[GHC] #7175: Panic when wrongly using a type family as return types for GADTs

[GHC]

#7175: Panic when wrongly using a type family as return types for GADTs
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    Reporter:  goldfire          |       Owner:                             
        Type:  bug               |      Status:  merge                      
    Priority:  normal            |   Milestone:                             
   Component:  Compiler          |     Version:  7.6.1-rc1                  
    Keywords:                    |          Os:  Unknown/Multiple           
Architecture:  Unknown/Multiple  |     Failure:  Compile-time crash         
  Difficulty:  Unknown           |    Testcase:  typecheck/should_fail/T7175
   Blockedby:                    |    Blocking:                             
     Related:                    |  
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Changes (by simonpj):

  * status:  new => merge
  * difficulty:  => Unknown
  * testcase:  => typecheck/should_fail/T7175


Comment:

 Thanks!  Fixed.  Pls merge to 7.6

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7175#comment:2>
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