+type node_summary = private int
+val node_summary : bool -> bool -> bool -> bool -> Tree.NodeKind.t -> node_summary
+val dummy_summary : node_summary
+type config = {
+ sat : StateSet.t;
+ unsat : StateSet.t;
+ todo : TransList.t;
+ summary : node_summary;
+}
+
+module Config : Hcons.S with type data = config
+val dummy_config : Config.t
+