[GHC] #8758: GeneralizedNewtypeDeriving sometimes needs RankNTypes

[GHC]

#8758: GeneralizedNewtypeDeriving sometimes needs RankNTypes
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        Reporter:  goldfire                 |            Owner:  goldfire
            Type:  bug                      |           Status:  new
        Priority:  normal                   |        Milestone:
       Component:  Compiler (Type checker)  |          Version:  7.8.1-rc1
      Resolution:                           |         Keywords:
Operating System:  Unknown/Multiple         |     Architecture:
 Type of failure:  None/Unknown             |  Unknown/Multiple
       Test Case:                           |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:
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Comment (by Richard Eisenberg <eir@…>):

 In [changeset:"8cc398ff8b3f7408327d99347f440693cb204c0a/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="8cc398ff8b3f7408327d99347f440693cb204c0a"
 Fix #8758 by assuming RankNTypes when checking GND code.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8758#comment:1>
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