[issue35930] Raising an exception raised in a "future" instance will create reference cycles

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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nosy: +miss-islington
nosy_count: 1.0 -> 2.0
pull_requests: +23820
pull_request: https://github.com/python/cpython/pull/25070

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35930>
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