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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/33f095511a8fce4c945bbcd4feb3910c854dcb61">33f09551</a></strong>
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<span>by Ryan Scott</span>
<i>at 2020-03-31T10:54:57-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #17963
The panic in #17963 happened to be fixed by commit
e3c374cc5bd7eb49649b9f507f9f7740697e3f70. This patch adds a
regression test to ensure that it remains fixed.
Fixes #17963.
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<h4>3 changed files:</h4>
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testsuite/tests/polykinds/T17963.hs
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testsuite/tests/polykinds/T17963.stderr
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testsuite/tests/polykinds/all.T
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<h4>Changes:</h4>
<li id="4d75170e9c3d67724c464595678c3115e7458854">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/33f095511a8fce4c945bbcd4feb3910c854dcb61#4d75170e9c3d67724c464595678c3115e7458854"><strong>testsuite/tests/polykinds/T17963.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 PolyKinds #-}</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 RankNTypes #-}</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 StandaloneKindSignatures #-}</span></span>
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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 TypeApplications #-}</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T17963</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Constraint</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RuntimeRep</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Cat</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;">rep</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RuntimeRep</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Cat</span> <span class="n" style="color: #333;">ob</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ob</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ob</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Category'</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">rep</span> <span class="p">(</span><span class="n" style="color: #333;">ob</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="n" style="color: #333;">rep</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Cat</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">ob</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Constraint</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Category'</span> <span class="p">(</span><span class="n" style="color: #333;">cat</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Cat</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">ob</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="n" style="color: #333;">id'</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">cat</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">a</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/33f095511a8fce4c945bbcd4feb3910c854dcb61#bb0e4d1fc03add94aebb4554cd8f2311418df792"><strong>testsuite/tests/polykinds/T17963.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T17963.hs:15:23: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match a lifted type with an unlifted type</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> ‘rep1’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> the class declaration for ‘Category'’</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> at T17963.hs:13:27-29</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> When matching kinds</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> k0 :: *</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> ob :: TYPE rep1</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> Expected kind ‘ob’, but ‘a’ has kind ‘k0’</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> • In the first argument of ‘cat’, namely ‘a’</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> In the type signature: id' :: forall a. cat a a</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> In the class declaration for ‘Category'’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/33f095511a8fce4c945bbcd4feb3910c854dcb61#37bb83d0a916288b2296ba25cdbbef228eed6484"><strong>testsuite/tests/polykinds/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">@@ -216,3 +216,4 @@ test('T16263', normal, compile_fail, [''])</td>
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16902</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">CuskFam</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17841</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17963</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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