Class bad_dict_clear

Lib/test/test_set.py:1859–1865

        return 0

class bad_dict_clear:
    def __eq__(self, other):
        if be_bad:
            dict2.clear()
        return self is other
    def __hash__(self):
        return 0

class TestWeirdBugs(unittest.TestCase):
    def test_8420_set_merge(self):