Class NegativeLen

Lib/test/test_builtin.py:1333–1335

                return 4.5
        self.assertRaises(TypeError, len, FloatLen())
        class NegativeLen:
            def __len__(self):
                return -10
        self.assertRaises(ValueError, len, NegativeLen())
        class HugeLen:
            def __len__(self):