Help me grok addFinalizer

[Michael Craig]

When I read the docs for System.Mem.Weak, it all seems to make sense. But
then this code doesn't run as I expect it to when I turn on -threaded:
http://hpaste.org/63832 (Expected/actual output are listed in the paste.)

I've tried this on 7.4.1 and 7.0.4 with the same results. Can someone
enlighten me?

Cheers,
Mike Craig
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