[GHC] #917: -O introduces space leak

[GHC]

#917: -O introduces space leak
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  Reporter:  claus.reinke at talk21.com  |          Owner:         
      Type:  bug                      |         Status:  new    
  Priority:  normal                   |      Milestone:         
 Component:  Compiler                 |        Version:  6.5    
  Severity:  normal                   |     Resolution:         
  Keywords:                           |             Os:  Unknown
Difficulty:  Unknown                  |   Architecture:  Unknown
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Comment (by claus.reinke at talk21.com):

 actually, the relevant evals/updates would have been in in init and last,
 whereas the problem is visible in initlast, where the pragmas should be.
 so this would have required either a little more thinking if one wanted to
 do it in the compiler, or perhaps there might still be a simple way to tag
 thunks for "please don't update" in the runtime system?

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