[GHC] #13104: runRW# ruins join points

[GHC]

#13104: runRW# ruins join points
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        Reporter:  lukemaurer        |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:  JoinPoints
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nomeata):

 Just a warning: I am wary with exposing the `realWorld#` item here. I
 played with similar (less sophisticated) ideas three years ago, and found
 that all too easily different invocations of `runRW#` would end up getting
 mixed up, e.g. by CSE.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13104#comment:5>
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