Patch/feature proposal: Provide access to the runStmt sandbox ThreadID

[Edsko de Vries]

Hi,

I believe the right way to fix this is to find all the places in the
> compiler that catch and rethrow exceptions inside unsafePerformIO, and make
> them use throwTo when the exception is asynchronous.


Ok, I have looked at this in detail and I'm not sure how feasible this is.
I have filed a bug, with a test case, and a detailed explanation of my
investigation so far: http://hackage.haskell.org/trac/ghc/ticket/8006.

Edsko
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