[GHC] #8565: New GeneralisedNewtypeDeriving needs help with higher rank types

[GHC]

#8565: New GeneralisedNewtypeDeriving needs help with higher rank types
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        Reporter:  simonpj                       |            Owner:
            Type:  bug                           |           Status:
        Priority:  normal                        |  closed
       Component:  Compiler                      |        Milestone:
      Resolution:  fixed                         |          Version:  7.6.3
Operating System:  Unknown/Multiple              |         Keywords:
 Type of failure:  None/Unknown                  |     Architecture:
       Test Case:                                |  Unknown/Multiple
  typecheck/should_compile/T8565                 |       Difficulty:
        Blocking:                                |  Unknown
                                                 |       Blocked By:
                                                 |  Related Tickets:
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Changes (by nomeata):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 After a day of refactoring I got it to work. The code will still need `{-#
 LANGUAGES ImpredicativeTypes #-}, but otherwise things work as expected.
 Pushing as we speak...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8565#comment:12>
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