[issue24581] Crash when a set is changed during iteration

[Roundup Robot]

Roundup Robot added the comment:

New changeset 648c9fb3bdf5 by Raymond Hettinger in branch 'default':
Issue 24581: Revert c9782a9ac031 pending a stronger test for mutation during iteration.
https://hg.python.org/cpython/rev/648c9fb3bdf5

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nosy: +python-dev

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<http://bugs.python.org/issue24581>
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