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

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

That should still work. The strategy is as follows:

- For Python 3.7 or higher, 'async' and 'await' are *always* recognized.

- For Python 3.5 and 3.6, the hacks from the PEP are used.

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<https://bugs.python.org/issue35975>
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