List.append_nil: law of bend-lawful-stdlib@0.1.0.0
Import: import bend-lawful-stdlib@0.1.0.0/src/list.bend as List
Lines 23-26 of bend-lawful-stdlib@0.1.0.0/src/list.bend: https://jend.leeeet.dev/read.txt?path=bend-lawful-stdlib@0.1.0.0/src/list.bend&start_line=23&end_line=26

import Base

law append_nil:
  for -A: Data
  for xs: List<&2, A>
  {xs == List.append(&2, A, xs, Nil{}) : List<&2, A>}

Uses (2):
  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