T12041 failing?

[Simon Peyton Jones]

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.

I’ll make a ticket for it; I don’t think it’s super-urgent.

Simon

From: ghc-devs [mailto:ghc-devs-bounces at haskell.org] On Behalf Of Simon Marlow
Sent: 09 November 2016 13:03
To: ghc-devs at haskell.org
Subject: T12041 failing?


I just saw the error below in a validate with -DDEBUG.  Anyone know about this?

--- /tmp/ghctest-uhJ8rt/test   spaces/./indexed-types/should_fail/T12041.run/T12041.stderr.normalised       2016-11-09 12:13:38.206501840 +0000

+++ /tmp/ghctest-uhJ8rt/test   spaces/./indexed-types/should_fail/T12041.run/T12041.comp.stderr.normalised  2016-11-09 12:13:38.206501840 +0000

@@ -1,7 +1,17 @@

+ghc: panic! (the 'impossible' happened)

+  (GHC version 8.1.20161109 for x86_64-unknown-linux):

+      ASSERT failed!

+  i_axb

+  Call stack:

+      CallStack (from HasCallStack):

+        prettyCurrentCallStack, called at compiler/utils/Outputable.hs:<line>:<column> in <package-id>:Outputable

+        callStackDoc, called at compiler/utils/Outputable.hs:<line>:<column> in <package-id>:Outputable

+        assertPprPanic, called at compiler/typecheck/TcType.hs:<line>:<column> in <package-id>:TcType

+  Call stack:

+      CallStack (from HasCallStack):

+        prettyCurrentCallStack, called at compiler/utils/Outputable.hs:<line>:<column> in <package-id>:Outputable

+        callStackDoc, called at compiler/utils/Outputable.hs:<line>:<column> in <package-id>:Outputable

+        pprPanic, called at compiler/utils/Outputable.hs:<line>:<column> in <package-id>:Outputable

+        assertPprPanic, called at compiler/typecheck/TcType.hs:<line>:<column> in <package-id>:TcType



-T12041.hs:12:15:

-     Expected kind ‘i -> Constraint’,

-        but ‘(~) Int’ has kind ‘* -> Constraint’

-     In the type ‘(~) Int’

-      In the type instance declaration for ‘Ob’

-      In the instance declaration for ‘Category I’

+Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug<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>

*** unexpected failure for T12041(normal)
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