Pablo Galindo Salgado <pablog...@gmail.com> added the comment:

It means the same as if there is alternatives: if it fails to parse then it 
will immediately fail. We place them in rules like this in preparation for 
extension or in case there are invalid_* rules in the same set (which doesn't 
appear in the grammar definition).

----------
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46485>
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