def step
import bend-collections@1.0.0.0/src/containers/doubly_linked_list.bend as DoublyLinkedListimport Base
import bend-collections@1.0.0.0/src/containers/types/doubly_linked_list.bend as E
214def step(~T: Data, s: DList<T>, +op: E.Op<T>) -> DList<T> & E.Obs<T>:
215 step_handle(~T, s, op, op_handle(~T, op))