Class IntLike

Lib/test/test_itertools.py:1237–1241

        # Issue #30537: islice can accept integer-like objects as
        # arguments
        class IntLike(object):
            def __init__(self, val):
                self.val = val
            def __index__(self):
                return self.val
        self.assertEqual(list(islice(range(100), IntLike(10))), list(range(10)))
        self.assertEqual(list(islice(range(100), IntLike(10), IntLike(50))),
                         list(range(10, 50)))