[GHC] #3964: Impossible happened when using ViewPattern in Arrows (was: Impossible happened)

[GHC]

#3964: Impossible happened when using ViewPattern in Arrows
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    Reporter:  uzytkownik      |       Owner:                    
        Type:  bug             |      Status:  new               
    Priority:  normal          |   Component:  Compiler          
     Version:  6.12.1          |    Keywords:                    
          Os:  Linux           |    Testcase:                    
Architecture:  x86_64 (amd64)  |     Failure:  Compile-time crash
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Comment(by uzytkownik):

 If I change the ViewPattern into if the problem does not occure.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3964#comment:2>
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