[GHC] #7787: modifyMVar does not restore value if callback returns error value

[GHC]

#7787: modifyMVar does not restore value if callback returns error value
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        Reporter:  joeyadams                    |            Owner:
            Type:  bug                          |  simonmar
        Priority:  high                         |           Status:  closed
       Component:  libraries/base               |        Milestone:  7.8.1
      Resolution:  fixed                        |          Version:  7.7
Operating System:  Unknown/Multiple             |         Keywords:
 Type of failure:  Incorrect result at runtime  |     Architecture:
       Test Case:                               |  Unknown/Multiple
        Blocking:                               |       Difficulty:
                                                |  Unknown
                                                |       Blocked By:
                                                |  Related Tickets:
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Changes (by simonmar):

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


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7787#comment:7>
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