[GHC] #1657: throwTo + unsafeInterleaveIO oddness

[GHC]

#1657: throwTo + unsafeInterleaveIO oddness
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    Reporter:  guest           |        Owner:              
        Type:  bug             |       Status:  merge       
    Priority:  normal          |    Milestone:  _|_         
   Component:  Runtime System  |      Version:  6.6.1       
    Keywords:                  |     Testcase:              
   Blockedby:                  |   Difficulty:  Unknown     
          Os:  Windows         |     Blocking:              
Architecture:  x86             |      Failure:  None/Unknown
-------------------------------+--------------------------------------------

Comment(by simonmar):

 See also #2558.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1657#comment:11>
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