[GHC] #10524: PolyKinds doesn't interact well with DeriveFunctor

[GHC]

#10524: PolyKinds doesn't interact well with DeriveFunctor
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        Reporter:  RyanGlScott       |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10561            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Yes, but test `deriving/should_compile/T10561` still fails:
 {{{
 newtype Compose f g a = Compose (f (g a)) deriving Functor
 }}}
 (with `-XPolyKinds`) produces
 {{{
 T10561.hs:10:52: error:
     • Couldn't match kind ‘k’ with ‘*’
         arising from the first field of ‘Compose’ (type ‘f (g a)’)
     • When deriving the instance for (Functor (Compose f g))
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10524#comment:15>
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