[GHC] #12852: threadWaitReadSTM does not provide a way to unregister action.

[GHC]

#12852: threadWaitReadSTM does not provide a way to unregister action.
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        Reporter:  qnikst            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2729
       Wiki Page:                    |
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Changes (by qnikst):

 * differential:  D2729 => Phab:D2729


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12852#comment:2>
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