[GHC] #4220: EmptyDataDecls + DeriveFunctor == Panic!

[GHC]

#4220: EmptyDataDecls + DeriveFunctor == Panic!
---------------------------------+------------------------------------------
    Reporter:  conal             |        Owner:  simonpj           
        Type:  bug               |       Status:  new               
    Priority:  normal            |    Milestone:  6.14.1            
   Component:  Compiler          |      Version:  6.12.3            
    Keywords:                    |     Testcase:                    
   Blockedby:                    |   Difficulty:                    
          Os:  Unknown/Multiple  |     Blocking:                    
Architecture:  Unknown/Multiple  |      Failure:  Compile-time crash
---------------------------------+------------------------------------------
Changes (by igloo):

  * owner:  => simonpj
  * milestone:  => 6.14.1


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4220#comment:6>
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