def off.drop_app_le

bend-osdev-bytes@0.1.1.0 · PROOF.bend:856

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

856def off.drop_app_le(+n: Nat, xs: List<&2, B.OctByte>, +ys: List<&2, B.OctByte>) -> {Nat.is_le(n, List.length(&2, B.OctByte, xs)) == True{} : Bool} -> {B.w8s.drop(n, List.append(&2, B.OctByte, xs, ys)) == List.append(&2, B.OctByte, B.w8s.drop(n, xs), ys) : List<&2, B.OctByte>}:
857  match n xs:
858    case 0n _:
859      h => {==}
860    case 1n+p Nil{}:
861      h => off.no({B.w8s.drop(1n+p, ys) == ys : List<&2, B.OctByte>}, h)
862    case 1n+p Con{x, t}:
863      h => off.drop_app_le(p, t, ys, h)