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<h3>
Simon Peyton Jones pushed to branch wip/T18347
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90d32db665eb1f722673203d51c9e93021520be9">90d32db6</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-06-18T12:34:22+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a buglet in Simplify.simplCast
This bug, revealed by #18347, is just a missing update to
sc_hole_ty in simplCast. I'd missed a code path when I
made the recentchanges in
commit 6d49d5be904c0c01788fa7aae1b112d5b4dfaf1c
Author: Simon Peyton Jones <simonpj@microsoft.com>
Date: Thu May 21 12:53:35 2020 +0100
Implement cast worker/wrapper properly
The fix is very easy.
Two other minor changes
* Tidy up in SimpleOpt.simple_opt_expr. In fact I think this is an
outright bug, introduced in the fix to #18112: we were simplifying
the same coercion twice *with the same substitution*, which is just
wrong. It'd be a hard bug to trigger, so I just fixed it; less code
too.
* Better debug printing of ApplyToVal
</pre>
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<h4>5 changed files:</h4>
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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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<a href="#11ffe98a94d798427bc600e4fcfe899407536346">
compiler/GHC/Core/SimpleOpt.hs
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+
testsuite/tests/simplCore/should_compile/T18347.hs
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<li class="file-stats">
<a href="#fc07c260b75644727a8cdc1af5c861a44d4bfb5e">
testsuite/tests/simplCore/should_compile/all.T
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<h4>Changes:</h4>
<li id="f168a93cde5e2aec2441d6331dfe500172df4af3">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90d32db665eb1f722673203d51c9e93021520be9#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">@@ -1405,7 +1405,8 @@ simplCast env body co0 cont0</td>
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<pre style="margin: 0;"> <span id="LC1405" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="cp" style="color: #999; font-weight: 600;">{-#SCC "addCoerce-pushCoValArg" #-}</span></span>
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<pre style="margin: 0;"> <span id="LC1406" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">tail'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addCoerceM</span> <span class="n" style="color: #333;">m_co2</span> <span class="n" style="color: #333;">tail</span></span>
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<pre style="margin: 0;"> <span id="LC1407" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isReflCo</span> <span class="n" style="color: #333;">co1</span></span>
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1408
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<pre style="margin: 0;">-<span id="LC1408" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">cont</span> <span class="p">{</span> <span class="n" style="color: #333;">sc_cont</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tail'</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1408" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">cont</span> <span class="p">{</span> <span class="n" style="color: #333;">sc_cont</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tail'</span></span>
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<pre style="margin: 0;">+<span id="LC1409" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sc_hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionLKind</span> <span class="n" style="color: #333;">co</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC1410" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Avoid simplifying if possible;</span></span>
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<pre style="margin: 0;"> <span id="LC1411" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Avoiding exponential behaviour]</span></span>
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<pre style="margin: 0;"> <span id="LC1412" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90d32db665eb1f722673203d51c9e93021520be9#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">@@ -218,9 +218,10 @@ instance Outputable SimplCont where</td>
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<pre style="margin: 0;"> <span id="LC218" 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;">TickIt</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">cont</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"TickIt"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cont</span></span>
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ApplyToTy</span> <span class="p">{</span> <span class="n" style="color: #333;">sc_arg_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">sc_cont</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cont</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"ApplyToTy"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprParendType</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cont</span></span>
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<pre style="margin: 0;">-<span id="LC221" 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;">ApplyToVal</span> <span class="p">{</span> <span class="n" style="color: #333;">sc_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg</span><span class="p">,</span> <span class="n" style="color: #333;">sc_dup</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dup</span><span class="p">,</span> <span class="n" style="color: #333;">sc_cont</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cont</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC222" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"ApplyToVal"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">dup</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprParendExpr</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC223" 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;">cont</span></span>
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<pre style="margin: 0;">+<span id="LC221" 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;">ApplyToVal</span> <span class="p">{</span> <span class="n" style="color: #333;">sc_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg</span><span class="p">,</span> <span class="n" style="color: #333;">sc_dup</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dup</span><span class="p">,</span> <span class="n" style="color: #333;">sc_cont</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cont</span><span class="p">,</span> <span class="n" style="color: #333;">sc_hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hole_ty</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"ApplyToVal"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">dup</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"hole"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hole_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">pprParendExpr</span> <span class="n" style="color: #333;">arg</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC224" 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;">cont</span></span>
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<pre style="margin: 0;"> <span id="LC225" 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;">StrictBind</span> <span class="p">{</span> <span class="n" style="color: #333;">sc_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">sc_cont</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cont</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"StrictBind"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">b</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;">cont</span></span>
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<pre style="margin: 0;"> <span id="LC227" 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;">StrictArg</span> <span class="p">{</span> <span class="n" style="color: #333;">sc_fun</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ai</span><span class="p">,</span> <span class="n" style="color: #333;">sc_cont</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cont</span> <span class="p">})</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90d32db665eb1f722673203d51c9e93021520be9#11ffe98a94d798427bc600e4fcfe899407536346"><strong>compiler/GHC/Core/SimpleOpt.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -210,6 +210,7 @@ simple_opt_expr env expr</td>
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<pre style="margin: 0;"> <span id="LC210" 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;">substInScope</span> <span class="n" style="color: #333;">subst</span></span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"> <span class="n" style="color: #333;">in_scope_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">in_scope</span><span class="p">,</span> <span class="n" style="color: #333;">simpleUnfoldingFun</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC213" 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="LC214" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">clo</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">soe_inl</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simple_opt_clo</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">clo</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -218,17 +219,10 @@ simple_opt_expr env expr</td>
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simple_app</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e1</span> <span class="p">[(</span><span class="n" style="color: #333;">env</span><span class="p">,</span><span class="n" style="color: #333;">e2</span><span class="p">)]</span></span>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="p">(</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC221" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">optCoercion</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">soe_dflags</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></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">getTCvSubst</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">subst</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">go_co</span></span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lit</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Lit</span> <span class="n" style="color: #333;">lit</span></span>
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<pre style="margin: 0;"> <span id="LC224" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tick</span> <span class="n" style="color: #333;">tickish</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;">mkTick</span> <span class="p">(</span><span class="n" style="color: #333;">substTickish</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tickish</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC224" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">go</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="LC225" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- flatten nested casts before calling the coercion optimizer;</span></span>
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<pre style="margin: 0;">-<span id="LC226" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- see #18112 (note that mkCast handles dropping Refl coercions)</span></span>
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<pre style="margin: 0;">-<span id="LC227" class="line" lang="haskell"> <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="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkCast</span> <span class="n" style="color: #333;">e'</span> <span class="p">(</span><span class="n" style="color: #333;">opt_co</span> <span class="p">(</span><span class="n" style="color: #333;">mkTransCo</span> <span class="n" style="color: #333;">co'</span> <span class="n" style="color: #333;">co</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell"> <span class="n" style="color: #333;">e'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkCast</span> <span class="n" style="color: #333;">e'</span> <span class="p">(</span><span class="n" style="color: #333;">opt_co</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC229" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC230" class="line" lang="haskell"> <span class="n" style="color: #333;">opt_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">optCoercion</span> <span class="p">(</span><span class="n" style="color: #333;">soe_dflags</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">getTCvSubst</span> <span class="n" style="color: #333;">subst</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC231" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mk_cast</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Let</span> <span class="n" style="color: #333;">bind</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">simple_opt_bind</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">bind</span> <span class="kt" style="color: #458; font-weight: 600;">NotTopLevel</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">env'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">simple_opt_expr</span> <span class="n" style="color: #333;">env'</span> <span class="n" style="color: #333;">body</span></span>
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<pre style="margin: 0;"> <span id="LC228" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">env'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">bind</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Let</span> <span class="n" style="color: #333;">bind</span> <span class="p">(</span><span class="n" style="color: #333;">simple_opt_expr</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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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="257" 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">@@ -263,6 +257,9 @@ simple_opt_expr env expr</td>
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="haskell"> <span class="n" style="color: #333;">e'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC258" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">env'</span><span class="p">,</span> <span class="n" style="color: #333;">b'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">subst_opt_bndr</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;"> <span id="LC259" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC260" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">----------------------</span></span>
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261
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="haskell"> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">optCoercion</span> <span class="p">(</span><span class="n" style="color: #333;">soe_dflags</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">getTCvSubst</span> <span class="n" style="color: #333;">subst</span><span class="p">)</span> <span class="n" style="color: #333;">co</span></span>
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262
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"></span>
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266
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263
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<pre style="margin: 0;"> <span id="LC263" 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="LC264" class="line" lang="haskell"> <span class="n" style="color: #333;">go_alt</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">con</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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268
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<pre style="margin: 0;"> <span id="LC265" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">con</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">simple_opt_expr</span> <span class="n" style="color: #333;">env'</span> <span class="n" style="color: #333;">rhs</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">@@ -282,6 +279,15 @@ simple_opt_expr env expr</td>
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<pre style="margin: 0;"> <span id="LC279" class="line" lang="haskell"> <span class="n" style="color: #333;">bs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">bs'</span></span>
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<pre style="margin: 0;"> <span id="LC280" class="line" lang="haskell"> <span class="n" style="color: #333;">e'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simple_opt_expr</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="LC281" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC282" class="line" lang="haskell"><span class="n" style="color: #333;">mk_cast</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;">CoercionR</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="LC283" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Like GHC.Core.Utils.mkCast, but does a full reflexivity check.</span></span>
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<pre style="margin: 0;">+<span id="LC284" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mkCast doesn't do that because the Simplifier does (in simplCast)</span></span>
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<pre style="margin: 0;">+<span id="LC285" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- But in SimpleOpt it's nice to kill those nested casts (#18112)</span></span>
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<pre style="margin: 0;">+<span id="LC286" class="line" lang="haskell"><span class="n" style="color: #333;">mk_cast</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;">co1</span><span class="p">)</span> <span class="n" style="color: #333;">co2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mk_cast</span> <span class="n" style="color: #333;">e</span> <span class="p">(</span><span class="n" style="color: #333;">co1</span> <span class="p">`</span><span class="n" style="color: #333;">mkTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC287" class="line" lang="haskell"><span class="n" style="color: #333;">mk_cast</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tick</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Tick</span> <span class="n" style="color: #333;">t</span> <span class="p">(</span><span class="n" style="color: #333;">mk_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="LC288" class="line" lang="haskell"><span class="n" style="color: #333;">mk_cast</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isReflexiveCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC289" 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;">Cast</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC290" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC291" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------------</span></span>
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<pre style="margin: 0;"> <span id="LC292" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- simple_app collects arguments for beta reduction</span></span>
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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"><span class="n" style="color: #333;">simple_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SimpleOptEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SimpleClo</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90d32db665eb1f722673203d51c9e93021520be9#18d7ba796ba6cbfb52c5b835a4363f75ab70250f"><strong>testsuite/tests/simplCore/should_compile/T18347.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;">T18347</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">function</span><span class="p">)</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;">Data.Coerce</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="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">All</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">All</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Encoding</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Encoding</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Char</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">function</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Encoding</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Char</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">All</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">function</span> <span class="n" style="color: #333;">enc</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coerce</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">enc</span> <span class="kr" style="font-weight: 600;">of</span> <span class="kt" style="color: #458; font-weight: 600;">Encoding</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">v</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90d32db665eb1f722673203d51c9e93021520be9#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">@@ -328,3 +328,4 @@ 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;">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></pre>
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