def obs_nat
import bend-collections@1.0.0.0/src/containers/dynamic_array.bend as DynamicArrayimport Base
import bend-collections@1.0.0.0/src/containers/types/dynamic_array.bend as E
237def obs_nat(-T: Data, r: DynArray<&2, T> & Nat) -> DynArray<&2, T> & E.Obs<T>:
238 (d, n) = r
239 (d, E.ONat{n})