List.rev_rev: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/proofs/lib/list.bend as List
Lines 159-160 of bend-collections-laws-math@1.0.0.0/proofs/lib/list.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/proofs/lib/list.bend&start_line=159&end_line=160

import Base
import bend-collections-laws-math@1.0.0.0/spec/lib/common.bend as SC

def rev_rev(-A: Data, +xs: List<&2, A>) -> {List.reverse(&2, A, List.reverse.go(&2, A, xs, Nil{})) == xs : List<&2, A>}:
  Equal.trans(List<&2, A>, List.reverse.go(&2, A, List.reverse.go(&2, A, xs, Nil{}), Nil{}), SC.append(A, xs, Nil{}), xs, rev_go_twice(A, xs, Nil{}, Nil{}), append_nil(A, xs))

Uses (7):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.trans
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.reverse
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.reverse.go
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/proofs/lib/list.bend&name=append_nil
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/proofs/lib/list.bend&name=rev_go_twice
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/spec/lib/common.bend&name=append