[GHC] #8970: Non-exhaustive pattern match warning with DataKinds and TypeFamilies

[GHC]

#8970: Non-exhaustive pattern match warning with DataKinds and TypeFamilies
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        Reporter:  tensor5                       |            Owner:
            Type:  bug                           |           Status:  new
        Priority:  normal                        |        Milestone:
       Component:  Compiler                      |          Version:  7.6.3
      Resolution:                                |         Keywords:
Operating System:  Unknown/Multiple              |     Architecture:
 Type of failure:  Incorrect warning at          |  Unknown/Multiple
  compile-time                                   |       Difficulty:
       Test Case:                                |  Unknown
        Blocking:                                |       Blocked By:
                                                 |  Related Tickets:
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Comment (by simonpj):

 Yes, I think this is a long-outstanding bug, awaiting someone with some
 time and attention.  See #6124 for example.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8970#comment:2>
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