[issue23631] 3.5 (a2) traceback regression snarls Idle

[Roundup Robot]

Roundup Robot added the comment:

New changeset ea3cc128ce35 by Robert Collins in branch 'default':
Issue #23631: Fix traceback.format_list when a traceback has been mutated.
https://hg.python.org/cpython/rev/ea3cc128ce35

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nosy: +python-dev

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