Class L

Lib/test/test_sys.py:1887–1888

            __slots__ = 'a', 'b', 'c'
        check(D(x=[]), {'x': []}, '3P')
        class L(list):
            __slots__ = 'a', 'b', 'c'
        check(L(), [], '3P')
        class S(set):
            __slots__ = 'a', 'b', 'c'