[GHC] #5595: Unification under a forall doesn't allow full constraint solving (was: Type error: expected type = actual type ???)

[GHC]

#5595: Unification under a forall doesn't allow full constraint solving
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    Reporter:  basvandijk        |        Owner:                           
        Type:  bug               |       Status:  new                      
    Priority:  normal            |    Milestone:                           
   Component:  Compiler          |      Version:  7.2.1                    
    Keywords:                    |     Testcase:                           
   Blockedby:                    |   Difficulty:                           
          Os:  Unknown/Multiple  |     Blocking:                           
Architecture:  Unknown/Multiple  |      Failure:  GHC rejects valid program
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5595#comment:5>
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