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<h3>
Marge Bot pushed to branch master
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/bfa5698b1ab0190820a2df19487d3d72d3a7924d">bfa5698b</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-06-28T09:21:32-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a typo in Lint
This simple error in GHC.Core.Litn.lintJoinLams meant that
Lint reported bogus errors.
Fixes #18399
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<h4>3 changed files:</h4>
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<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
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+
testsuite/tests/simplCore/should_compile/T18399.hs
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<a href="#fc07c260b75644727a8cdc1af5c861a44d4bfb5e">
testsuite/tests/simplCore/should_compile/all.T
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<h4>Changes:</h4>
<li id="36a42448a83a9d1f6df8475f03ead2eed199dd8e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfa5698b1ab0190820a2df19487d3d72d3a7924d#36a42448a83a9d1f6df8475f03ead2eed199dd8e"><strong>compiler/GHC/Core/Lint.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">@@ -727,15 +727,15 @@ lintJoinLams :: JoinArity -> Maybe Id -> CoreExpr -> LintM (LintedType, UsageEnv</td>
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<pre style="margin: 0;"> <span id="LC727" class="line" lang="haskell"><span class="n" style="color: #333;">lintJoinLams</span> <span class="n" style="color: #333;">join_arity</span> <span class="n" style="color: #333;">enforce</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC728" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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729
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729
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<pre style="margin: 0;"> <span id="LC729" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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730
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<pre style="margin: 0;">-<span id="LC730" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;"><span class="idiff left">rhs</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">lintCoreExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rhs</span></span></span>
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731
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<pre style="margin: 0;">-<span id="LC731" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;"><span class="idiff left">expr</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lintLambda</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">var</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">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">expr</span></span></span>
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730
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<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;"><span class="idiff left">expr</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">lintCoreExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">expr</span></span></span>
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731
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<pre style="margin: 0;">+<span id="LC731" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;"><span class="idiff left">body</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lintLambda</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">var</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">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">body</span></span></span>
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<pre style="margin: 0;"> <span id="LC732" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- N.B. join points can be cast. e.g. we consider ((\x -> ...) `cast` ...)</span></span>
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733
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<pre style="margin: 0;"> <span id="LC733" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to be a join point at join arity 1.</span></span>
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734
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<pre style="margin: 0;">-<span id="LC734" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">_othe</span>r</span> <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;">bndr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">enforce</span> <span class="c1" style="color: #998; font-style: italic;">-- Join point with too few RHS lambdas</span></span>
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735
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<pre style="margin: 0;">-<span id="LC735" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">failWithL</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkBadJoinArityMsg</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">join_arity</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">rhs</span></span>
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736
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<pre style="margin: 0;">-<span id="LC736" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- Future join point, not yet eta-expanded</span></span>
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737
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<pre style="margin: 0;">-<span id="LC737" class="line" lang="haskell"> <span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">markAllJoinsBad</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lintCoreExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rhs</span></span></span>
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738
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<pre style="margin: 0;">-<span id="LC738" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- Body of lambda is not a tail position</span></span>
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734
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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;"><span class="idiff left right">exp</span>r</span> <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;">bndr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">enforce</span> <span class="c1" style="color: #998; font-style: italic;">-- Join point with too few RHS lambdas</span></span>
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">failWithL</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkBadJoinArityMsg</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">join_arity</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">rhs</span></span>
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736
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- Future join point, not yet eta-expanded</span></span>
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737
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">markAllJoinsBad</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lintCoreExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">expr</span></span></span>
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738
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Body of lambda is not a tail position</span></span>
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739
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<pre style="margin: 0;"> <span id="LC739" class="line" lang="haskell"></span>
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740
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<pre style="margin: 0;"> <span id="LC740" class="line" lang="haskell"><span class="n" style="color: #333;">lintIdUnfolding</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC741" class="line" lang="haskell"><span class="n" style="color: #333;">lintIdUnfolding</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">bndr_ty</span> <span class="n" style="color: #333;">uf</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfa5698b1ab0190820a2df19487d3d72d3a7924d#bc290c13049d2260c5d4c0a0568f124b2c2d9999"><strong>testsuite/tests/simplCore/should_compile/T18399.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;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">d</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">d</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE f #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">const</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">const</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">const</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfa5698b1ab0190820a2df19487d3d72d3a7924d#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">@@ -329,3 +329,4 @@ test('T18231', [ only_ways(['optasm']), grep_errmsg(r'^[\w\.]+ ::.*->.*') ], com</td>
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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;">$wf</span><span class="p">')</span> <span class="p">],</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-ddump-simpl -dsuppress-uniques -dppr-cols=9999</span><span class="p">'])</span></span>
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330
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<pre style="margin: 0;"> <span id="LC330" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18078</span><span class="p">',</span> <span class="p">[</span> <span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">optasm</span><span class="p">']),</span> <span class="nv" style="color: #008080;">grep_errmsg</span><span class="p">(</span><span class="nv" style="color: #008080;">r</span><span class="p">'</span><span class="s1" style="color: #d14;">^</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">\</span><span class="s1" style="color: #d14;">w+</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">\</span><span class="s1" style="color: #d14;">.</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">\</span><span class="s1" style="color: #d14;">$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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331
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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>
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332
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18399</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-dcore-lint -O</span><span class="p">'])</span></span></pre>
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