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<h3>
Sebastian Graf pushed to branch wip/T17977
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f024b6e385bd1448968b7bf20de05f655c815bae">f024b6e3</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-30T12:48:39+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expect T4267 to pass
Since 54250f2d8de910b094070c1b48f086030df634b1 we expected T4267 to
fail, but it passes on CI.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5734285808c549ebe505089b0cbf9afe7089e857">57342858</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-03-30T17:54:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Adjust recursion depth for nonVoid test
In #17977, we ran into the reduction depth limit of the typechecker.
That was only a symptom of a much broader issue: The recursion depth
of the coverage checker for trying to instantiate strict fields in the
`nonVoid` test was far too high (100, the `defaultMaxTcBound`).
As a result, we were performing quite poorly on `T17977`.
Short of a proper termination analysis to prove emptyness of a type,
we just default to a much lower recursion limit of 3.
Fixes #17977.
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<h4>6 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
compiler/GHC/HsToCore/PmCheck/Oracle.hs
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<li class="file-stats">
<a href="#f41ec90131956922871428d1f65574b7c372b5af">
testsuite/tests/perf/should_run/all.T
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<li class="file-stats">
<a href="#663ab451580f16183c98da78f0b907b78cc04ad6">
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testsuite/tests/pmcheck/should_compile/T17977.hs
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<li class="file-stats">
<a href="#ec6535bd36d396fc3581c997cf5b85dcaa7c9b7e">
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testsuite/tests/pmcheck/should_compile/T17977b.hs
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<a href="#33807fd4b8ca5e4ac745a4d2f1cf105aa1d22e7f">
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testsuite/tests/pmcheck/should_compile/T17977b.stderr
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<li class="file-stats">
<a href="#a52966ece03f9e76a93a2c4ea96b9fb25368723d">
testsuite/tests/pmcheck/should_compile/all.T
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<h4>Changes:</h4>
<li id="8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a2226015e76fed5041aac59433c60e4379f8d73e...5734285808c549ebe505089b0cbf9afe7089e857#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564"><strong>compiler/GHC/HsToCore/PmCheck/Oracle.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1322" 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="diff-line-num unfold js-unfold new_line" data-linenumber="1322" 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">@@ -1322,7 +1322,7 @@ checkAllNonVoid rec_ts amb_cs strict_arg_tys = do</td>
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<td class="diff-line-num old_line" data-linenumber="1322" 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">
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<td class="diff-line-num new_line" data-linenumber="1322" 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">
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<pre style="margin: 0;"> <span id="LC1322" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rec_max_bound</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tys_to_check</span> <span class="p">`</span><span class="n" style="color: #333;">lengthExceeds</span><span class="p">`</span> <span class="mi" style="color: #099;">1</span></span>
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<td class="diff-line-num new_line" data-linenumber="1323" 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">
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<pre style="margin: 0;"> <span id="LC1323" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;"> <span id="LC1324" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">-<span id="LC1325" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">defaultRecTcMaxBound</span></span></span>
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<td class="diff-line-num new old_line" data-linenumber="1326" 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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<td class="diff-line-num new new_line" data-linenumber="1325" 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="LC1325" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;"><span class="idiff left right">3</span></span></span>
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<pre style="margin: 0;"> <span id="LC1326" class="line" lang="haskell"> <span class="n" style="color: #333;">rec_ts'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setRecTcMaxBound</span> <span class="n" style="color: #333;">rec_max_bound</span> <span class="n" style="color: #333;">rec_ts</span></span>
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<td class="diff-line-num old_line" data-linenumber="1327" 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">
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<pre style="margin: 0;"> <span id="LC1327" class="line" lang="haskell"> <span class="n" style="color: #333;">allM</span> <span class="p">(</span><span class="n" style="color: #333;">nonVoid</span> <span class="n" style="color: #333;">rec_ts'</span> <span class="n" style="color: #333;">amb_cs</span><span class="p">)</span> <span class="n" style="color: #333;">tys_to_check</span></span>
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<pre style="margin: 0;"> <span id="LC1328" class="line" lang="haskell"></span>
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<li id="f41ec90131956922871428d1f65574b7c372b5af">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a2226015e76fed5041aac59433c60e4379f8d73e...5734285808c549ebe505089b0cbf9afe7089e857#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">@@ -233,8 +233,7 @@ test('T5949',</td>
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<pre style="margin: 0;"> <span id="LC233" 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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<pre style="margin: 0;"> <span id="LC234" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T4267</span><span class="p">',</span></span>
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<pre style="margin: 0;">-<span id="LC236" class="line" lang="perl"> <span class="p">[</span><span class="nv" style="color: #008080;">expect_broken</span><span class="p">(</span><span class="mi" style="color: #099;">4267</span><span class="p">),</span></span>
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<pre style="margin: 0;">-<span id="LC237" class="line" lang="perl"> <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;">10</span><span class="p">),</span></span>
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<pre style="margin: 0;">+<span id="LC236" 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;">10</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC237" class="line" lang="perl"> <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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<pre style="margin: 0;"> <span id="LC238" class="line" lang="perl"> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC239" 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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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a2226015e76fed5041aac59433c60e4379f8d73e...5734285808c549ebe505089b0cbf9afe7089e857#663ab451580f16183c98da78f0b907b78cc04ad6"><strong>testsuite/tests/pmcheck/should_compile/T17977.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;">{-# LANGUAGE DataKinds #-}</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;">{-# LANGUAGE GADTs #-}</span></span>
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3
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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 ScopedTypeVariables #-}</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies #-}</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeOperators #-}</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UndecidableInstances #-}</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" 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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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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9
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<pre style="margin: 0;">+<span id="LC9" 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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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Type.Equality</span></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</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;">Nat</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SNat</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</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="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SZ</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SNat</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SNat</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;">SNat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">S'</span> <span class="p">(</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;">Nat</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="kr" style="font-weight: 600;">where</span></span>
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19
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">S'</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;">S</span> <span class="n" style="color: #333;">n</span></span>
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20
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"></span>
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21
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">R</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nat</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="LC22" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkR</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;">R</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">o</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">R</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">o</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">NatPlus</span> <span class="p">(</span><span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span><span class="p">)</span> <span class="p">(</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;">Nat</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NatPlus</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NatPlus</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">m</span><span class="p">)</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;">S'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NatPlus</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC28" 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;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span><span class="p">)</span> <span class="p">(</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;">Nat</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">o</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SNat</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SNat</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;">SNat</span> <span class="n" style="color: #333;">o</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">R</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">o</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NatPlus</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">:~:</span> <span class="n" style="color: #333;">o</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SS</span> <span class="n" style="color: #333;">sm</span><span class="p">)</span> <span class="n" style="color: #333;">sn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SS</span> <span class="n" style="color: #333;">so</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkR</span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Refl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">sm</span> <span class="n" style="color: #333;">sn</span> <span class="n" style="color: #333;">so</span> <span class="n" style="color: #333;">r</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Refl</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a2226015e76fed5041aac59433c60e4379f8d73e...5734285808c549ebe505089b0cbf9afe7089e857#ec6535bd36d396fc3581c997cf5b85dcaa7c9b7e"><strong>testsuite/tests/pmcheck/should_compile/T17977b.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;">{-# LANGUAGE DataKinds #-}</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;">{-# LANGUAGE GADTs #-}</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 KindSignatures #-}</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;">{-# LANGUAGE EmptyCase #-}</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;">Bug</span> <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>
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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;">Nat</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;">Nat</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;">Down</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</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;">Down</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;">Down</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Down</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Up</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</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="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Up</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;">Up</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">n</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Up</span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC17" 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;">Down</span> <span class="n" style="color: #333;">n</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="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Down</span> <span class="n" style="color: #333;">r</span><span class="p">)</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="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC20" 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;">Down</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</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>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">f'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Down</span> <span class="n" style="color: #333;">r</span><span class="p">)</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="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC23" 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;">Up</span> <span class="n" style="color: #333;">n</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="LC24" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Up</span> <span class="n" style="color: #333;">r</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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<li id="33807fd4b8ca5e4ac745a4d2f1cf105aa1d22e7f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a2226015e76fed5041aac59433c60e4379f8d73e...5734285808c549ebe505089b0cbf9afe7089e857#33807fd4b8ca5e4ac745a4d2f1cf105aa1d22e7f"><strong>testsuite/tests/pmcheck/should_compile/T17977b.stderr</strong></a>
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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">T17977b.hs:21:1: 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 ‘f'’: f' (Down r) = ...</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a2226015e76fed5041aac59433c60e4379f8d73e...5734285808c549ebe505089b0cbf9afe7089e857#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">@@ -114,6 +114,10 @@ test('T17703', normal, compile,</td>
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<pre style="margin: 0;"> <span id="LC114" 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="LC115" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17783</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="LC116" 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="LC117" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17977</span><span class="p">',</span> <span class="nv" style="color: #008080;">collect_compiler_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;">10</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="LC118" 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="LC119" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17977b</span><span class="p">',</span> <span class="nv" style="color: #008080;">collect_compiler_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;">10</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="LC120" 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="LC121" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># Other tests</span></span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">pmc001</span><span class="p">',</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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