Method __new__

Lib/test/test_descr.py:1450–1452

(cls, name, bases, namespace, attr)

        # Testing __qualname__ and __classcell__ in __slots__
        class Meta(type):
            def __new__(cls, name, bases, namespace, attr):
                self.assertIn(attr, namespace)
                return super().__new__(cls, name, bases, namespace)

        class C1:
            def __init__(self):