how to catch GHC "no threads to run" exception?

[Volker Stolz]

In local.haskell, you wrote:
> test: no threads to run:  infinite loop or deadlock?
> My problem is that this behavior is actually desired, but
> how do I catch this exception and do some bookkeeping
> (closing external IO, etc.) and then a proper exit?

You can wrap the `takeMVar' with Exception.catch. Note that
Prelude.catch won't suffice.
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