[GHC] #3961: -O results in incorrect behavior

[GHC]

#3961: -O results in incorrect behavior
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    Reporter:  RichardG  |        Owner:  simonpj                    
        Type:  bug       |       Status:  infoneeded                 
    Priority:  high      |    Milestone:  7.0.1                      
   Component:  Compiler  |      Version:  6.12.1                     
    Keywords:            |     Testcase:                             
   Blockedby:  3959      |   Difficulty:                             
          Os:  MacOS X   |     Blocking:                             
Architecture:  x86       |      Failure:  Incorrect result at runtime
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Comment(by RichardG):

 Tested with HUnit 1.2.2.3 and GHC 7.0.0.20100924 on Mac OS X 10.6.4
 Server.  Issue was not reproduced.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3961#comment:12>
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