[GHC] #11768: Need a way to attach Haddock documentation to derived instances

[GHC]

#11768: Need a way to attach Haddock documentation to derived instances
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        Reporter:  bgamari           |                Owner:
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11767            |  Differential Rev(s):  Phab:D2175
       Wiki Page:                    |
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Comment (by bgamari):

 See [[https://github.com/haskell/haddock/pull/499/files|Haddock #499]] for
 the Haddock piece of this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11768#comment:4>
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