[issue40939] Remove the old parser

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

See also https://github.com/python/cpython/pull/19969 (Pablo's attempt at replacing the grammar in the reference docs with something derived from Grammar/python.gram).

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40939>
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