[GHC] #4528: stand-alone deriving sometimes fails for GADTs

[GHC]

#4528: stand-alone deriving sometimes fails for GADTs
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    Reporter:  nestra                     |        Owner:                                                        
        Type:  bug                        |       Status:  merge                                                 
    Priority:  normal                     |    Milestone:  7.0.3                                                 
   Component:  Compiler (Type checker)    |      Version:  7.0.1                                                 
    Keywords:  deriving mechanism, GADTs  |     Testcase:  deriving/should_fail/T4528, deriving/should_run/T4528a
   Blockedby:                             |   Difficulty:                                                        
          Os:  Linux                      |     Blocking:                                                        
Architecture:  x86_64 (amd64)             |      Failure:  Compile-time performance bug                          
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Changes (by igloo):

  * milestone:  => 7.0.3


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4528#comment:3>
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