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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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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a7462fb6b8bdd6326a607bbd7b9453eb588193b">9a7462fb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-14T15:35:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">codeGen: Don't discard live case binders in unsafeEqualityProof logic
Previously CoreToStg would unconditionally discard cases of the form:
case unsafeEqualityProof of wild { _ -> rhs }
and rather replace the whole thing with `rhs`. However, in some cases
(see #18227) the case binder is still live, resulting in unbound
occurrences in `rhs`. Fix this by only discarding the case if the case
binder is dead.
Fixes #18227.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e4137c486a3df66b49395beea7efc6e200cc9bac">e4137c48</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-14T15:35:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add tests for #18227
T18227A is the original issue which gave rise to the ticket and depends
upon bytestring. T18227B is a minimized reproducer.
</pre>
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<h4>5 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#d79a8a61508cb6c5f38a23ab2b691bb77306f672">
compiler/GHC/CoreToStg.hs
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<li class="file-stats">
<a href="#98b46afb652ad9b66a276d3c312d1262c3838642">
libraries/base/Unsafe/Coerce.hs
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<li class="file-stats">
<a href="#5a06aef6fcb6a74c694b6c143c8a594036a5daa3">
<span class="new-file">
+
testsuite/tests/codeGen/should_compile/T18227A.hs
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<li class="file-stats">
<a href="#92b55987493ad87843d2d9a12ba3f1bb31cee33f">
<span class="new-file">
+
testsuite/tests/codeGen/should_compile/T18227B.hs
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<li class="file-stats">
<a href="#6b1c188363067aa37c05e3a281dad45535511b14">
testsuite/tests/codeGen/should_compile/all.T
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<h4>Changes:</h4>
<li id="d79a8a61508cb6c5f38a23ab2b691bb77306f672">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/c0e6dee99242eff08420176a36d77b715972f1f2...e4137c486a3df66b49395beea7efc6e200cc9bac#d79a8a61508cb6c5f38a23ab2b691bb77306f672"><strong>compiler/GHC/CoreToStg.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="435" 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">@@ -435,7 +435,10 @@ coreToStgExpr e0@(Case scrut bndr _ alts) = do</td>
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435
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<pre style="margin: 0;"> <span id="LC435" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">stg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StgCase</span> <span class="n" style="color: #333;">scrut2</span> <span class="n" style="color: #333;">bndr</span> <span class="p">(</span><span class="n" style="color: #333;">mkStgAltType</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">alts</span><span class="p">)</span> <span class="n" style="color: #333;">alts2</span></span>
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436
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<pre style="margin: 0;"> <span id="LC436" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See (U2) in Note [Implementing unsafeCoerce] in base:Unsafe.Coerce</span></span>
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437
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">scrut2</span> <span class="kr" style="font-weight: 600;">of</span></span>
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438
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<pre style="margin: 0;">-<span id="LC438" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">StgApp</span> <span class="n" style="color: #333;">id</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">unsafeEqualityProofName</span> <span class="o" style="font-weight: 600;">-></span></span>
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438
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<pre style="margin: 0;">+<span id="LC438" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">StgApp</span> <span class="n" style="color: #333;">id</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">unsafeEqualityProofName</span></span>
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439
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<pre style="margin: 0;">+<span id="LC439" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isDeadBinder</span> <span class="n" style="color: #333;">bndr</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC440" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We can only discard the case if the case-binder is dead</span></span>
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<pre style="margin: 0;">+<span id="LC441" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It usually is, but see #18227</span></span>
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">alts2</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC443" class="line" lang="haskell"> <span class="p">[(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">_co</span><span class="p">],</span> <span class="n" style="color: #333;">rhs</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">rhs</span></span>
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<li id="98b46afb652ad9b66a276d3c312d1262c3838642">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/c0e6dee99242eff08420176a36d77b715972f1f2...e4137c486a3df66b49395beea7efc6e200cc9bac#98b46afb652ad9b66a276d3c312d1262c3838642"><strong>libraries/base/Unsafe/Coerce.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">@@ -106,6 +106,11 @@ several ways</td>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> unsafeEqualityProof to f. As (U5) says, it is implemented as</span></span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> UnsafeRefl so all is good.</span></span>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NB: Don't discard the case if the case-binder is used</span></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case unsafeEqualityProof of wild_xx { UnsafeRefl -></span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...wild_xx...</span></span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> That rarely happens, but see #18227.</span></span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(U3) In GHC.CoreToStg.Prep.cpeRhsE, if we see</span></span>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let x = case unsafeEqualityProof ... of</span></span>
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> UnsafeRefl -> K e</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/c0e6dee99242eff08420176a36d77b715972f1f2...e4137c486a3df66b49395beea7efc6e200cc9bac#5a06aef6fcb6a74c694b6c143c8a594036a5daa3"><strong>testsuite/tests/codeGen/should_compile/T18227A.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;">T18227A</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">kilter</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 class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.ByteString.Internal</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="n" style="color: #333;">kilter</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ByteString</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">ByteString</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">kilter</span> <span class="n" style="color: #333;">ps</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PS</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">createAndTrim</span> <span class="mi" style="color: #099;">1</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;">pure</span> <span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/c0e6dee99242eff08420176a36d77b715972f1f2...e4137c486a3df66b49395beea7efc6e200cc9bac#92b55987493ad87843d2d9a12ba3f1bb31cee33f"><strong>testsuite/tests/codeGen/should_compile/T18227B.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- N.B. These warnings only cause noise in stderr.</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wno-overlapping-patterns -Wno-inaccessible-code #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</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;">module</span> <span class="nn" style="color: #555;">T18227B</span> <span class="kr" style="font-weight: 600;">where</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;">import</span> <span class="nn" style="color: #555;">Unsafe.Coerce</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;">test1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UnsafeEquality</span> <span class="kt" style="color: #458; font-weight: 600;">Int</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;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">test1</span> <span class="n" style="color: #333;">hi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">print</span> <span class="s" style="color: #d14;">"hello"</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE test1 #-}</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">test2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">test2</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">unsafeEqualityProof</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UnsafeEquality</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kt" style="color: #458; font-weight: 600;">Char</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="n" style="color: #333;">proof</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">UnsafeRefl</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">test1</span> <span class="n" style="color: #333;">proof</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/c0e6dee99242eff08420176a36d77b715972f1f2...e4137c486a3df66b49395beea7efc6e200cc9bac#6b1c188363067aa37c05e3a281dad45535511b14"><strong>testsuite/tests/codeGen/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">@@ -89,3 +89,5 @@ test('T14373d', [],</td>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17648</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">makefile_test</span><span class="p">,</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">)</span></span>
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91
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17904</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;">-O</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18227A</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>
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93
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18227B</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></pre>
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