[GHC] #5129: "evaluate" optimized away

[GHC]

#5129: "evaluate" optimized away
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    Reporter:  dons              |        Owner:  simonmar                   
        Type:  bug               |       Status:  new                        
    Priority:  normal            |    Milestone:                             
   Component:  Compiler          |      Version:  7.0.3                      
    Keywords:  seq, evaluate     |     Testcase:                             
   Blockedby:                    |   Difficulty:                             
          Os:  Unknown/Multiple  |     Blocking:                             
Architecture:  Unknown/Multiple  |      Failure:  Incorrect result at runtime
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Comment(by ezyang):

 I would like to understand this tradeoff better. I would like to be able
 to say "use evaluate whenever the IO monad is available" but it seems you
 might preclude some optimizations with this advice.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5129#comment:11>
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