[GHC] #4359: Implement lambda-case/lambda-if

[GHC]

#4359: Implement lambda-case/lambda-if
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    Reporter:  batterseapower    |        Owner:  igloo       
        Type:  feature request   |       Status:  patch       
    Priority:  high              |    Milestone:  7.4.1       
   Component:  Compiler          |      Version:  7.1         
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by mikhail.vorozhtsov):

 We could use "\" + "map" as the starting lexemes. It is uncommon to name
 an argument "map" due to the overshadowing warning. Of course, in all
 other contexts "map" would be just an identifier.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4359#comment:53>
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