[3.13] gh-139905: Provide suggestion in error message if Generic.__init_subclass__ was not called (GH-139943)
#139956
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…it_subclass__` was not called (pythonGH-139943) (cherry picked from commit 5776d0d) Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
miss-islington
requested review from
AlexWaygood and
JelleZijlstra
as code owners
This was referenced Oct 11, 2025
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(cherry picked from commit 5776d0d)
Co-authored-by: Stan Ulbrych 89152624+StanFromIreland@users.noreply.github.com
Generic.__init_subclass__is not called #139905