Goal:
  
  G : t
  HI : invariants
  HG : acyclic_no_loop
  s : VSet.t
  x : V.t
  e : lsp0 s x x = None
  H : False
  ============================
   (None = Some 0)


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