def obs_list
import bend-collections@1.0.0.0/src/containers/internal/dlist_storage.bend as DlistStorageimport Base
import bend-collections@1.0.0.0/src/containers/types/internal_dlist.bend as E
478def obs_list(~T: Data, r: DList<T> & List<&2, T>) -> DList<T> & E.Obs<T>:
479 (s, xs) = r
480 (s, E.OList{xs})