def corofunc2():
            called[1] += 1
            return event.ReturnValue(insert_events=[evt3], append_events=[evt2])
def test_either():
    """Either f or g."""
    p = are.above(3) | are.below(2)
    ps = [p(x) for x in range(1, 6)]
    assert ps == [True, False, False, True, True]