[issue44368] Invalid mapping patterns give confusing SyntaxErrors

[Brandt Bucher]

Brandt Bucher <brandtbucher at gmail.com> added the comment:

Could we just try parsing "as _" and raise if so? That wouldn't conflict with any existing rules, and that way we could actually have a helpful error message.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44368>
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