[GHC] #14767: Move Data.Functor.Contravariant into base

[GHC]

#14767: Move Data.Functor.Contravariant into base
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           Reporter:  andrewthad     |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.2.2
           Keywords:  base           |  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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 I propose that `Data.Functor.Contravariant` be moved to `base`. This has
 been discussed on the mailing list in 2016 and 2017:

 - https://mail.haskell.org/pipermail/libraries/2016-December/027480.html
 - https://mail.haskell.org/pipermail/libraries/2017-September/028190.html

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14767>
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