[issue25135] Deques to adopt the standard clearing procedure for mutable objects

[Roundup Robot]

Roundup Robot added the comment:

New changeset 005590a4a005 by Raymond Hettinger in branch '3.5':
Issue #25135: Avoid possible reentrancy issues in deque_clear.
https://hg.python.org/cpython/rev/005590a4a005

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nosy: +python-dev

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<http://bugs.python.org/issue25135>
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