PROOF.p_drop_append_le: def of bend-osdev-bytes@0.1.1.0
Import: import bend-osdev-bytes@0.1.1.0/PROOF.bend as PROOF
Lines 1200-1203 of bend-osdev-bytes@0.1.1.0/PROOF.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-bytes@0.1.1.0/PROOF.bend&start_line=1200&end_line=1203

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

def p_drop_append_le(+n: Nat, +a: B.Octets, +b: B.Octets) -> {Nat.is_le(n, B.Octets.len(a)) == True{} : Bool} -> {B.Octets.drop(n, B.Octets.append(a, b)) == B.Octets.append(B.Octets.drop(n, a), b) : B.Octets}:
  match a b:
    case B.Octets{+xs} B.Octets{+ys}:
      h => q_drop_app_le(n, xs, ys, off.len_fast_le(n, xs, h))

Uses (9):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.is_le
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/PROOF.bend&name=off.len_fast_le
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/PROOF.bend&name=q_drop_app_le
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=Octets
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=Octets.append
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=Octets.drop
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=Octets.len