[GHC] #3927: Incomplete/overlapped pattern warnings + GADTs = inadequate

[GHC]

#3927: Incomplete/overlapped pattern warnings + GADTs = inadequate
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    Reporter:  simonpj           |       Owner:  simonpj         
        Type:  bug               |      Status:  new             
    Priority:  high              |   Milestone:  7.6.2           
   Component:  Compiler          |     Version:  6.12.1          
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:  #4139             |  
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Comment(by simonpj):

 See also #7294

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3927#comment:26>
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