[issue24583] set.update(): Crash when source set is changed during merging

[Roundup Robot]

Roundup Robot added the comment:

New changeset 5c3812412b6f by Raymond Hettinger in branch '3.5':
Issue #24583: Fix crash when set is mutated while being updated.
https://hg.python.org/cpython/rev/5c3812412b6f

New changeset 05cb67dab161 by Raymond Hettinger in branch 'default':
Issue #24583: Fix crash when set is mutated while being updated.
https://hg.python.org/cpython/rev/05cb67dab161

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nosy: +python-dev

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