[issue30406] async and await should be keywords in 3.7

[Pierre Quentel]

Pierre Quentel <pierre.quentel at gmail.com> added the comment:

According to PEP 492, async and await should have been deprecated in 3.5 and 3.6, but I don't think they have been :

await = 1
def f(async=True):
    ...

don't raise any deprecation warning in 3.6.

Since version 3.7 will break existing code with a SyntaxError, could it be possible to have something explicit in the SyntaxError message for these new keywords, for instance

SyntaxError : 'async' is a keyword

I don't speack C so I can't provide a patch, sorry.

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nosy: +quentel

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