[GHC] #10204: Odd interaction between rank-2 types and type families

[GHC]

#10204: Odd interaction between rank-2 types and type families
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        Reporter:  diatchki          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler (Type    |                 Version:  7.10.1
  checker)                           |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  GHC rejects       |               Test Case:
  valid program                      |                Blocking:
      Blocked By:                    |  Differential Revisions:
 Related Tickets:                    |
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Comment (by goldfire):

 Just to note: this is not a regression for 7.10. The identical behavior
 appears in 7.8.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10204#comment:1>
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