[GHC] #917: -O introduces space leak

[GHC]

#917: -O introduces space leak
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    Reporter:  claus.reinke@…           |        Owner:              
        Type:  bug                      |       Status:  new         
    Priority:  lowest                   |    Milestone:  _|_         
   Component:  Compiler                 |      Version:  6.5         
    Keywords:                           |     Testcase:              
   Blockedby:                           |   Difficulty:  Unknown     
          Os:  Unknown/Multiple         |     Blocking:              
Architecture:  Unknown/Multiple         |      Failure:  None/Unknown
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Comment(by igloo):

 Another example: #4276.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/917#comment:7>
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