[GHC] #11767: Add @since annotations for base instances

[GHC]

#11767: Add @since annotations for base instances
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           Reporter:  bgamari        |             Owner:
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.2.1
          Component:  Core           |           Version:  7.10.3
  Libraries                          |
           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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 Up until now we haven't been adding `@since` annotations for instances
 that we add to `base` (see Phab:D2051 for the discussion that spurred this
 ticket). We should try to get better coverage here.

 Unfortunately, we currently have no way to place Haddock comments on
 derived instances, which limits our ability consistently add these
 annotations. We'll need to work out some mechanism for this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11767>
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