def w8s_take_app

bend-osdev-bytes@0.1.1.0 · PROOF.bend:200

import Base
import bend-osdev-bytes@0.1.1.0/bytes.bend as B

200def w8s_take_app(xs: List<&2, B.OctByte>, ys: List<&2, B.OctByte>) -> {B.w8s.take(List.length(&2, B.OctByte, xs), List.append(&2, B.OctByte, xs, ys)) == xs : List<&2, B.OctByte>}:
201  match xs:
202    case Nil{}:
203      {==}
204    case Con{h, t}:
205      %w8s_take_app(t, ys) : {Con{h, B.w8s.take(List.length(&2, B.OctByte, t), List.append(&2, B.OctByte, t, ys))} == Con{h, _} : List<&2, B.OctByte>}
206      {==}