[GHC] #4028: Derived Data instance requires Data instances for unused type parameters

[GHC]

#4028: Derived Data instance requires Data instances for unused type parameters
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    Reporter:  igloo                    |        Owner:              
        Type:  bug                      |       Status:  new         
    Priority:  normal                   |    Milestone:  6.14.1      
   Component:  Compiler (Type checker)  |      Version:  6.12.2      
    Keywords:                           |   Difficulty:              
          Os:  Unknown/Multiple         |     Testcase:              
Architecture:  Unknown/Multiple         |      Failure:  None/Unknown
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Changes (by fons):

 * cc: alfonso.acosta@… (added)


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4028#comment:1>
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