def project_neighbour
bend-collections@1.0.0.0 · src/containers/doubly_linked_list.bend:238
import bend-collections@1.0.0.0/src/containers/doubly_linked_list.bend as DoublyLinkedList
import Base
import bend-collections@1.0.0.0/src/containers/types/doubly_linked_list.bend as E
238def project_neighbour(~T: Data, r: DList<T> & E.Obs<T>) -> DList<T> & Result<&2, &2, E.Error, Maybe<&2, E.Handle>>:
239 match r:
240 case Tuple{s, E.ONbr{x}}:
241 (s, x)
242 case Tuple{s, other}:
243 (s, Fail{E.StaleHandle{}})