Deque.Deque.to_list.from_list: law of bend-kit-collections@0.1.4.1
Import: import bend-kit-collections@0.1.4.1/deque.bend as Deque
Lines 243-247 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=243&end_line=247

import Base

# LAW: a list read into a deque reads back as itself
law Deque.to_list.from_list:
  for -A: Data
  for  xs: List<&2, A>
  {Deque.to_list(&2, A, Deque.from_list(&2, A, xs)) == xs : List<&2, A>}

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/deque.bend&name=Deque.from_list
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/deque.bend&name=Deque.lemma.append_nil
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/deque.bend&name=Deque.to_list