Class NotConvertible

numpy/core/tests/test_multiarray.py:8750–8752

        assert_raises(ValueError, bool, np.array([1, 2]))

        class NotConvertible:
            def __bool__(self):
                raise NotImplementedError

        assert_raises(NotImplementedError, bool, np.array(NotConvertible()))
        assert_raises(NotImplementedError, bool, np.array([NotConvertible()]))