[New-bugs-announce] [issue39590] collections.deque.__contains__ and .count should hold strong references.

[Dennis Sweeney]

New submission from Dennis Sweeney <sweeney.dennis650 at gmail.com>:

Similar to https://bugs.python.org/issue39453, but with deques:

Python 3.9.0a3+:

>>> from collections import deque
>>> class A:
...     def __eq__(self, other):
...         L.clear()
...         return NotImplemented
...
>>> L = [A(), A(), A()]
>>> 17 in L
False
>>> L = deque([A(), A(), A()])
>>> 17 in L

(Crashes with "Unhandled exception thrown: read access violation.")

----------
components: Library (Lib)
messages: 361642
nosy: Dennis Sweeney
priority: normal
severity: normal
status: open
title: collections.deque.__contains__ and .count should hold strong references.
type: crash
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39590>
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