[GHC] #7800: Error message when deriving Typeable without PolyKinds

[GHC]

#7800: Error message when deriving Typeable without PolyKinds
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        Reporter:  monoidal                      |            Owner:
            Type:  bug                           |  dreixel
        Priority:  normal                        |           Status:  new
       Component:  Compiler                      |        Milestone:  7.8.1
      Resolution:                                |          Version:  7.7
Operating System:  Unknown/Multiple              |         Keywords:
 Type of failure:  Incorrect warning at          |     Architecture:
  compile-time                                   |  Unknown/Multiple
       Test Case:                                |       Difficulty:
        Blocking:                                |  Unknown
                                                 |       Blocked By:
                                                 |  Related Tickets:
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Comment (by dreixel):

 Sorry, I forgot about this. And I won't have much time to look at it
 before ICFP. So yes, please do change the message; it's an improvement.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7800#comment:4>
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