[issue39491] Import PEP 593 (Flexible function and variable annotations) support already implemented in typing_extensions

[Andy Lester]

Change by Andy Lester <andy at petdance.com>:


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pull_requests: +17799
pull_request: https://github.com/python/cpython/pull/18422

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39491>
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