[issue24237] PEP 479: missing DeprecationWarning when generator_stop is not used

[Nick Coghlan]

Nick Coghlan added the comment:

The patch mostly looks good to me, but I suggest using "test.support.check_warnings" for the cases where you're checking that the warning is raised as expected: https://docs.python.org/3/library/test.html#test.support.check_warnings

It's slightly simpler than constructing the same logic yourself using warnings.catch_warnings.

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