DoublyLinkedList.project_length: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/src/containers/doubly_linked_list.bend as DoublyLinkedList
Lines 245-250 of bend-collections@1.0.0.0/src/containers/doubly_linked_list.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/src/containers/doubly_linked_list.bend&start_line=245&end_line=250

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

def project_length(~T: Data, r: DList<T> & E.Obs<T>) -> DList<T> & Nat:
  match r:
    case Tuple{s, E.ONat{x}}:
      (s, x)
    case Tuple{s, other}:
      (s, 0n)

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/containers/doubly_linked_list.bend&name=DList
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/containers/types/doubly_linked_list.bend&name=Obs