def record
import bend-collections-laws-math@1.0.0.0/src/containers/deque.bend as Dequeimport Base
import bend-collections-laws-math@1.0.0.0/src/containers/types/deque.bend as E
145def record(~T: Data, acc: List<&2, E.Obs<T>>, r: Deque<T> & E.Obs<T>) -> Deque<T> & List<&2, E.Obs<T>>:
146 (d, o) = r
147 (d, Con{o, acc})