[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):

 Replying to [comment:50 simonpj]:
 > Concerning (1) I don't understand. If you don't put a curly brace,
 everything would happen just like now... so `mask` would be fine.
 Yes. I was referring to the syntax implemented in the patch.

 > Does anyone else have other ''concrete'' proposals?  If so, let's hear
 them.
 Let me bug you one last time. Please consider adding \case expressions
 ''in addition'' to multi-clause lambdas. Сase expressions are at the
 fingertips of every haskeller, not having their "anonymous" version will
 (and in my case already is) lead to constant stumbling (due to different
 pattern syntax). Besides, we already have that sort of duplication for
 one-argument named functions ({{{fun P = ...}}} vs {{{fun x = case x of P
 -> ...}}}).

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4359#comment:51>
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