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<h3>
Ben Gamari pushed to branch wip/T18151
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/453aa8531411380cc227a117f64f4d8a1a99aa24">453aa853</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-05-24T22:17:02-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">HsToCore: Eta expand left sections
Strangely, the comment next to this code already alluded to the fact
that even simply eta-expanding will sacrifice laziness. It's quite
unclear how we regressed so far.
See #18151.
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<h4>2 changed files:</h4>
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<li class="file-stats">
<a href="#6bdd5abc649727f2a802bc96ce5c276de19d3726">
compiler/GHC/HsToCore/Expr.hs
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<a href="#dd8561f0b2e04faceab592f6504b9c483c57484a">
testsuite/tests/deSugar/should_run/all.T
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<h4>Changes:</h4>
<li id="6bdd5abc649727f2a802bc96ce5c276de19d3726">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/453aa8531411380cc227a117f64f4d8a1a99aa24#6bdd5abc649727f2a802bc96ce5c276de19d3726"><strong>compiler/GHC/HsToCore/Expr.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">@@ -338,26 +338,25 @@ Then we get</td>
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<pre style="margin: 0;"> <span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That 'g' in the 'in' part is an evidence variable, and when</span></span>
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<pre style="margin: 0;"> <span id="LC339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">converting to core it must become a CO.</span></span>
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<pre style="margin: 0;"> <span id="LC340" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Operator sections. At first it looks as if we can convert</span></span>
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<pre style="margin: 0;">-<span id="LC342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\begin{verbatim}</span></span>
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<pre style="margin: 0;">-<span id="LC343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (expr op)</span></span>
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<pre style="margin: 0;">-<span id="LC344" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\end{verbatim}</span></span>
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<pre style="margin: 0;">-<span id="LC345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to</span></span>
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<pre style="margin: 0;">-<span id="LC346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\begin{verbatim}</span></span>
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<pre style="margin: 0;">-<span id="LC347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> \x -> op expr x</span></span>
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<pre style="margin: 0;">-<span id="LC348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\end{verbatim}</span></span>
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Desugaring operator sections]</span></span>
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<pre style="margin: 0;">+<span id="LC343" 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="LC344" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">At first it looks as if we can convert</span></span>
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (expr op)</span></span>
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">naively to</span></span>
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> \x -> op expr x</span></span>
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<pre style="margin: 0;"> <span id="LC348" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But no! expr might be a redex, and we can lose laziness badly this</span></span>
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<pre style="margin: 0;"> <span id="LC350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">way. Consider</span></span>
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<pre style="margin: 0;">-<span id="LC352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\begin{verbatim}</span></span>
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> map (expr op) xs</span></span>
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<pre style="margin: 0;">-<span id="LC354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\end{verbatim}</span></span>
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<pre style="margin: 0;">-<span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for example. So we convert instead to</span></span>
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<pre style="margin: 0;">-<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\begin{verbatim}</span></span>
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<pre style="margin: 0;">-<span id="LC357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let y = expr in \x -> op y x</span></span>
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<pre style="margin: 0;">-<span id="LC358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\end{verbatim}</span></span>
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<pre style="margin: 0;">-<span id="LC359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If \tr{expr} is actually just a variable, say, then the simplifier</span></span>
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> map (expr op) xs</span></span>
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for example.</span></span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we convert instead to</span></span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let y = expr in \x -> op y x</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If `expr` is actually just a variable, say, then the simplifier</span></span>
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<pre style="margin: 0;"> <span id="LC357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will sort it out.</span></span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See #18151.</span></span>
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<pre style="margin: 0;"> <span id="LC360" 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="LC361" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC362" class="line" lang="haskell"><span class="n" style="color: #333;">dsExpr</span> <span class="n" style="color: #333;">e</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpApp</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">op</span> <span class="n" style="color: #333;">e2</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">@@ -366,17 +365,35 @@ dsExpr e@(OpApp _ e1 op e2)</td>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dsWhenNoErrs</span> <span class="p">(</span><span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">dsLExprNoLP</span> <span class="p">[</span><span class="n" style="color: #333;">e1</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="LC366" class="line" lang="haskell"> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">exprs'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkCoreAppsDs</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"opapp"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="n" style="color: #333;">op'</span> <span class="n" style="color: #333;">exprs'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC367" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC369" class="line" lang="haskell"><span class="n" style="color: #333;">dsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SectionL</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Desugar (e !) to ((!) e)</span></span>
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<pre style="margin: 0;">-<span id="LC370" 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;">op'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">op</span></span>
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<pre style="margin: 0;">-<span id="LC371" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dsWhenNoErrs</span> <span class="p">(</span><span class="n" style="color: #333;">dsLExprNoLP</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC372" class="line" lang="haskell"> <span class="p">(</span><span class="nf" style="color: #900; 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;">mkCoreAppDs</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"sectionl"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="n" style="color: #333;">op'</span> <span class="n" style="color: #333;">expr'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC373" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- dsLExpr (SectionR op expr) -- \ x -> op x expr</span></span>
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- dsExpr (SectionL op expr) === (expr `op`) ~> \y -> op expr y</span></span>
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<pre style="margin: 0;">+<span id="LC369" 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="LC370" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Desugaring operator sections].</span></span>
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- N.B. this also must handle postfix operator sections due to -XPostfixOperators.</span></span>
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"><span class="n" style="color: #333;">dsExpr</span> <span class="n" style="color: #333;">e</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SectionL</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"> <span class="n" style="color: #333;">core_op</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">op</span></span>
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"> <span class="n" style="color: #333;">x_core</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">splitFunTys</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">core_op</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="LC376" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Binary operator section</span></span>
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">x_ty</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">y_ty</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"> <span class="n" style="color: #333;">dsWhenNoErrs</span></span>
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">newSysLocalDsNoLP</span> <span class="p">[</span><span class="n" style="color: #333;">x_ty</span><span class="p">,</span> <span class="n" style="color: #333;">y_ty</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">[</span><span class="n" style="color: #333;">x_id</span><span class="p">,</span> <span class="n" style="color: #333;">y_id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"> <span class="n" style="color: #333;">bindNonRec</span> <span class="n" style="color: #333;">x_id</span> <span class="n" style="color: #333;">x_core</span></span>
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"> <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;">y_id</span> <span class="p">(</span><span class="n" style="color: #333;">mkCoreAppsDs</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"sectionl"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"> <span class="n" style="color: #333;">core_op</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">x_id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">y_id</span><span class="p">]))</span></span>
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Postfix operator section</span></span>
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">x_ty</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkCoreAppDs</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"sectionl"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="n" style="color: #333;">core_op</span> <span class="n" style="color: #333;">x_core</span></span>
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"dsExpr(SectionL)"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- dsExpr (SectionR op expr) === (`op` expr) ~> \x -> op x expr</span></span>
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<pre style="margin: 0;">+<span id="LC392" 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="LC393" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Desugaring operator sections].</span></span>
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<pre style="margin: 0;"> <span id="LC394" class="line" lang="haskell"><span class="n" style="color: #333;">dsExpr</span> <span class="n" style="color: #333;">e</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SectionR</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">op</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC395" class="line" lang="haskell"> <span class="n" style="color: #333;">core_op</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">op</span></span>
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for the type of x, we need the type of op's 2nd argument</span></span>
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<pre style="margin: 0;"> <span id="LC396" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">x_ty</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">y_ty</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitFunTys</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">core_op</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC379" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See comment with SectionL</span></span>
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<pre style="margin: 0;"> <span id="LC397" class="line" lang="haskell"> <span class="n" style="color: #333;">y_core</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC398" class="line" lang="haskell"> <span class="n" style="color: #333;">dsWhenNoErrs</span> <span class="p">(</span><span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">newSysLocalDsNoLP</span> <span class="p">[</span><span class="n" style="color: #333;">x_ty</span><span class="p">,</span> <span class="n" style="color: #333;">y_ty</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC399" class="line" lang="haskell"> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">[</span><span class="n" style="color: #333;">x_id</span><span class="p">,</span> <span class="n" style="color: #333;">y_id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">bindNonRec</span> <span class="n" style="color: #333;">y_id</span> <span class="n" style="color: #333;">y_core</span> <span class="o" style="font-weight: 600;">$</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">@@ -64,4 +64,4 @@ test('T11601', exit_code(1), compile_and_run, [''])</td>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T11747</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-dcore-lint</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T12595</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T13285</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">-<span id="LC67" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18151</span><span class="p">',</span> <span class="nv" style="color: #008080;"><span class="idiff left">expect_broken</span></span><span class="p"><span class="idiff">(</span></span><span class="mi" style="color: #099;"><span class="idiff">18151</span></span><span class="p"><span class="idiff right">)</span>,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18151</span><span class="p">',</span> <span class="nv" style="color: #008080;"><span class="idiff left right">normal</span></span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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