[GHC] #9664: Add identity functor to base

[GHC]

#9664: Add identity functor to base
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              Reporter:  hvr         |            Owner:  ekmett
                  Type:  task        |           Status:  new
              Priority:  normal      |        Milestone:  7.10.1
             Component:  Core        |          Version:
  Libraries                          |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Easy (less than 1
  Unknown/Multiple                   |  hour)
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by hvr):

 Replying to [comment:1 ross]:
 > I suggest doing a major release of transformers at the same time as the
 next major GHC release, with Data.Functor.Identity removed and added to
 base.  This version would depend on the new version of base to force an
 upgrade.

 Terrific!

 I'll draft a `transformers`-patch in our locally forked repo over at
 http://git.haskell.org/packages/transformers.git and migrate
 `Data.Functor.Identity` into GHC HEAD's `base` so we can start using that
 in GHC HEAD.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9664#comment:2>
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