Akio, I looked at your first patch, which mostly seems good. The
sequence at the beginning of deRefWeak certainly looks strange - I think
it's ok, but it needs a comment.
One thing I'm confused about is the handling of DEAD_WEAK pointers. You
removed the StgDeadWeak struct - how is that possible? I don't
understand why DEAD_WEAK has 4 payload words, but StgDeadWeak has only
one, and furthermore a DEAD_WEAK appears to have the link field in a
different place from the WEAK closure. Something is suspicious here.
Cheers,
Simon
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