[GHC] #767: withMVar family have a bug

[GHC]

#767: withMVar family have a bug
----------------------+-----------------------------------------------------
 Reporter:  simonmar  |          Owner:         
     Type:  bug       |         Status:  new    
 Priority:  normal    |      Milestone:  6.8    
Component:  Compiler  |        Version:  6.4.1  
 Severity:  normal    |     Resolution:         
 Keywords:            |     Difficulty:  Unknown
 Testcase:  N/A       |   Architecture:  Unknown
       Os:  Unknown   |  
----------------------+-----------------------------------------------------
Changes (by igloo):

  * milestone:  => 6.8
  * testcase:  => N/A

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/767>
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