def p_slice_append_add

bend-osdev-bytes@0.1.1.0 · PROOF.bend:1214

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

1214def p_slice_append_add(+a: B.Octets, +i: Nat, +n: Nat, +b: B.Octets) -> {B.Octets.slice(Nat.add(B.Octets.len(a), i), n, B.Octets.append(a, b)) == B.Octets.slice(i, n, b) : B.Octets}:
1215  Equal.cong(B.Octets, B.Octets, x => B.Octets.take(n, x), B.Octets.drop(Nat.add(B.Octets.len(a), i), B.Octets.append(a, b)), B.Octets.drop(i, b), p_drop_append_add(a, i, b))