[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        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:  8.2.1
          Component:  Compiler       |           Version:  7.10.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 In the case of `base` we'd like to be able to attach Haddock `@since`
 annotations on new typeclass instances. Unfortunately many instances are
 derived, which we can't currently attach Haddock documentation to. Fix
 this.

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