[GHC] #4463: CORE notes break optimisation

[GHC]

#4463: CORE notes break optimisation
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    Reporter:  rl                |        Owner:                         
        Type:  bug               |       Status:  new                    
    Priority:  normal            |    Milestone:                         
   Component:  Compiler          |      Version:  7.1                    
    Keywords:                    |     Testcase:                         
   Blockedby:                    |   Difficulty:                         
          Os:  Unknown/Multiple  |     Blocking:                         
Architecture:  Unknown/Multiple  |      Failure:  Runtime performance bug
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Comment(by simonpj):

 I didn't konw anyone was using core notes.  Are you using them in DPH?
 Why?  Depending on their semantics the above "move the seq" might or might
 not be correct.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4463#comment:1>
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