law ends_join

lawful-fields@0.1.1.0 · proof_list.bend:412

import Base
import lawful-fields@0.1.1.0/defs.bend as F

412law ends_join:
413  for +ps: List<&2, List<&2, U32>>
414  for +sep: U32
415  for +from: Nat
416  for +k: Nat
417  for +h: {Nat.is_lt(k, List.length(&2, List<&2, U32>, ps)) == True{} : Bool}
418  {List.get(&2, Nat, F.ends(ps, from), k) == Some{Nat.add(from, List.length(&2, U32, F.join(List.take(&2, List<&2, U32>, ps, Nat.add(k, 1n)), sep)))} : Maybe<&2, Nat>}