[GHC] #11357: Regression when deriving Generic1 on poly-kinded data family

[GHC]

#11357: Regression when deriving Generic1 on poly-kinded data family
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        Reporter:  RyanGlScott       |                Owner:
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.11
  (CodeGen)                          |             Keywords:  Generics,
      Resolution:                    |  TypeInType, TypeFamilies
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  GHC rejects       |            Test Case:
  valid program                      |  deriving/should_compile/T11357
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 Replying to [comment:10 simonpj]:
 > So, is comment:9 a release blocker?

 I say "no". It seems to be triggered only when you're deriving `Generic1`
 for a datatype parameterized over mixed type and kind variables. This last
 bit is possible only with `-XTypeInType` and thus is not a regression.

 I'm frankly unsure (without more research) as to what the desired behavior
 should be here.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11357#comment:13>
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