def pop_back
import bend-collections@1.0.0.0/src/containers/deque.bend as Dequeimport Base
import bend-collections@1.0.0.0/src/containers/types/deque.bend as E
99def pop_back(~T: Data, d: Deque<T>) -> Deque<T> & Result<&2, &2, E.Error, T>:
100 pop_back_ready(~T, ready_back(~T, d))