[GHC] #9984: Show, Read, Eq, Ord instances for Control.Applicative.Const

[GHC]

#9984: Show, Read, Eq, Ord instances for Control.Applicative.Const
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        Reporter:  fumieval          |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  low               |               Milestone:
       Component:  libraries/base    |                 Version:  7.8.4
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by ekmett):

 We determined in response to a similar earlier ticket that such instances
 should just be added where they are obvious and can be added
 unambiguously, so I don't see any issue at all with adding these.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9984#comment:1>
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