[issue44786] test_check_c_globals "crashed" and then "FutureWarning: Possible nested set at position 12"

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Yes, [[] looks as the start of a character set containing nested sets (e.g. "[[a-z]--[p-q]]"). This feature is supported by regex and can be added in future versions of re, breaking the code which contain such combinations.

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