style="margin: 0;">-<span id="LC950" 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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951
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<pre style="margin: 0;">-<span id="LC951" 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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<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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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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<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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1075
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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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<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]) $</span></span>
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<pre style="margin: 0;"> <span id="LC1077" class="line" lang="haskell"> <span class="n" style="color: #333;">retick</span> <span class="o" style="font-weight: 600;">$</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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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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<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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956
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<pre style="margin: 0;">-<span id="LC956" 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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<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">@@ -1052,7 +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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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;">-- 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="LC1055" 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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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;">-- ^ How many value arguments to eta-expand</span></span>
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1057
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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="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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1058
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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">@@ -1064,36 +1188,29 @@ mkEtaWW</td>
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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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1065
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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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1066
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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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1067
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<pre style="margin: 0;">-<span id="LC1067" 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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1068
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<pre style="margin: 0;">-<span id="LC1068" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="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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1069
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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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1070
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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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1071
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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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1072
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<pre style="margin: 0;">-<span id="LC1072" 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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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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1073
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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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1074
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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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1075
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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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1076
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<pre style="margin: 0;">-<span id="LC1076" 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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1077
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<pre style="margin: 0;">-<span id="LC1077" 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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1078
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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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1079
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<pre style="margin: 0;">-<span id="LC1079" 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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1080
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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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1081
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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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1082
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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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1083
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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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1084
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<pre style="margin: 0;">-<span id="LC1084" 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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1085
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<pre style="margin: 0;">-<span id="LC1085" 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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1086
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<pre style="margin: 0;">-<span id="LC1086" 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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1087
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<pre style="margin: 0;">-<span id="LC1087" 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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1088
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<pre style="margin: 0;">-<span id="LC1088" 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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1089
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<pre style="margin: 0;">-<span id="LC1089" 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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1090
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<pre style="margin: 0;">-<span id="LC1090" 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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1091
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<pre style="margin: 0;">-<span id="LC1091" 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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1092
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<pre style="margin: 0;">-<span id="LC1092" 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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1093
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<pre style="margin: 0;">-<span id="LC1093" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- covar case:</span></span>
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1094
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<pre style="margin: 0;">-<span id="LC1094" 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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1095
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<pre style="margin: 0;">-<span id="LC1095" 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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1096
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<pre style="margin: 0;">-<span id="LC1096" 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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<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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1097
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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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1098
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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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1099
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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 old_line" data-linenumber="1101" 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="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">@@ -1101,9 +1218,11 @@ mkEtaWW orig_n ppr_orig_expr in_scope orig_ty</td>
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1101
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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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1102
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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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1103
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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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1104
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<pre style="margin: 0;">-<span id="LC1104" 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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1105
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<pre style="margin: 0;">-<span id="LC1105" 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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1106
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<pre style="margin: 0;">-<span id="LC1106" 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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1107
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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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1108
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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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1109
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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">@@ -1117,12 +1236,12 @@ mkEtaWW orig_n ppr_orig_expr in_scope orig_ty</td>
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1117
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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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1118
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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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1119
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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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1120
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<pre style="margin: 0;">-<span id="LC1120" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="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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1121
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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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1122
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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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1123
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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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1124
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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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1125
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<pre style="margin: 0;">-<span id="LC1125" 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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1126
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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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1127
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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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1128
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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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<li id="aa79261abf782f3dc603af7fbd5c4b08ed3ddb88">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f56cffffb7bc75c771f82ad231585aa894b42e7a...818cb9a0967fe7ffbce287a32afaa48bdc3cc8c0#aa79261abf782f3dc603af7fbd5c4b08ed3ddb88"><strong>compiler/GHC/Core/Opt/ConstantFold.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1519" 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="1519" 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">@@ -1519,18 +1519,40 @@ match_cstring_length env id_unf _ [lit1]</td>
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1519
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1519
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<pre style="margin: 0;"> <span id="LC1519" class="line" lang="haskell"><span class="n" style="color: #333;">match_cstring_length</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1520
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1520
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<pre style="margin: 0;"> <span id="LC1520" class="line" lang="haskell"></span>
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1521
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1521
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<pre style="margin: 0;"> <span id="LC1521" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------------------------------------------</span></span>
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1522
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<pre style="margin: 0;">-<span id="LC1522" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The rule is this:</span></span>
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<pre style="margin: 0;">-<span id="LC1523" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- inline f_ty (f a b c) = <f's unfolding> a b c</span></span>
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<pre style="margin: 0;">-<span id="LC1524" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (if f has an unfolding, EVEN if it's a loop breaker)</span></span>
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<pre style="margin: 0;">-<span id="LC1525" 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="LC1526" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It's important to allow the argument to 'inline' to have args itself</span></span>
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<pre style="margin: 0;">-<span id="LC1527" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (a) because its more forgiving to allow the programmer to write</span></span>
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<pre style="margin: 0;">-<span id="LC1528" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- inline f a b c</span></span>
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<pre style="margin: 0;">-<span id="LC1529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- or inline (f a b c)</span></span>
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<pre style="margin: 0;">-<span id="LC1530" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (b) because a polymorphic f wll get a type argument that the</span></span>
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<pre style="margin: 0;">-<span id="LC1531" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- programmer can't avoid</span></span>
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<pre style="margin: 0;">-<span id="LC1532" 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="LC1533" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Also, don't forget about 'inline's type argument!</span></span>
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<pre style="margin: 0;">+<span id="LC1522" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [inlineId magic]</span></span>
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<pre style="margin: 0;">+<span id="LC1523" 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="LC1524" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The call 'inline f' arranges that 'f' is inlined, regardless of</span></span>
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<pre style="margin: 0;">+<span id="LC1525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">nits size. More precisely, the call 'inline f' rewrites to the</span></span>
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<pre style="margin: 0;">+<span id="LC1526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">right-hand side of 'f's definition. This allows the programmer to</span></span>
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<pre style="margin: 0;">+<span id="LC1527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">control inlining from a particular call site rather than the</span></span>
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<pre style="margin: 0;">+<span id="LC1528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">definition site of the function.</span></span>
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<pre style="margin: 0;">+<span id="LC1529" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The moving parts are simple:</span></span>
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<pre style="margin: 0;">+<span id="LC1531" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* A very simple definition in the library base:GHC.Magic</span></span>
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<pre style="margin: 0;">+<span id="LC1533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# NOINLINE[0] inline #-}</span></span>
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<pre style="margin: 0;">+<span id="LC1534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inline :: a -> a</span></span>
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1535
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<pre style="margin: 0;">+<span id="LC1535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inline x = x</span></span>
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<pre style="margin: 0;">+<span id="LC1536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So in phase 0, 'inline' will be inlined, so its use imposes</span></span>
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1537
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<pre style="margin: 0;">+<span id="LC1537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> no overhead.</span></span>
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1538
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<pre style="margin: 0;">+<span id="LC1538" class="line" lang="haskell"></span>
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1539
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<pre style="margin: 0;">+<span id="LC1539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* A rewrite rule, in GHC.Core.Opt.ConstantFold, which makes</span></span>
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1540
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<pre style="margin: 0;">+<span id="LC1540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (inline f) inline, implemented by match_inline.</span></span>
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1541
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<pre style="margin: 0;">+<span id="LC1541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The rule for the 'inline' function is this:</span></span>
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1542
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<pre style="margin: 0;">+<span id="LC1542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inline f_ty (f a b c) = <f's unfolding> a b c</span></span>
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1543
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<pre style="margin: 0;">+<span id="LC1543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (if f has an unfolding, EVEN if it's a loop breaker)</span></span>
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1544
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<pre style="margin: 0;">+<span id="LC1544" class="line" lang="haskell"></span>
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1545
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<pre style="margin: 0;">+<span id="LC1545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> It's important to allow the argument to 'inline' to have args itself</span></span>
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1546
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<pre style="margin: 0;">+<span id="LC1546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (a) because its more forgiving to allow the programmer to write</span></span>
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1547
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<pre style="margin: 0;">+<span id="LC1547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> either inline f a b c</span></span>
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1548
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<pre style="margin: 0;">+<span id="LC1548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> or inline (f a b c)</span></span>
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<pre style="margin: 0;">+<span id="LC1549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (b) because a polymorphic f wll get a type argument that the</span></span>
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1550
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<pre style="margin: 0;">+<span id="LC1550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> programmer can't avoid, so the call may look like</span></span>
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1551
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<pre style="margin: 0;">+<span id="LC1551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inline (map @Int @Bool) g xs</span></span>
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1552
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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="cm" style="color: #998; font-style: italic;"> Also, don't forget about 'inline's type argument!</span></span>
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1554
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<pre style="margin: 0;">+<span id="LC1554" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1555
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<pre style="margin: 0;">+<span id="LC1555" class="line" lang="haskell"></span>
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1534
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<pre style="margin: 0;"> <span id="LC1556" class="line" lang="haskell"><span class="n" style="color: #333;">match_inline</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Expr</span> <span class="kt" style="color: #458; font-weight: 600;">CoreBndr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Expr</span> <span class="kt" style="color: #458; font-weight: 600;">CoreBndr</span><span class="p">)</span></span>
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1535
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<pre style="margin: 0;"> <span id="LC1557" class="line" lang="haskell"><span class="n" style="color: #333;">match_inline</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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1536
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1558
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<pre style="margin: 0;"> <span id="LC1558" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">f</span><span class="p">,</span> <span class="n" style="color: #333;">args1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">collectArgs</span> <span class="n" style="color: #333;">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">@@ -1540,7 +1562,7 @@ match_inline (Type _ : e : _)</td>
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1540
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1562
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<pre style="margin: 0;"> <span id="LC1562" class="line" lang="haskell"></span>
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1541
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1563
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<pre style="margin: 0;"> <span id="LC1563" class="line" lang="haskell"><span class="n" style="color: #333;">match_inline</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1542
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1564
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<pre style="margin: 0;"> <span id="LC1564" class="line" lang="haskell"></span>
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1543
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<pre style="margin: 0;">-<span id="LC1543" class="line" lang="haskell"></span>
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1565
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<pre style="margin: 0;">+<span id="LC1565" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------------------------------------------</span></span>
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1544
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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;">-- See Note [magicDictId magic] in "GHC.Types.Id.Make"</span></span>
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1545
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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;">-- for a description of what is going on here.</span></span>
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1546
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1568
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<pre style="margin: 0;"> <span id="LC1568" class="line" lang="haskell"><span class="n" style="color: #333;">match_magicDict</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Expr</span> <span class="kt" style="color: #458; font-weight: 600;">CoreBndr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Expr</span> <span class="kt" style="color: #458; font-weight: 600;">CoreBndr</span><span class="p">)</span></span>
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<li id="f168a93cde5e2aec2441d6331dfe500172df4af3">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f56cffffb7bc75c771f82ad231585aa894b42e7a...818cb9a0967fe7ffbce287a32afaa48bdc3cc8c0#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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46
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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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48
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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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49
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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="diff-line-num unfold js-unfold new_line" data-linenumber="707" 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">@@ -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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<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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800
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<pre style="margin: 0;"> <span id="LC800" class="line" lang="haskell"></span>
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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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803
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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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804
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<pre style="margin: 0;"> <span id="LC804" class="line" lang="haskell"></span>
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805
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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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806
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806
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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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<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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<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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<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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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"></span>
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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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<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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<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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847
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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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853
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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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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Zap call arity info. We have used it by now (via</span></span>
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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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<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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<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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<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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<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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<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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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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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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<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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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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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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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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898
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<pre style="margin: 0;"> <span id="LC898" class="line" lang="haskell"></span>
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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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<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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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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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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1929
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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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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="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="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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3837
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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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3832
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3838
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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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3833
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3839
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<pre style="margin: 0;"> <span id="LC3839" class="line" lang="haskell"></span>
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3834
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3840
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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/f56cffffb7bc75c771f82ad231585aa894b42e7a...818cb9a0967fe7ffbce287a32afaa48bdc3cc8c0#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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<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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<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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<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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<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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<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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<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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<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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<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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<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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<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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1577
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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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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;"><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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1570
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1579
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<pre style="margin: 0;"> <span id="LC1579" class="line" lang="haskell"></span>
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1571
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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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1572
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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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1573
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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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1574
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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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1575
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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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1576
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1580
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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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1577
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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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1579
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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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1580
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<pre style="margin: 0;">-<span id="LC1580" class="line" lang="haskell"></span>
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1581
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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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<td class="diff-line-num old old_line" data-linenumber="1582" 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">
1582
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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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<pre style="margin: 0;">-<span id="LC1588" class="line" lang="haskell"></span>
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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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<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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<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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<pre style="margin: 0;">-<span id="LC1592" class="line" lang="haskell"></span>
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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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<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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<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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<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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<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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<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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<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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1597
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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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1624
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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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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;"> 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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1634
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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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1635
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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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1670
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<pre style="margin: 0;">+<span id="LC1670" class="line" lang="haskell"></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;">But note that this won't eta-expand, say</span></span>
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1672
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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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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;">Does it matter not eta-expanding such functions? I'm not sure. Perhaps</span></span>
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1674
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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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1630
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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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1670
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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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1672
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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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1674
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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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1675
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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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1683
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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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<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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<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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<pre style="margin: 0;">-<span id="LC1692" class="line" lang="haskell"></span>
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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/f56cffffb7bc75c771f82ad231585aa894b42e7a...818cb9a0967fe7ffbce287a32afaa48bdc3cc8c0#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/f56cffffb7bc75c771f82ad231585aa894b42e7a...818cb9a0967fe7ffbce287a32afaa48bdc3cc8c0#598aebb67cf4996e7c7414ec0bef247e3b5e0d73"><strong>compiler/GHC/Types/Unique/Supply.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">@@ -48,6 +48,7 @@ import GHC.Utils.Monad</td>
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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;">Control.Monad</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;">Data.Bits</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Char</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.Exts</span><span class="p">(</span> <span class="n" style="color: #333;">inline</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"Unique.h"</span></span>
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<pre style="margin: 0;"> <span id="LC54" 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">@@ -111,8 +112,15 @@ Why doesn't full laziness float out the (\s2...)? Because of</td>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the state hack (#18238).</span></span>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So for this module we switch the state hack off -- it's an example</span></span>
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<pre style="margin: 0;">-<span id="LC114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of when it makes things worse rather than better. Now full laziness</span></span>
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<pre style="margin: 0;">-<span id="LC115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">can float that lambda out, and we get</span></span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of when it makes things worse rather than better. And we use</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">multiShotIO (see Note [multiShotIO]) thus:</span></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mk_supply = multiShotIO $</span></span>
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> unsafeInterleaveIO $</span></span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> genSym >>= \ u -></span></span>
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<pre style="margin: 0;">+<span id="LC121" 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="LC122" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now full laziness can float that lambda out, and we get</span></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $wmkSplitUniqSupply c# s</span></span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = letrec</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">@@ -124,7 +132,7 @@ can float that lambda out, and we get</td>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (# s6, MkSplitUniqSupply ... #)</span></span>
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133
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in unsafeDupableInterleaveIO1 lvl s</span></span>
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126
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134
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"></span>
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127
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<pre style="margin: 0;">-<span id="LC127" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is all terribly delicate. It just so happened that before I</span></span>
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135
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Beofre </span>This is all terribly delicate. It just so happened that before I</span></span>
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128
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136
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fixed #18078, and even with the state-hack still enabled, we were</span></span>
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129
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137
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">getting this:</span></span>
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130
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138
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<pre style="margin: 0;"> <span id="LC138" 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">@@ -146,6 +154,38 @@ bit slower. (Test perf/should_run/UniqLoop had a 20% perf change.)</td>
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146
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154
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Sigh. The test perf/should_run/UniqLoop keeps track of this loop.</span></span>
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156
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Watch it carefully.</span></span>
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [multiShotIO]</span></span>
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The function multiShotIO :: IO a -> IO a</span></span>
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">says that the argument IO action may be invoked repeatedly (is</span></span>
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">multi-shot), and so there should be a multi-shot lambda around it.</span></span>
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It's quite easy to define, in any module with `-fno-state-hack`:</span></span>
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> multiShotIO :: IO a -> IO a</span></span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# INLINE multiShotIO #-}</span></span>
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> multiShotIO (IO m) = IO (\s -> inline m s)</span></span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Because of -fno-state-hack, that '\s' will be multi-shot. Now,</span></span>
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169
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ignoring the casts from IO:</span></span>
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> multiShotIO (\ss{one-shot}. blah)</span></span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ==> let m = \ss{one-shot}. blah</span></span>
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172
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in \s. inline m s</span></span>
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173
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ==> \s. (\ss{one-shot}.blah) s</span></span>
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174
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ==> \s. blah[s/ss]</span></span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"></span>
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176
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The magic `inline` function does two things</span></span>
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177
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* It prevents eta reduction. If we wrote just</span></span>
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178
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> multiShotIO (IO m) = IO (\s -> m s)</span></span>
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179
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the lamda would eta-reduce to 'm' and all would be lost.</span></span>
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180
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"></span>
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181
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* It helps ensure that 'm' really does inline.</span></span>
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182
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"></span>
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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that 'inline' evaporates in phase 0. See Note [inlineIdMagic]</span></span>
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184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in GHC.Core.Opt.ConstantFold.match_inline.</span></span>
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185
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="haskell"></span>
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186
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The INLINE pragma on multiShotIO is very important, else the</span></span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'inline' call will evaporate when compiling the module that</span></span>
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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">defines 'multiShotIO', before it is ever exported.</span></span>
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149
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189
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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150
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190
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="haskell"></span>
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151
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191
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<pre style="margin: 0;"> <span id="LC191" 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">@@ -176,12 +216,18 @@ mkSplitUniqSupply c</td>
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176
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216
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is one of the most hammered bits in the whole compiler</span></span>
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177
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Optimising the unique supply]</span></span>
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: Use unsafeInterleaveIO for thread-safety.</span></span>
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<pre style="margin: 0;">-<span id="LC179" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_supply</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unsafeInterleaveIO</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_supply</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">multiShotIO</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="haskell"> <span class="n" style="color: #333;">unsafeInterleaveIO</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"> <span class="n" style="color: #333;">genSym</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;">u</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_supply</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;">s1</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_supply</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;">s2</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC224" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkSplitUniqSupply</span> <span class="p">(</span><span class="n" style="color: #333;">mask</span> <span class="o" style="font-weight: 600;">.|.</span> <span class="n" style="color: #333;">u</span><span class="p">)</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">s2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC225" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="haskell"><span class="n" style="color: #333;">multiShotIO</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC227" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE multiShotIO #-}</span></span>
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<pre style="margin: 0;">+<span id="LC228" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [multiShotIO]x</span></span>
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"><span class="n" style="color: #333;">multiShotIO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">inline</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">s</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="n" style="color: #333;">unsafe</span> <span class="s" style="color: #d14;">"genSym"</span> <span class="n" style="color: #333;">genSym</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="n" style="color: #333;">unsafe</span> <span class="s" style="color: #d14;">"initGenSym"</span> <span class="n" style="color: #333;">initUniqSupply</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f56cffffb7bc75c771f82ad231585aa894b42e7a...818cb9a0967fe7ffbce287a32afaa48bdc3cc8c0#c08d10d15b9eec0bfe065f755c16bf30c0f812f2"><strong>testsuite/tests/simplCore/should_compile/T18328.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;">T18328</span> <span class="kr" style="font-weight: 600;">where</span></span>
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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="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC4" 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;">ys</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE j #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"> <span class="n" style="color: #333;">j</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="mi" style="color: #099;">3</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">((</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="n" style="color: #333;">ys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">((</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="n" style="color: #333;">ys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">((</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="n" style="color: #333;">ys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">((</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="n" style="color: #333;">ys</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">((</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="n" style="color: #333;">ys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">((</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="n" style="color: #333;">ys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">((</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="n" style="color: #333;">ys</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">j</span> <span class="mi" style="color: #099;">2</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">j</span> <span class="mi" style="color: #099;">3</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="mi" style="color: #099;">3</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">j</span> <span class="mi" style="color: #099;">4</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">((</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="n" style="color: #333;">ys</span><span class="p">)</span></span></pre>
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<li id="0cdebe5bde9afbd0b1a242c68e3fd1eece347d36">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f56cffffb7bc75c771f82ad231585aa894b42e7a...818cb9a0967fe7ffbce287a32afaa48bdc3cc8c0#0cdebe5bde9afbd0b1a242c68e3fd1eece347d36"><strong>testsuite/tests/simplCore/should_compile/T18328.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: 69, types: 61, coercions: 0, joins: 1/1}</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: 42, types: 28, coercions: 0, joins: 1/1}</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">T18328.$wf [InlPrag=NOUSERINLINE[2]]</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> :: forall {a}. GHC.Prim.Int# -> [a] -> [a] -> [a]</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">[GblId,</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> Arity=3,</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> Str=<S,U><S,U><L,1*U>,</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> WorkFree=True, Expandable=True, Guidance=IF_ARGS [182 0 0] 312 0}]</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">T18328.$wf</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> = \ (@a) (ww :: GHC.Prim.Int#) (w :: [a]) (w1 :: [a]) -></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> join {</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> $wj [InlPrag=NOINLINE, Dmd=<L,1*C1(U)>]</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> :: forall {p}. GHC.Prim.Void# -> [a]</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> [LclId[JoinId(2)], Arity=1, Str=<L,A>, Unf=OtherCon []]</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> $wj (@p) _ [Occ=Dead, OS=OneShot]</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"> = case ww of {</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"> __DEFAULT -> ++ @a w (++ @a w (++ @a w w1));</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"> 3# -> ++ @a w (++ @a w (++ @a w (++ @a w w1)))</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> } } in</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext"> case ww of {</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext"> __DEFAULT -> ++ @a w w1;</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"> 1# -> jump $wj @Integer GHC.Prim.void#;</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> 2# -> jump $wj @Integer GHC.Prim.void#;</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext"> 3# -> jump $wj @Integer GHC.Prim.void#</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"> }</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">-- RHS size: {terms: 11, types: 10, coercions: 0, joins: 0/0}</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext">f [InlPrag=NOUSERINLINE[2]] :: forall a. Int -> [a] -> [a] -> [a]</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext">[GblId,</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext"> Arity=3,</span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext"> Str=<S(S),1*U(U)><S,U><L,1*U>,</span>
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<pre style="margin: 0;">+<span id="LC37" 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="LC38" class="line" lang="plaintext"> WorkFree=True, Expandable=True,</span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext"> Guidance=ALWAYS_IF(arity=3,unsat_ok=True,boring_ok=False)</span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext"> Tmpl= \ (@a)</span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext"> (w [Occ=Once!] :: Int)</span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="plaintext"> (w1 [Occ=Once] :: [a])</span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext"> (w2 [Occ=Once] :: [a]) -></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="plaintext"> case w of { GHC.Types.I# ww1 [Occ=Once] -></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="plaintext"> T18328.$wf @a ww1 w1 w2</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">f = \ (@a) (w :: Int) (w1 :: [a]) (w2 :: [a]) -></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext"> case w of { GHC.Types.I# ww1 -> T18328.$wf @a ww1 w1 w2 }</span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="plaintext">-- RHS size: {terms: 1, types: 0, coercions: 0, joins: 0/0}</span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext">T18328.$trModule4 :: GHC.Prim.Addr#</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext">[GblId,</span>
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<pre style="margin: 0;">+<span id="LC53" 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="LC54" class="line" lang="plaintext"> WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 20 0}]</span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext">T18328.$trModule4 = "main"#</span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="plaintext">-- RHS size: {terms: 2, types: 0, coercions: 0, joins: 0/0}</span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="plaintext">T18328.$trModule3 :: GHC.Types.TrName</span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext">[GblId,</span>
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<pre style="margin: 0;">+<span id="LC60" 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="LC61" class="line" lang="plaintext"> WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 10 20}]</span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="plaintext">T18328.$trModule3 = GHC.Types.TrNameS T18328.$trModule4</span>
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63
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC64" 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="LC65" class="line" lang="plaintext">T18328.$trModule2 :: GHC.Prim.Addr#</span>
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66
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="plaintext">[GblId,</span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="plaintext"> Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,</span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="plaintext"> WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 30 0}]</span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="plaintext">T18328.$trModule2 = "T18328"#</span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC71" 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="LC72" class="line" lang="plaintext">T18328.$trModule1 :: GHC.Types.TrName</span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="plaintext">[GblId,</span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="plaintext"> Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,</span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="plaintext"> WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 10 20}]</span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="plaintext">T18328.$trModule1 = GHC.Types.TrNameS T18328.$trModule2</span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="plaintext">-- RHS size: {terms: 3, types: 0, coercions: 0, joins: 0/0}</span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="plaintext">T18328.$trModule :: GHC.Types.Module</span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="plaintext">[GblId,</span>
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<pre style="margin: 0;">+<span id="LC81" 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="LC82" class="line" lang="plaintext"> WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 10 30}]</span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="plaintext">T18328.$trModule</span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="plaintext"> = GHC.Types.Module T18328.$trModule3 T18328.$trModule1</span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f56cffffb7bc75c771f82ad231585aa894b42e7a...818cb9a0967fe7ffbce287a32afaa48bdc3cc8c0#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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<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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<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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<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/f56cffffb7bc75c771f82ad231585aa894b42e7a...818cb9a0967fe7ffbce287a32afaa48bdc3cc8c0#567031a571455045b61cacbcb7f3806ae34cd4f6"><strong>testsuite/tests/simplCore/should_compile/T18355.stderr</strong></a>
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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.$trModule4 = "main"#</span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext">-- RHS size: {terms: 2, types: 0, coercions: 0, joins: 0/0}</span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext">T18355.$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.$trModule1</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f56cffffb7bc75c771f82ad231585aa894b42e7a...818cb9a0967fe7ffbce287a32afaa48bdc3cc8c0#fc07c260b75644727a8cdc1af5c861a44d4bfb5e"><strong>testsuite/tests/simplCore/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -328,4 +328,6 @@ test('T18231', [ only_ways(['optasm']), grep_errmsg(r'^[\w\.]+ ::.*->.*') ], com</td>
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># Cast WW</span></span>
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<pre style="margin: 0;"> <span id="LC329" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17673</span><span class="p">',</span> <span class="p">[</span> <span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">optasm</span><span class="p">']),</span> <span class="nv" style="color: #008080;">grep_errmsg</span><span class="p">(</span><span class="nv" style="color: #008080;">r</span><span class="p">'</span><span class="s1" style="color: #d14;">^</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">\</span><span class="s1" style="color: #d14;">w+</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">\</span><span class="s1" style="color: #d14;">.</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">\</span><span class="s1" style="color: #d14;">$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="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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331
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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></pre>
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