[issue45625] Add support for top-level await

[Fred]

Fred <eldmannen at gmail.com> added the comment:

$ python3 --async myscript.py
unknown option --async

Also I cannot go around telling other people how to run my script. My script must be able to run properly without any special setup.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45625>
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