[GHC] #1168: Optimisation sometimes decreases sharing in IO code

[GHC]

#1168: Optimisation sometimes decreases sharing in IO code
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    Reporter:  simonmar          |       Owner:                         
        Type:  bug               |      Status:  new                    
    Priority:  normal            |   Milestone:  _|_                    
   Component:  Compiler          |     Version:  6.6                    
    Keywords:                    |          Os:  Unknown/Multiple       
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown           
  Difficulty:  Unknown           |    Testcase:  nofib/spectral/calendar
   Blockedby:                    |    Blocking:                         
     Related:                    |  
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Comment(by simonpj):

 See also #7561 for another example.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1168#comment:14>
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