def __iter__(self):
        class BadIterator(object):
            def next(self):
                raise RuntimeError("This is a really bad case.")
        return BadIterator()
Iterate the stack in LIFO order.
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/python/test/test_sendmsg.py/WorseList.__iter__--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/gcloud-python/gcloud/_helpers.py/_LocalStack.__iter__