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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Hmm. Yes, this is an (actually harmless) assertion failure if your build has -DDEBUG on. I think it’s just a fluke that it’s only just started failing.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">I’ll make a ticket for it; I don’t think it’s super-urgent.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Simon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> ghc-devs [mailto:ghc-devs-bounces@haskell.org]
<b>On Behalf Of </b>Simon Marlow<br>
<b>Sent:</b> 09 November 2016 13:03<br>
<b>To:</b> ghc-devs@haskell.org<br>
<b>Subject:</b> T12041 failing?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<pre><span style="color:black">I just saw the error below in a validate with -DDEBUG. Anyone know about this?<o:p></o:p></span></pre>
<pre style="word-wrap:break-word;white-space:pre-wrap"><span style="color:black">--- /tmp/ghctest-uhJ8rt/test spaces/./indexed-types/should_fail/T12041.run/T12041.stderr.normalised 2016-11-09 12:13:38.206501840 +0000<o:p></o:p></span></pre>
<pre><span style="color:black">+++ /tmp/ghctest-uhJ8rt/test spaces/./indexed-types/should_fail/T12041.run/T12041.comp.stderr.normalised 2016-11-09 12:13:38.206501840 +0000<o:p></o:p></span></pre>
<pre><span style="color:black">@@ -1,7 +1,17 @@<o:p></o:p></span></pre>
<pre><span style="color:black">+ghc: panic! (the 'impossible' happened)<o:p></o:p></span></pre>
<pre><span style="color:black">+ (GHC version 8.1.20161109 for x86_64-unknown-linux):<o:p></o:p></span></pre>
<pre><span style="color:black">+ ASSERT failed!<o:p></o:p></span></pre>
<pre><span style="color:black">+ i_axb<o:p></o:p></span></pre>
<pre><span style="color:black">+ Call stack:<o:p></o:p></span></pre>
<pre><span style="color:black">+ CallStack (from HasCallStack):<o:p></o:p></span></pre>
<pre><span style="color:black">+ prettyCurrentCallStack, called at compiler/utils/Outputable.hs:<line>:<column> in <package-id>:Outputable<o:p></o:p></span></pre>
<pre><span style="color:black">+ callStackDoc, called at compiler/utils/Outputable.hs:<line>:<column> in <package-id>:Outputable<o:p></o:p></span></pre>
<pre><span style="color:black">+ assertPprPanic, called at compiler/typecheck/TcType.hs:<line>:<column> in <package-id>:TcType<o:p></o:p></span></pre>
<pre><span style="color:black">+ Call stack:<o:p></o:p></span></pre>
<pre><span style="color:black">+ CallStack (from HasCallStack):<o:p></o:p></span></pre>
<pre><span style="color:black">+ prettyCurrentCallStack, called at compiler/utils/Outputable.hs:<line>:<column> in <package-id>:Outputable<o:p></o:p></span></pre>
<pre><span style="color:black">+ callStackDoc, called at compiler/utils/Outputable.hs:<line>:<column> in <package-id>:Outputable<o:p></o:p></span></pre>
<pre><span style="color:black">+ pprPanic, called at compiler/utils/Outputable.hs:<line>:<column> in <package-id>:Outputable<o:p></o:p></span></pre>
<pre><span style="color:black">+ assertPprPanic, called at compiler/typecheck/TcType.hs:<line>:<column> in <package-id>:TcType<o:p></o:p></span></pre>
<pre><span style="color:black"> <o:p></o:p></span></pre>
<pre><span style="color:black">-T12041.hs:12:15:<o:p></o:p></span></pre>
<pre><span style="color:black">- Expected kind ‘i -> Constraint’,<o:p></o:p></span></pre>
<pre><span style="color:black">- but ‘(~) Int’ has kind ‘* -> Constraint’<o:p></o:p></span></pre>
<pre><span style="color:black">- In the type ‘(~) Int’<o:p></o:p></span></pre>
<pre><span style="color:black">- In the type instance declaration for ‘Ob’<o:p></o:p></span></pre>
<pre><span style="color:black">- In the instance declaration for ‘Category I’<o:p></o:p></span></pre>
<pre><span style="color:black">+Please report this as a GHC bug: <a href="https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.haskell.org%2Fghc%2Freportabug&data=02%7C01%7Csimonpj%40microsoft.com%7C8af7a5deff5f49d2ab9808d408a0bd62%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636142933860965747&sdata=BUkCjhjy1GhK9SVcws2TAYIVD5FzdsYrXKciuyD6MzM%3D&reserved=0">http://www.haskell.org/ghc/reportabug</a><o:p></o:p></span></pre>
<pre><span style="color:black">*** unexpected failure for T12041(normal)<o:p></o:p></span></pre>
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