Goal:
    G : t  HI : invariants  x : Z  le : 0 <= x  H : x < 0
  ============================
   (0 = x)


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