[GHC] #9633: PolyKinds in 7.8.2 vs 7.8.3

[GHC]

#9633: PolyKinds in 7.8.2 vs 7.8.3
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              Reporter:  crockeea    |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:  PolyKinds
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  GHC         |       Blocked By:
  rejects valid program              |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by goldfire):

 I looked a little at this, and `Control.Monad.Primitive` isn't integral to
 the problem. Just replace `PrimMonad` with `Monad` and use a fresh type
 family for `PrimState`. Didn't figure out much beyond that, but I only
 tried for 5 minutes.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9633#comment:3>
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