GHC panics while trying to derive Generic for GADT with kind-lifted phantom parameter

This may be a duplicate of #5884 (closed)

Compiling the attached file gives the following crash:

ghc: panic! (the 'impossible' happened)
  (GHC version 7.4.1 for i386-apple-darwin):
        tcTyVarDetails ( tag{tv ae8} [tv] :: main:Main.ExprTag{tc rdD} )

Trac metadata

Trac field	Value
Version	7.4.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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