ProofAppend.append_assoc: law of lawful-bytes@0.1.1.0
Import: import lawful-bytes@0.1.1.0/proof_append.bend as ProofAppend
Lines 33-37 of lawful-bytes@0.1.1.0/proof_append.bend: https://jend.leeeet.dev/read.txt?path=lawful-bytes@0.1.1.0/proof_append.bend&start_line=33&end_line=37

import Base

law append_assoc:
  for +xs: List<&2, U32>
  for +ys: List<&2, U32>
  for +zs: List<&2, U32>
  {List.append(&2, U32, List.append(&2, U32, xs, ys), zs) == List.append(&2, U32, xs, List.append(&2, U32, ys, zs)) : List<&2, U32>}

Uses (3):
  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=Base/base.bend&name=U32