[issue39386] Prevent double awaiting of async iterator

[Andrew Svetlov]

Change by Andrew Svetlov <andrew.svetlov at gmail.com>:


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title: getting invalid data from async iterator -> Prevent double awaiting of async iterator
versions: +Python 3.7, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39386>
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