[GHC] #5498: Generalized newtype deriving allows creating of instances I can't create by hand

[GHC]

#5498: Generalized newtype deriving allows creating of instances I can't create by
hand
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    Reporter:  dterei            |        Owner:              
        Type:  bug               |       Status:  new         
    Priority:  normal            |    Milestone:              
   Component:  Compiler          |      Version:  7.3         
    Keywords:                    |     Testcase:              
   Blockedby:  1496              |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
---------------------------------+------------------------------------------
Changes (by simonpj):

  * blockedby:  => 1496


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5498#comment:5>
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