Goal:
    A : Type  d : A  v : A  H : d = v
  ============================
   (None = None ∧ v = d)


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