Goal:
    A : Type  n : nat  a : A  IHn : List.rev (repeat a n) = repeat a n
  ============================
   (n + 1 = S n)


DEBUG:Going to execute:
intros; Zify.zify_pre_hook; zify_elim_let; zify_op;
            Zify.zify_iter_specs; Zify.zify_to_euclidean_division_equations;
            Zify.zify_post_hook; zify_saturate