[GHC] #10670: panic! ASSERT failed compiler/types/Type.hs line 1712

[GHC]

#10670: panic! ASSERT failed compiler/types/Type.hs line 1712
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        Reporter:  bjmprice          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Linux             |            Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash                              |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"5c3fc921aeeeec392a89914783b2be9ea3dade27/ghc"
 5c3fc921/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="5c3fc921aeeeec392a89914783b2be9ea3dade27"
 Fix Trac #10670

 In dataConCannotMatch we were using a GADT data con without
 properly instantiating the existential type variables.
 The fix is easy, and the code is tighter.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10670#comment:2>
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