def project_value

bend-collections@1.0.0.0 · src/containers/doubly_linked_list.bend:217

import Base
import bend-collections@1.0.0.0/src/containers/types/doubly_linked_list.bend as E

217def project_value(~T: Data, r: DList<T> & E.Obs<T>) -> DList<T> & Result<&2, &2, E.Error, T>:
218  match r:
219    case Tuple{s, E.OVal{x}}:
220      (s, x)
221    case Tuple{s, other}:
222      (s, Fail{E.StaleHandle{}})