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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>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0bb02873eeeca41a64d26becb9057e988f444acd">0bb02873</a></strong>
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<span>by Sylvain Henry</span>
<i>at 2020-10-01T18:34:53-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for T18574
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e393f213f5ccff4fd6034d5294e51aa5a2720890">e393f213</a></strong>
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<span>by Sylvain Henry</span>
<i>at 2020-10-01T18:34:53-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow fusion with catMaybes (#18574)
Metric Decrease:
T18574
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<h4>5 changed files:</h4>
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<a href="#2df78cc55bab7804587e296d34ee8c8a7114fca0">
libraries/base/Data/Maybe.hs
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<a href="#392e9dfd3417e267d708c5ab16536f2994d43745">
libraries/base/changelog.md
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<a href="#bede4b8fb44eb57be3a75024ed1ac5807fc2370f">
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+
testsuite/tests/perf/should_run/T18574.hs
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testsuite/tests/perf/should_run/T18574.stdout
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<a href="#f41ec90131956922871428d1f65574b7c372b5af">
testsuite/tests/perf/should_run/all.T
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<h4>Changes:</h4>
<li id="2df78cc55bab7804587e296d34ee8c8a7114fca0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5c32655fffd0d8862f3ba693351f1e612daa0b6b...e393f213f5ccff4fd6034d5294e51aa5a2720890#2df78cc55bab7804587e296d34ee8c8a7114fca0"><strong>libraries/base/Data/Maybe.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">@@ -256,8 +256,8 @@ listToMaybe = foldr (const . Just) Nothing</td>
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<pre style="margin: 0;"> <span id="LC256" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- >>> catMaybes $ [readMaybe x :: Maybe Int | x <- ["1", "Foo", "3"] ]</span></span>
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [1,3]</span></span>
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<pre style="margin: 0;"> <span id="LC258" 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="LC259" class="line" lang="haskell"><span class="n" style="color: #333;">catMaybes</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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260
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<pre style="margin: 0;">-<span id="LC260" class="line" lang="haskell"><span class="n" style="color: #333;">catMaybes</span> <span class="n" style="color: #333;"><span class="idiff left">ls</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">|</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Just</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</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">ls</span></span><span class="p"><span class="idiff right">]</span></span></span>
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<pre style="margin: 0;">+<span id="LC259" class="line" lang="haskell"><span class="n" style="color: #333;">catMaybes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC260" class="line" lang="haskell"><span class="n" style="color: #333;">catMaybes</span> <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">mapMaybe</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">id</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- use mapMaybe to allow fusion (#18574)</span></span></span>
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC262" class="line" lang="haskell"><span class="cd">-- | The 'mapMaybe' function is a version of 'map' which can throw</span></span>
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<pre style="margin: 0;"> <span id="LC263" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- out elements. In particular, the functional argument returns</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5c32655fffd0d8862f3ba693351f1e612daa0b6b...e393f213f5ccff4fd6034d5294e51aa5a2720890#392e9dfd3417e267d708c5ab16536f2994d43745"><strong>libraries/base/changelog.md</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">@@ -32,6 +32,9 @@</td>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="markdown"><span class="p"> *</span> Add <span class="sb" style="color: #d14;">`MonadFix`</span> and <span class="sb" style="color: #d14;">`MonadZip`</span> instances for <span class="sb" style="color: #d14;">`Complex`</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="markdown"><span class="p"> *</span> Add <span class="sb" style="color: #d14;">`Ix`</span> instances for tuples of size 6 through 15</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="markdown"><span class="p"> *</span> <span class="sb" style="color: #d14;">`catMaybes`</span> is now implemented using <span class="sb" style="color: #d14;">`mapMaybe`</span>, so that it is both a "good</span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="markdown"> consumer" and "good producer" for list-fusion (#18574)</span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="markdown"> </span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## 4.14.0.0 *TBA*</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="markdown"><span class="p"> *</span> Bundled with GHC 8.10.1</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5c32655fffd0d8862f3ba693351f1e612daa0b6b...e393f213f5ccff4fd6034d5294e51aa5a2720890#bede4b8fb44eb57be3a75024ed1ac5807fc2370f"><strong>testsuite/tests/perf/should_run/T18574.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;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span></span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="n" style="color: #333;">main</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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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">print</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">even</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">sum</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">catMaybes</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">xx</span> <span class="p">([</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">..</span><span class="mi" style="color: #099;">100000000</span><span class="p">]</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">])</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="n" style="color: #333;">xx</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">even</span> <span class="n" style="color: #333;">n</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;">n</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5c32655fffd0d8862f3ba693351f1e612daa0b6b...e393f213f5ccff4fd6034d5294e51aa5a2720890#ed56218c898f280142f217e6abd2fd6bb6624134"><strong>testsuite/tests/perf/should_run/T18574.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">True</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5c32655fffd0d8862f3ba693351f1e612daa0b6b...e393f213f5ccff4fd6034d5294e51aa5a2720890#f41ec90131956922871428d1f65574b7c372b5af"><strong>testsuite/tests/perf/should_run/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">@@ -379,3 +379,9 @@ test('UniqLoop',</td>
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379
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379
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<pre style="margin: 0;"> <span id="LC379" class="line" lang="perl"> <span class="p">],</span></span>
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380
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380
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<pre style="margin: 0;"> <span id="LC380" class="line" lang="perl"> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span></span>
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381
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381
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<pre style="margin: 0;"> <span id="LC381" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-O -package ghc</span><span class="p">'])</span></span>
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382
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="perl"></span>
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383
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18574</span><span class="p">',</span></span>
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384
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="perl"> <span class="p">[</span><span class="nv" style="color: #008080;">collect_stats</span><span class="p">('</span><span class="s1" style="color: #d14;">bytes allocated</span><span class="p">',</span> <span class="mi" style="color: #099;">5</span><span class="p">),</span> <span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">normal</span><span class="p">'])],</span></span>
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385
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="perl"> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span></span>
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386
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-O</span><span class="p">'])</span></span>
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387
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="perl"></span></pre>
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