[GHC] #5939: Standalone deriving Generic on type with instantiated arguments

[GHC]

#5939: Standalone deriving Generic on type with instantiated arguments
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 Reporter:  dreixel           |          Owner:  dreixel         
     Type:  bug               |         Status:  new             
 Priority:  normal            |      Component:  Compiler        
  Version:  7.5               |       Keywords:                  
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
  Failure:  None/Unknown      |       Testcase:                  
Blockedby:                    |       Blocking:                  
  Related:                    |  
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Comment(by dreixel):

 Actually I now think we should reject these altogether, because I cannot
 see a reasonable use case for it (unless the datatype is a data family).
 If no one objects, I'll treat the current behaviour as a bug and add a
 check that will prevent deriving `Generic` on types with instantiated
 arguments.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5939#comment:2>
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