def test_bool(self):
        prio_set_list = event._PrioritizedSetList()

        assert bool(prio_set_list) is False

        prio_set_list.add(0, None)
        assert bool(prio_set_list) is True
def bad(self, f, msg):
        """Callback from dirstate.walk for each explicit file that can't be
        found/accessed, with an error message."""