[GHC] #3961: -O results in incorrect behavior on Mac OS X

[GHC]

#3961: -O results in incorrect behavior on Mac OS X
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    Reporter:  RichardG  |       Owner:                             
        Type:  bug       |      Status:  new                        
    Priority:  normal    |   Component:  Compiler                   
     Version:  6.12.1    |    Keywords:                             
          Os:  MacOS X   |    Testcase:                             
Architecture:  x86       |     Failure:  Incorrect result at runtime
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Comment(by RichardG):

 Ticket #3983 may be related.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3961#comment:4>
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