[GHC] #3159: QSem fails with negative quantities

[GHC]

#3159: QSem fails with negative quantities
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 Reporter:  NeilMitchell      |          Owner:                  
     Type:  bug               |         Status:  new             
 Priority:  normal            |      Milestone:                  
Component:  libraries/base    |        Version:  6.10.2          
 Severity:  major             |     Resolution:                  
 Keywords:                    |       Testcase:                  
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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Changes (by NeilMitchell):

 * cc: ndmitchell at gmail.com (added)

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3159#comment:1>
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