[GHC] #3945: Bugs (with fixes) in withThread and runInUnboundThread

[GHC]

#3945: Bugs (with fixes) in withThread and runInUnboundThread
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    Reporter:  basvandijk        |        Owner:  igloo       
        Type:  bug               |       Status:  merge       
    Priority:  high              |    Milestone:  6.12.3      
   Component:  libraries/base    |      Version:  6.12.1      
    Keywords:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Testcase:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Changes (by igloo):

  * type:  merge => bug


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3945#comment:4>
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