[issue43897] Implement support for validation of pattern matching ASTs

[Batuhan Taskaya]

Change by Batuhan Taskaya <isidentical at gmail.com>:


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pull_requests: +25624
pull_request: https://github.com/python/cpython/pull/27074

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43897>
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