(** * Properties of node enumeration *)
(** An enumeration of CFG nodes is correct if the following conditions hold: - All nodes for reachable basic blocks must be in the list. - The list is without repetition (so that no code duplication occurs).  We prove that the result of the [enumerate] function satisfies both conditions. *)

Lemma enumerate_norepet:
forall f enum,
enumerate f = OK enum ->
list_norepet enum.