[GHC] #7642: Nullary type classes

[GHC]

#7642: Nullary type classes
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    Reporter:  shachaf                  |       Owner:                  
        Type:  feature request          |      Status:  patch           
    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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Changes (by monoidal):

  * status:  new => patch


Comment:

 Patches attached. I could not directly use shachaf's detabbing patch, git
 gave me error about trailing whitespace.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7642#comment:8>
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