PROOF.off.len_drop: def of bend-osdev-bytes@0.1.1.1
Import: import bend-osdev-bytes@0.1.1.1/PROOF.bend as PROOF
Lines 916-925 of bend-osdev-bytes@0.1.1.1/PROOF.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-bytes@0.1.1.1/PROOF.bend&start_line=916&end_line=925

import Base
import bend-osdev-bytes@0.1.1.1/bytes.bend as B

def off.len_drop(+n: Nat, ws: List<&2, B.OctByte>) -> {List.length(&2, B.OctByte, B.w8s.drop(n, ws)) == Nat.sub(List.length(&2, B.OctByte, ws), n) : Nat}:
  match n ws:
    case 0n Nil{}:
      {==}
    case 0n Con{x, t}:
      {==}
    case 1n+p Nil{}:
      {==}
    case 1n+p Con{x, t}:
      off.len_drop(p, t)

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.length
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.sub
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.1/bytes.bend&name=OctByte
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.1/bytes.bend&name=w8s.drop