[GHC] #3159: QSem fails with negative quantities

[GHC]

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

  * status:  closed => reopened
  * resolution:  fixed =>

Comment:

 It seems a shame that when we could provide total implementations of these
 functions, with intuitive semantics, we choose to make the functions
 partial. Perhaps leave this ticket open at a low priority to indicate that
 desire?

 If the exception is the way to go, it should at least be documented in the
 Haddock.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3159#comment:4>
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