Class HasTrunc

numpy/core/tests/test_multiarray.py:8786–8788

            # Python 3.11.
            if sys.version_info < (3, 11):
                class HasTrunc:
                    def __trunc__(self):
                        return 3
                assert_equal(3, int_func(np.array(HasTrunc())))
                with assert_warns(DeprecationWarning):
                    assert_equal(3, int_func(np.array([HasTrunc()])))