[GHC] #10831: Document conditions on deriving Functor

[GHC]

#10831: Document conditions on deriving Functor
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        Reporter:  htebalaka         |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  low               |               Milestone:
       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 Revisions:
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Changes (by simonpj):

 * cc: RyanGlScott (added)


Comment:

 Ryan Scott made an implementation-oriented stab at documenting Functor,
 Foldable, Traversable here: [wiki:Commentary/Compiler/DeriveFunctor].  But
 I think we still lack a user-oriented specification, and such a thing
 would be tremendously welcome.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10831#comment:3>
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