[issue33018] Improve issubclass() error checking and message

[Ivan Levkivskyi]

Ivan Levkivskyi <levkivskyi at gmail.com> added the comment:


New changeset 5d8bb5d07be2a9205e7059090f0ac5360d36b217 by Ivan Levkivskyi (Miss Islington (bot)) in branch '3.7':
bpo-32999: Revert GH-6002 (fc7df0e6) (GH-6189) (GH-6190)
https://github.com/python/cpython/commit/5d8bb5d07be2a9205e7059090f0ac5360d36b217


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<https://bugs.python.org/issue33018>
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