[GHC] #1600: Optimisation: CPR the results of IO

[GHC]

#1600: Optimisation: CPR the results of IO
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    Reporter:  simonmar          |        Owner:                  
        Type:  task              |       Status:  new             
    Priority:  normal            |    Milestone:  6.12 branch     
   Component:  Compiler          |      Version:  6.6.1           
    Severity:  normal            |   Resolution:                  
    Keywords:                    |   Difficulty:  Moderate (1 day)
    Testcase:                    |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |  
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Comment (by simonpj):

 See also #2387 and #2289

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1600#comment:4>
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