[GHC] #7642: Nullary type classes

[GHC]

#7642: Nullary type classes
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    Reporter:  shachaf                  |       Owner:                  
        Type:  feature request          |      Status:  new             
    Priority:  normal                   |   Milestone:                  
   Component:  Compiler (Type checker)  |     Version:  7.6.1           
    Keywords:                           |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple         |     Failure:  None/Unknown    
  Difficulty:  Unknown                  |    Testcase:                  
   Blockedby:                           |    Blocking:                  
     Related:                           |  
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Comment(by simonpj):

 Do implicit parameters not serve this purpose rather well?

 Simon

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7642#comment:5>
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