[GHC] #8758: GeneralizedNewtypeDeriving sometimes needs RankNTypes

[GHC]

#8758: GeneralizedNewtypeDeriving sometimes needs RankNTypes
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        Reporter:  goldfire                      |            Owner:
            Type:  bug                           |  goldfire
        Priority:  normal                        |           Status:  merge
       Component:  Compiler (Type checker)       |        Milestone:  7.8.1
      Resolution:                                |          Version:
Operating System:  Unknown/Multiple              |  7.8.1-rc1
 Type of failure:  None/Unknown                  |         Keywords:
       Test Case:                                |     Architecture:
  deriving/should_compile/T8758                  |  Unknown/Multiple
        Blocking:                                |       Difficulty:
                                                 |  Unknown
                                                 |       Blocked By:
                                                 |  Related Tickets:
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Changes (by thoughtpolice):

 * milestone:   => 7.8.1


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8758#comment:3>
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