PROOF.off.len_of: def of bend-osdev-bytes@0.1.1.0
Import: import bend-osdev-bytes@0.1.1.0/PROOF.bend as PROOF
Lines 934-939 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=934&end_line=939

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

def off.len_of(xs: List<&2, U32>) -> {List.length(&2, B.OctByte, B.w8s.of_list(xs)) == B.len(xs) : Nat}:
  match xs:
    case Nil{}:
      {==}
    case Con{h, t}:
      Equal.cong(Nat, Nat, k => 1n+k, List.length(&2, B.OctByte, B.w8s.of_list(t)), B.len(t), off.len_of(t))

Uses (8):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.cong
  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=U32
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=OctByte
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=len
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=w8s.of_list