getSignalMask ghc6.0.1

[Volker Stolz]

In local.glasgow-haskell-users, you wrote:
> I can't do much with the provided examples, because getSignalMask exits 
> the program with:
> 
> Fail: invalid argument
> Action: getSignalMask
> Reason: Invalid argument

Looks like an actual bug in the library. Should be fixed in CVS now.
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