[GHC] #12088: Type/data family instances in kind checking

[GHC]

#12088: Type/data family instances in kind checking
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        Reporter:  alexvieth         |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.4.1
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11348, #12239    |  Differential Rev(s):  Phab:D2272
       Wiki Page:                    |
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Comment (by simonpj):

 Smaller example
 {{{
 type family Open a

 type instance Open Int = Bool


 type family F a :: Open a

 type instance F Int = True
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12088#comment:35>
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