law length_append
import bend-collections-laws-crypto@1.0.0.0/proofs/crypto/hash/lists.bend as Listsimport Base
68law length_append:
69 for +xs: List<&2, U32>
70 for +ys: List<&2, U32>
71 {List.length(&2, U32, List.append(&2, U32, xs, ys)) == Nat.add(List.length(&2, U32, xs), List.length(&2, U32, ys)) : Nat}