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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

The same test is crashed in 3.6 even with index_to_entry.diff.

./python -m test.regrtest -F -m test_merge_and_mutate test_set

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24583>
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