[GHC] #8516: Add (->) representation and the Invariant class to GHC.Generics

[GHC]

#8516: Add (->) representation and the Invariant class to GHC.Generics
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        Reporter:  nfrisby           |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  low               |        Milestone:
       Component:  Compiler (Type    |          Version:  7.7
  checker)                           |         Keywords:
      Resolution:                    |     Architecture:  Unknown/Multiple
Operating System:  Unknown/Multiple  |       Difficulty:  Moderate (less
 Type of failure:  None/Unknown      |  than a day)
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Changes (by simonpj):

 * cc: dreixel (added)


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8516#comment:1>
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