[GHC] #14029: Implement the "Add <&> to Data.Functor" proposal

[GHC]

#14029: Implement the "Add <&> to Data.Functor" proposal
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                Owner:  supersven
            Type:  task              |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  8.0.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3800
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"9cfabbb5267e72b8017d8dc04d8580f73f425aa8/ghc" 9cfabbb/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="9cfabbb5267e72b8017d8dc04d8580f73f425aa8"
 Add '<&>' operator to Data.Functor. '<&>' calls '<$>' with flipped
 arguments.

 This was proposed by David Feuer
 (https://mail.haskell.org/pipermail/libraries/2016-August/027293.html)
 and solves #14029.

 The implementation is a copy of the '<&>' operator in Control.Lens.Lens.

 Add tests for following Data.Functor operators: '<$>', '<&>', '<$' and
 '$>'.

 '<&>' was added for solving #14029. '<$>', '<$' and '$>' were probably
 untested.

 Reviewers: austin, hvr, bgamari, RyanGlScott

 Reviewed By: RyanGlScott

 Subscribers: RyanGlScott, rwbarton, thomie

 Differential Revision: https://phabricator.haskell.org/D3800
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14029#comment:6>
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