BendMlNatLemmas.append_nil: law of bend-ml-nat-lemmas@0.1.2.0
Import: import bend-ml-nat-lemmas@0.1.2.0/main.bend as BendMlNatLemmas
Lines 228-231 of bend-ml-nat-lemmas@0.1.2.0/main.bend: https://jend.leeeet.dev/read.txt?path=bend-ml-nat-lemmas@0.1.2.0/main.bend&start_line=228&end_line=231

import Base

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