[GHC] #9205: Deriving Typeable for poly-kinded data family gives confusing error message

[GHC]

#9205: Deriving Typeable for poly-kinded data family gives confusing error message
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        Reporter:  dfranke           |            Owner:
            Type:  bug               |           Status:  closed
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.8.2
      Resolution:  fixed             |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonpj):

 Yes, that's what we want. I was just clarifying what "fixed" meant; you
 could have meant "rejected with a better error message".

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9205#comment:4>
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