[issue40599] Improve error messages with expected keywords

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

> (Huh, where did it get __new_parser__?)

>From here:

https://github.com/python/cpython/blob/master/Parser/pegen/parse.c#L67

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<https://bugs.python.org/issue40599>
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