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<h3>

Sebastian Graf pushed to branch wip/T18371

at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>

</h3>

<h4>

Commits:

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<ul>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d568ec5857a649953992006d5b8f3be58e15ba19">d568ec58</a></strong>

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<span>by Sebastian Graf</span>

<i>at 2020-09-23T14:41:55+02:00</i>

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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a regression test for #18609

The egregious performance hits are gone since !4050.

So we fix #18609.

</pre>

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<h4>3 changed files:</h4>

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<a href="#5c5f72a0e8507c2048ea4b17662b4159e9ddfe16">

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+

testsuite/tests/pmcheck/should_compile/T18609.hs

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<a href="#3f008b1075a9766ad5e36cd1cc3e96231e729486">

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+

testsuite/tests/pmcheck/should_compile/T18609.stderr

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<a href="#a52966ece03f9e76a93a2c4ea96b9fb25368723d">

testsuite/tests/pmcheck/should_compile/all.T

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<h4>Changes:</h4>

<li id="5c5f72a0e8507c2048ea4b17662b4159e9ddfe16">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d568ec5857a649953992006d5b8f3be58e15ba19#5c5f72a0e8507c2048ea4b17662b4159e9ddfe16"><strong>testsuite/tests/pmcheck/should_compile/T18609.hs</strong></a>

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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wincomplete-patterns -fforce-recomp #-}</span></span>

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2

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE BangPatterns, GADTs, DataKinds, KindSignatures, EmptyCase #-}</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="cd">-- | All examples from https://arxiv.org/abs/1702.02281</span></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;">GarrigueLeNormand</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;">Data.Kind</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="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">N</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kt" style="color: #458; font-weight: 600;">N</span></span>

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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Plus</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">N</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">N</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">N</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">PlusO</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Plus</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">a</span></span>

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">PlusS</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Plus</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Plus</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="n" style="color: #333;">b</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">c</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SMaybe</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SJust</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">SNothing</span></span>

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16

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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="17" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

17

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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="n" style="color: #333;">trivial</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SMaybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Plus</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="18" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

18

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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">trivial</span> <span class="kt" style="color: #458; font-weight: 600;">SNothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="19" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

19

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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="20" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

20

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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="n" style="color: #333;">trivial2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Plus</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

21

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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">trivial2</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{}</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="22" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

22

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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

23

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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="n" style="color: #333;">easy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SMaybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Plus</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="24" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

24

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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="n" style="color: #333;">easy</span> <span class="kt" style="color: #458; font-weight: 600;">SNothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="25" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

25

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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="26" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

26

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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="n" style="color: #333;">easy2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Plus</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="27" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

27

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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">easy2</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{}</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="28" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

28

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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="29" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

29

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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="n" style="color: #333;">harder</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SMaybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Plus</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="30" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

30

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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="n" style="color: #333;">harder</span> <span class="kt" style="color: #458; font-weight: 600;">SNothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="31" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

31

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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="32" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

32

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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="n" style="color: #333;">harder2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Plus</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="n" style="color: #333;">harder2</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{}</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="34" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="35" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="n" style="color: #333;">invZero</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Plus</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Plus</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">d</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="36" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="n" style="color: #333;">invZero</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span>     <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span>     <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="37" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="n" style="color: #333;">invZero</span>  <span class="kt" style="color: #458; font-weight: 600;">PlusO</span>  <span class="kt" style="color: #458; font-weight: 600;">PlusO</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="38" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="39" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="40" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="41" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">B</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="42" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">Char</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="43" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">D</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">Float</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="44" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="45" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">U</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">d</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="46" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">U</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">U</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="47" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">d</span></span>

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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">U</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">d</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="n" style="color: #333;">f</span>  <span class="kt" style="color: #458; font-weight: 600;">A</span>  <span class="kt" style="color: #458; font-weight: 600;">A</span>  <span class="kt" style="color: #458; font-weight: 600;">A</span>  <span class="kt" style="color: #458; font-weight: 600;">A</span>  <span class="kt" style="color: #458; font-weight: 600;">U</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">d</span></span>

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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">h</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">U</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">d</span></span>

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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">U</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">h</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>

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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"><span class="n" style="color: #333;">g</span>  <span class="kt" style="color: #458; font-weight: 600;">A</span>  <span class="kt" style="color: #458; font-weight: 600;">A</span>  <span class="kt" style="color: #458; font-weight: 600;">A</span>  <span class="kt" style="color: #458; font-weight: 600;">A</span>  <span class="kt" style="color: #458; font-weight: 600;">A</span>  <span class="kt" style="color: #458; font-weight: 600;">A</span>  <span class="kt" style="color: #458; font-weight: 600;">A</span>  <span class="kt" style="color: #458; font-weight: 600;">A</span>  <span class="kt" style="color: #458; font-weight: 600;">U</span>  <span class="kt" style="color: #458; font-weight: 600;">U</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span></pre>

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<br>

</li>

<li id="3f008b1075a9766ad5e36cd1cc3e96231e729486">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d568ec5857a649953992006d5b8f3be58e15ba19#3f008b1075a9766ad5e36cd1cc3e96231e729486"><strong>testsuite/tests/pmcheck/should_compile/T18609.stderr</strong></a>

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1

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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18609.hs:36:25: warning: [-Woverlapping-patterns (in -Wdefault)]</span>

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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">    Pattern match has inaccessible right hand side</span>

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">    In an equation for ‘invZero’: invZero !_ !_ | False = ...</span>

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">T18609.hs:51:20: warning: [-Woverlapping-patterns (in -Wdefault)]</span>

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">    Pattern match has inaccessible right hand side</span>

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">    In an equation for ‘f’: f !_ !_ !_ !_ !_ | False = ...</span>

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">T18609.hs:59:35: warning: [-Woverlapping-patterns (in -Wdefault)]</span>

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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">    Pattern match has inaccessible right hand side</span>

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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">    In an equation for ‘g’:</span>

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">        g !_ !_ !_ !_ !_ !_ !_ !_ !_ !_ | False = ...</span></pre>

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<br>

</li>

<li id="a52966ece03f9e76a93a2c4ea96b9fb25368723d">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d568ec5857a649953992006d5b8f3be58e15ba19#a52966ece03f9e76a93a2c4ea96b9fb25368723d"><strong>testsuite/tests/pmcheck/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">@@ -150,6 +150,8 @@ test('T18533', normal, compile,</td>

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<pre style="margin: 0;"> <span id="LC150" class="line" lang="perl">     <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>

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<pre style="margin: 0;"> <span id="LC151" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18572</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>

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<pre style="margin: 0;"> <span id="LC152" class="line" lang="perl">     <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-incomplete-uni-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>

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<pre style="margin: 0;">+<span id="LC153" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18609</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>

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<pre style="margin: 0;">+<span id="LC154" class="line" lang="perl">     <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC155" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18670</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>

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<pre style="margin: 0;"> <span id="LC156" class="line" lang="perl">     <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>

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155

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<td class="diff-line-num new_line" data-linenumber="157" 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">

157

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC157" class="line" lang="perl"></span>

</pre>

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