Method mro

Lib/test/test_descr.py:5815–5820

(cls)

        """
        class M(DebugHelperMeta):
            def mro(cls):
                if self.step_until(1):
                    assert cls.__mro__ is None
                    cls.__bases__ += ()

                return type.mro(cls)

        class A(metaclass=M):
            pass