val all_nodes : Naive_tree.t -> Naive_tree.node list
(** [all_nodes t] returns all the nodes in the tree [t].
Returns an empty list if there are no nodes in the tree.
val all_nodes : Naive_tree.t -> Naive_tree.node list
(** [all_nodes t] returns all the nodes in the tree [t].
Returns an empty list if there are no nodes in the tree.