[GHC] #2237: qualified names not permitted everywhere in instances

[GHC]

#2237: qualified names not permitted everywhere in instances
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    Reporter:  claus    |       Owner:                   
        Type:  bug      |      Status:  new              
    Priority:  normal   |   Component:  Compiler (Parser)
     Version:  6.9      |    Severity:  normal           
    Keywords:           |    Testcase:                   
Architecture:  Unknown  |          Os:  Unknown          
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 consider using a class that is imported qualified only:

  - we cannot define instance methods, as their qualified names are not
 accepted (this restriction makes sense at top-level, but not in instances)

  - we cannot refer to instances in instance contexts, as their qualified
 names are not accepted (they are accepted in class contexts, and
 -XFlexibleInstances accepts them in instance contexts)

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2237>
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