[GHC] #12402: Add fromLeft and fromRight to Data.Either

[GHC]

#12402: Add fromLeft and fromRight to Data.Either
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        Reporter:  mettekou          |                Owner:
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  8.0.1
      Resolution:                    |             Keywords:  Data.Either,
                                     |  fromLeft, fromRight
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2403
       Wiki Page:                    |
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Changes (by mpickering):

 * differential:  D2403 => Phab:D2403


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12402#comment:3>
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