Deque.Deque.lemma.append_nil: law of bend-kit-collections@0.1.4.1
Import: import bend-kit-collections@0.1.4.1/deque.bend as Deque
Lines 212-215 of bend-kit-collections@0.1.4.1/deque.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-collections@0.1.4.1/deque.bend&start_line=212&end_line=215

import Base

law Deque.lemma.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