[GHC] #5762: GHC gives incorrect warnings with simple applications of the view patterns extension

[GHC]

#5762: GHC gives incorrect warnings with simple applications of the view patterns
extension
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    Reporter:  jmg               |       Owner:                                   
        Type:  bug               |      Status:  new                              
    Priority:  normal            |   Milestone:  _|_                              
   Component:  Compiler          |     Version:  7.3                              
    Keywords:                    |          Os:  Unknown/Multiple                 
Architecture:  Unknown/Multiple  |     Failure:  Incorrect warning at compile-time
  Difficulty:  Unknown           |    Testcase:                                   
   Blockedby:                    |    Blocking:                                   
     Related:                    |  
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Changes (by simonpj):

  * difficulty:  => Unknown
  * milestone:  => _|_


Comment:

 Not easy to solve this; cf #595, #5728, #3927, #5724.  Volunteers welcome.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5762#comment:1>
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