[GHC] #10586: GHC 7.10.1 panic due to wildcard in data family instance

[GHC]

#10586: GHC 7.10.1 panic due to wildcard in data family instance
-------------------------------------+-------------------------------------
        Reporter:  WrenThornton      |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:  #3699             |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by goldfire):

 * related:   => #3699


Comment:

 Allowing underscores there would be nice. See ticket #3699. But we surely
 shouldn't panic here.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10586#comment:1>
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