[issue46838] Parameters and arguments parser syntax error improvments

[Andrej Klychin]

Andrej Klychin <andy_kl at bk.ru> added the comment:

@terry.reedy, I based that error message on current >>> foo(**{}, *())
SyntaxError: iterable argument unpacking follows keyword argument unpacking

and >>> foo(__debug__=True)
SyntaxError: cannot assign to __debug__

but the final error message could be anything if it explicitly says "what's wrong".

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46838>
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