## Feature CPython: ```python >>> from collections import deque >>> deque(range(3)) + deque(range(3)) deque([0, 1, 2, 0, 1, 2]) ``` RustPython: ```python >>>>> from collections import deque >>>>> deque(range(3)) + deque(range(3)) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: '+' not supported between instances of 'deque' and 'deque' ```