[issue35975] Put back the ability to parse files where async/await aren't keywords

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

Actually, I think we could revert to old lexer hacks in 3.8 if we modify them to treat 'async for' tocken sequence as one meta-tocken.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35975>
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