[GHC] #7991: stm: add mkWeakTVar

[GHC]

#7991: stm: add mkWeakTVar
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    Reporter:  errge              |       Owner:  simonmar        
        Type:  feature request    |      Status:  new             
    Priority:  normal             |   Milestone:  7.8.1           
   Component:  libraries (other)  |     Version:  7.6.3           
    Keywords:                     |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple   |     Failure:  None/Unknown    
  Difficulty:  Unknown            |    Testcase:                  
   Blockedby:                     |    Blocking:                  
     Related:                     |  
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Changes (by simonmar):

  * owner:  => simonmar
  * difficulty:  => Unknown
  * milestone:  => 7.8.1


Comment:

 Thanks, looks good.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7991#comment:1>
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