[GHC] #11171: the 'impossible' happened when messing with existenial quantification and typed holes

[GHC]

#11171: the 'impossible' happened when messing with existenial quantification and
typed holes
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        Reporter:  TheKing42         |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:  duplicate         |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10615            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 I fixed a bunch of wildcard-related stuff recently. So can you try with
 HEAD (or 8.0 when it comes) and say if you still think there's a problem?
 Thanks.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11171#comment:3>
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