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

[GHC]

#4359: Implement lambda-case/lambda-if
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    Reporter:  batterseapower    |        Owner:              
        Type:  feature request   |       Status:  new         
    Priority:  normal            |    Milestone:              
   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 igloo):

 `\ of` is my favourite of the lambda-case syntaxes, although I still think
 mcase would provide more benefit (no reason we can't have both, though).

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4359#comment:12>
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