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

[GHC]

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

 * cc: black.meph@… (added)
  * version:  6.12.1 => 6.12.3


Comment:

 If you check the referenced hpaste, you'll see that it also occurs on
 Windows builds.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4220#comment:2>
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