[GHC] #10831: Document conditions on deriving Functor

[GHC]

#10831: Document conditions on deriving Functor
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        Reporter:  htebalaka         |                Owner:  RyanGlScott
            Type:  bug               |               Status:  merge
        Priority:  low               |            Milestone:  8.0.1
       Component:  Compiler (Type    |              Version:  7.10.2
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1293
       Wiki Page:                    |
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Changes (by thoughtpolice):

 * status:  new => merge
 * milestone:   => 8.0.1


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10831#comment:9>
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