def rev_rr
import bend-osdev-bpf@0.1.0.0/PROOF.bend as PROOFimport Base
500def rev_rr(-A: Data, xs: List<&2, A>, acc: List<&2, A>, b: List<&2, A>) -> {List.reverse.go(&2, A, List.reverse.go(&2, A, xs, acc), b) == List.reverse.go(&2, A, acc, List.append(&2, A, xs, b)) : List<&2, A>}:
501 match xs:
502 case Nil{}:
503 {==}
504 case Con{h, t}:
505 rev_rr(A, t, Con{h, acc}, b)