(** We show that initial states satisfy the invariant. *)

(* Specifications: *)
Lemma start_state_good:
forall enode eval, good_state (start_state enode eval).
Lemma start_state_nodeset_good:
forall enodes, good_state (start_state_nodeset enodes).
Lemma start_state_allnodes_good:
good_state start_state_allnodes.