[GHC] #12399: DeriveFunctor fail

[GHC]

#12399: DeriveFunctor fail
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        Reporter:  osa1              |                Owner:
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  deriving/should_compile/T12399
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2404
       Wiki Page:                    |
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Changes (by simonpj):

 * testcase:   => deriving/should_compile/T12399


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12399#comment:6>
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