[issue40769] Pegen: cover extra surrounding parentheses for invalid annotated assignment

[Batuhan Taskaya]

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


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nosy: +gvanrossum, lys.nikolaou, pablogsal

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40769>
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