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Fix order of steal/unborrow in tuple unpacking#18732
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JukkaL approved these changesFeb 25, 2025
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I think you are right. This is pretty subtle, but it appears the old logic was wrong.
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Currently, although globally the refcount is correct, it may briefly touch 0 if a target of unpacking in unused, e.g.
_, _, last = some_tuple. This can be prevented by placing steal before unborrow (which IMO should be the recommended way, if I understand the logic of these terms correctly).