[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):

 Replying to [comment:2 malcolm.wallace@…]:
 > I would disagree that monadic bindings are the only (or even a major)
 use case.

 By "The motivating examples" I meant "The motivating examples in the
 thread linked to".

 > Personally, I would often like the ability to have a standard lambda
 that can discriminate patterns on the value being bound.

 Do you have any realworld examples, OOI?

 From a style point of view, using it point-free, as in your example, I
 think looks OK, but if it was being applied to something non-trivial (or
 even being composed with something non-trivial) I think it would be
 clearer if written using a let-bound function.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4359#comment:5>
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