List.foldr_cons_nil: law of bend-mathlib@0.8.1.0
Import: import bend-mathlib@0.8.1.0/list.bend as List
Lines 1925-1930 of bend-mathlib@0.8.1.0/list.bend: https://jend.leeeet.dev/read.txt?path=bend-mathlib@0.8.1.0/list.bend&start_line=1925&end_line=1930

import Base

# Folding cons from the right, starting from the empty list, rebuilds the list.
law foldr_cons_nil:
  for ~a: Quant
  for ~A: Kind(a)
  for xs: List<a, A>
  {List.foldr(~a, ~A, ~List<a, A>, ~(x => acc => x <> acc), xs, Nil{}) == xs : List<a, 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.foldr