[GHC] #12564: Type family in type pattern kind

[GHC]

#12564: Type family in type pattern kind
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        Reporter:  int-index         |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler (Type    |              Version:  8.0.1
  checker)                           |             Keywords:  TypeInType,
      Resolution:                    |  TypeFamilies
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by int-index):

 > In reality, probably not

 :(

 I'd love to see a fix for this in 8.2 - tell me if I can assist.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12564#comment:5>
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