def obs_nat
import bend-collections@1.0.0.0/src/containers/queue.bend as Queueimport Base
import bend-collections@1.0.0.0/src/containers/types/queue.bend as E
54def obs_nat(~T: Data, r: Queue<T> & Nat) -> Queue<T> & E.Obs<T>:
55 (q, n) = r
56 (q, E.ONat{n})