def obs_handle
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
458def obs_handle(~T: Data, r: DList<T> & E.Handle) -> DList<T> & E.Obs<T>:
459 (s, h) = r
460 (s, E.OHandle{h})