Class M

Lib/test/test_str.py:1148–1153

                return int.__format__(self * 2, format_spec)

        class M:
            def __init__(self, x):
                self.x = x
            def __repr__(self):
                return 'M(' + self.x + ')'
            __str__ = None

        class N:
            def __init__(self, x):