[GHC] #5481: Associated type defaults + MultiParamTypeClasses error

[GHC]

#5481: Associated type defaults + MultiParamTypeClasses error
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    Reporter:  illissius         |       Owner:                           
        Type:  bug               |      Status:  new                      
    Priority:  normal            |   Component:  Compiler                 
     Version:  7.3               |    Keywords:                           
    Testcase:                    |   Blockedby:                           
          Os:  Unknown/Multiple  |    Blocking:                           
Architecture:  Unknown/Multiple  |     Failure:  GHC rejects valid program
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Comment(by batterseapower):

 Oops. The consistent instantiation check was totally broken. Validating a
 fix now.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5481#comment:1>
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