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<h3>
Sebastian Graf pushed to branch wip/T18870
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/93aa155c2b48d966f4b8df43483a00339e11eb6d">93aa155c</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-11-11T11:46:50+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Arity: Emit "Exciting arity" warning only after second iteration (#18937)
See Note [Exciting arity] why we emit the warning at all and why we only
do after the second iteration now.
Fixes #18937.
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<h4>2 changed files:</h4>
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<li class="file-stats">
<a href="#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
compiler/GHC/Core/Opt/Arity.hs
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<a href="#d67c329c07c6c486d54ae87ffc8be9188c198bcc">
testsuite/tests/arityanal/should_compile/all.T
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<h4>Changes:</h4>
<li id="c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/93aa155c2b48d966f4b8df43483a00339e11eb6d#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999"><strong>compiler/GHC/Core/Opt/Arity.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">@@ -639,26 +639,26 @@ findRhsArity :: DynFlags -> Id -> CoreExpr -> Arity -> ArityType</td>
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- so it is safe to expand e ==> (\x1..xn. e x1 .. xn)</span></span>
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (b) if is_bot=True, then e applied to n args is guaranteed bottom</span></span>
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<pre style="margin: 0;"> <span id="LC641" class="line" lang="haskell"><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="LC642" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">step</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">botArityType</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC642" 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">botArityType</span></span></span>
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We always do one step, but usually that produces a result equal to</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- old_arity, and then we stop right away, because old_arity is assumed</span></span>
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<pre style="margin: 0;"> <span id="LC645" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to be sound. In other words, arities should never decrease.</span></span>
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<pre style="margin: 0;"> <span id="LC646" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Result: the common case is that there is just one iteration</span></span>
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC648" 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;">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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<pre style="margin: 0;">-<span id="LC649" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;"><span class="idiff left right">cur_atype</span></span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">div</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC650" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isDeadEndDiv</span> <span class="n" style="color: #333;">div</span><span class="p">)</span> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- the "stop right away" case</span></span>
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<pre style="margin: 0;">-<span id="LC651" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">oss</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_at<span class="idiff left right">ype</span></span> <span class="c1" style="color: #998; font-style: italic;">-- from above</span></span>
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<pre style="margin: 0;">-<span id="LC652" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ne<span class="idiff left">w_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">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="LC653" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC654" class="line" lang="haskell"><span class="o" style="font-weight: 600;"><span class="idiff left">#</span></span><span class="kr" style="font-weight: 600;"><span class="idiff">if</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">defined</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DEBUG</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">-<span id="LC655" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">pprTrace</span></span> <span class="s" style="color: #d14;">"Exciting arity"</span></span>
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<pre style="margin: 0;">-<span id="LC656" class="line" lang="haskell"> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">vcat</span></span><span class="idiff"> </span><span class="p"><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">bndr</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">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">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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<pre style="margin: 0;">-<span id="LC657" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</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">rhs</span></span><span class="p"><span class="idiff right">])</span></span></span>
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<pre style="margin: 0;">-<span id="LC658" class="line" lang="haskell"><span class="o" style="font-weight: 600;"><span class="idiff left">#</span></span><span class="n" style="color: #333;"><span class="idiff right">endif</span></span></span>
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<pre style="margin: 0;">-<span id="LC659" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">go</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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<pre style="margin: 0;">+<span id="LC648" 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">Int</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </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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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;"><span class="idiff left">!</span></span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cur_at</span></span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">div</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isDeadEndDiv</span> <span class="n" style="color: #333;">div</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- the "stop right away" case</span></span>
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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">oss</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_at</span> <span class="c1" style="color: #998; font-style: italic;">-- from above</span></span>
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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ne<span class="idiff left">xt_at</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_at</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_at</span></span></span>
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<pre style="margin: 0;">+<span id="LC653" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC654" class="line" lang="haskell"><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Warn if more than 2 iterations. Why 2? See Note [Exciting arity]</span></span></span>
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<pre style="margin: 0;">+<span id="LC655" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">WARN</span></span><span class="p"><span class="idiff">(</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">debugIsOn</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">n</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">2</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">text</span></span> <span class="s" style="color: #d14;">"Exciting arity"</span></span>
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"> <span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nest</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">2</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">(</span></span></span>
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bndr</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cur_at</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">next_at</span></span></span>
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<pre style="margin: 0;">+<span id="LC658" class="line" lang="haskell"><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhs</span></span><span class="p"><span class="idiff">)</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="LC659" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">go</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="o" style="font-weight: 600;"><span class="idiff">+</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">next_at</span></span></span>
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<pre style="margin: 0;"> <span id="LC660" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC661" class="line" lang="haskell"> <span class="n" style="color: #333;">ne<span class="idiff left">w_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">step</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="LC661" class="line" lang="haskell"> <span class="n" style="color: #333;">ne<span class="idiff left">xt_at</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">step</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cur_at</span></span></span>
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<pre style="margin: 0;"> <span id="LC662" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC663" class="line" lang="haskell"> <span class="n" style="color: #333;">step</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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<pre style="margin: 0;"> <span id="LC664" class="line" lang="haskell"> <span class="n" style="color: #333;">step</span> <span class="n" style="color: #333;">at</span> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "step" (ppr bndr <+> ppr at <+> ppr (arityType env 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">@@ -706,6 +706,30 @@ until it finds a stable arity type. Two wrinkles</td>
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> by the 'am_sigs' field in 'FindRhsArity', and 'lookupSigEnv' in the Var case</span></span>
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of 'arityType'.</span></span>
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<pre style="margin: 0;"> <span id="LC708" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Exciting Arity]</span></span>
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<pre style="margin: 0;">+<span id="LC710" 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="LC711" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The fixed-point iteration in 'findRhsArity' stabilises very quickly in almost</span></span>
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<pre style="margin: 0;">+<span id="LC712" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">all cases. To get notified of cases where we need an usual number of iterations,</span></span>
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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we emit a warning in debug mode, so that we can investigate and make sure that</span></span>
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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we really can't do better. It's a gross hack, but catches real bugs (#18870).</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="cm" style="color: #998; font-style: italic;">Now, which number is "unusual"? We pick n > 2. Here's a pretty common and</span></span>
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expected example that takes two iterations and would ruin the specificity</span></span>
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of the warning (from T18937):</span></span>
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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: [Int] -> Int -> Int</span></span>
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f [] = id</span></span>
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<pre style="margin: 0;">+<span id="LC722" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (x:xs) = let y = sum [0..x]</span></span>
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<pre style="margin: 0;">+<span id="LC723" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in \z -> f xs (y + z)</span></span>
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<pre style="margin: 0;">+<span id="LC725" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Fixed-point iteration starts with arity type ⊥ for f. After the first</span></span>
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<pre style="margin: 0;">+<span id="LC726" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">iteration, we get arity type \??.T, e.g. arity 2, because we unconditionally</span></span>
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<pre style="margin: 0;">+<span id="LC727" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'floatIn' the let-binding (see its bottom case). After the second iteration,</span></span>
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<pre style="margin: 0;">+<span id="LC728" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we get arity type \?.T, e.g. arity 1, because now we are no longer allowed</span></span>
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<pre style="margin: 0;">+<span id="LC729" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to floatIn the non-cheap let-binding. Which is all perfectly benign, but</span></span>
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<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">means we do two iterations (well, actually 3 'step's to detect we are stable)</span></span>
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<pre style="margin: 0;">+<span id="LC731" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and don't want to emit the warning.</span></span>
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<pre style="margin: 0;">+<span id="LC732" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC733" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Eta expanding through dictionaries]</span></span>
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<pre style="margin: 0;"> <span id="LC734" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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711
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<pre style="margin: 0;"> <span id="LC735" 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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/93aa155c2b48d966f4b8df43483a00339e11eb6d#d67c329c07c6c486d54ae87ffc8be9188c198bcc"><strong>testsuite/tests/arityanal/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">@@ -20,4 +20,4 @@ test('Arity16', [ only_ways(['optasm']), grep_errmsg('Arity=') ], compile, ['-dn</td>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># Regression tests</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18793</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="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;">-dno-typeable-binds -ddump-simpl -dppr-cols=99999 -dsuppress-uniques</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18870</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="p">],</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-ddebug-output</span><span class="p">'])</span></span>
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23
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<pre style="margin: 0;">-<span id="LC23" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18937</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 class="idiff left">,</span></span><span class="idiff"> </span><span class="nv" style="color: #008080;"><span class="idiff">when</span></span><span class="p"><span class="idiff">(</span></span><span class="nv" style="color: #008080;"><span class="idiff">compiler_debugged</span></span><span class="p"><span class="idiff">(),</span></span><span class="idiff"> </span><span class="nv" style="color: #008080;"><span class="idiff">expect_broken</span></span><span class="p"><span class="idiff">(</span></span><span class="mi" style="color: #099;"><span class="idiff">18937</span></span><span class="p"><span class="idiff right">))</span></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;">-ddebug-output</span><span class="p">'])</span></span></pre>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18937</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="p">],</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-ddebug-output</span><span class="p">'])</span></span></pre>
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