[issue44368] Invalid mapping patterns give confusing SyntaxErrors

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado <pablogsal at gmail.com>:


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pull_requests: +25218
pull_request: https://github.com/python/cpython/pull/26632

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