PROOF.concat_step: def of bend-osdev-bytes@0.1.1.0
Import: import bend-osdev-bytes@0.1.1.0/PROOF.bend as PROOF
Lines 717-721 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=717&end_line=721

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

def concat_step(+ws: List<&2, B.OctByte>, +c: B.Octets, +acc: List<&2, B.OctByte>) -> {B.w8s.rev_onto(B.Octets.words(c), B.w8s.rev_onto(ws, acc)) == B.w8s.rev_onto(B.Octets.words(B.Octets.append(B.Octets{ws}, c)), acc) : List<&2, B.OctByte>}:
  match c:
    case B.Octets{+zs}:
      %F_app(ws, zs) : {B.w8s.rev_onto(zs, B.w8s.rev_onto(ws, acc)) == B.w8s.rev_onto(_, acc) : List<&2, B.OctByte>}
      Equal.sym(List<&2, B.OctByte>, B.w8s.rev_onto(List.append(&2, B.OctByte, ws, zs), acc), B.w8s.rev_onto(zs, B.w8s.rev_onto(ws, acc)), rev_app8(ws, zs, acc))

Uses (10):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.sym
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.append
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/PROOF.bend&name=F_app
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/PROOF.bend&name=rev_app8
  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=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.words
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=w8s.rev_onto