[GHC] #12938: Polykinded associated type family rejected on false pretenses

[GHC]

#12938: Polykinded associated type family rejected on false pretenses
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        Reporter:  goldfire          |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 This is fixed now. Adding a regression test.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12938#comment:2>
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