[issue32023] Always require parentheses for genexps in base class lists

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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dependencies: +Disallow ambiguous syntax f(x for x in [1],)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32023>
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