[GHC] #5676: Typeclass instance function type declarations

[GHC]

#5676: Typeclass instance function type declarations
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    Reporter:  drb226                                        |        Owner:                           
        Type:  feature request                               |       Status:  new                      
    Priority:  normal                                        |    Milestone:                           
   Component:  Compiler (Type checker)                       |      Version:                           
    Keywords:  typeclass instance function type declaration  |     Testcase:                           
   Blockedby:                                                |   Difficulty:                           
          Os:  Unknown/Multiple                              |     Blocking:                           
Architecture:  Unknown/Multiple                              |      Failure:  GHC rejects valid program
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Comment(by simonpj):

 See also #5674, which proposes the same feature.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5676#comment:2>
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