[issue45323] unexpected behavior on first match case _

[Steven D'Aprano]

Steven D'Aprano <steve+python at pearwood.info> added the comment:

It is a bit tricky to find the documentation for the magic single underscore, but it is here:

https://docs.python.org/3/reference/lexical_analysis.html#reserved-classes-of-identifiers

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<https://bugs.python.org/issue45323>
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