-val trace : ?msg:string -> int -> int -> StateSet.t -> StateSet.t -> unit
-(** [trace nid round d t msg] records the message [msg] together
- with the a node preorder [nid], the [round], the [d]one set and
- the [t]odo set *)
-val finalize_node : int -> int -> bool -> unit
-val gen_trace : Ata.t -> (module Tree.S with type t = 'a) -> 'a -> unit
+val gen_trace : Ata.t -> StateSet.t array list -> (module Tree.S with type t = 'a) -> 'a -> unit