[GHC] #4343: Add throwSTM and generalize catchSTM

[GHC]

#4343: Add throwSTM and generalize catchSTM
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  Reporter:  basvandijk         |          Owner:                                                           
      Type:  proposal           |         Status:  new                                                      
  Priority:  normal             |      Milestone:                                                           
 Component:  libraries (other)  |        Version:  7.1                                                      
Resolution:                     |       Keywords:  stm, exception, throw, throwIO, throwSTM, catch, catchSTM
  Testcase:                     |      Blockedby:                                                           
Difficulty:                     |             Os:  Unknown/Multiple                                         
  Blocking:                     |   Architecture:  Unknown/Multiple                                         
   Failure:  None/Unknown       |  
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Changes (by basvandijk):

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


Comment:

 The latest attached patch conditionally exports `throwSTM` from
 `Control.Monad.GHC` when `base` >= 4.3.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4343#comment:5>
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