[GHC] #4857: Add Control.Exception.allowInterrupt

[GHC]

#4857: Add Control.Exception.allowInterrupt
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    Reporter:  simonmar          |        Owner:              
        Type:  proposal          |       Status:  new         
    Priority:  normal            |    Milestone:              
   Component:  libraries/base    |      Version:  7.0.1       
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by mitar):

 Hm, my initial idea was to make `uninterruptibleMask` more useful if you
 can also (at precise location) accept exception inside it.

 Maybe we should need two `allowInterrupt` functions? And leave to
 developers to choose the one they want?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4857#comment:6>
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