+/**
+ Touches every class in specified order:
+ - first the super class
+ - second the class itself
+ - third the sub classes. If new classes are created
+ during the traversal these will be visited, too. **/
+/** @@@ should be named class-walk **/
+/* @@@ will be removed? */
+void type_walk_super2sub(type_walk_func *pre,
+ type_walk_func *post,
+ void *env);
+
+/**
+ Touches every class in specified order:
+ - first the super class
+ - second the class itself
+ If new classes are created during the traversal these
+ will be visited, too. **/
+void type_walk_super(type_walk_func *pre,
+ type_walk_func *post,
+ void *env);
+
+/* Same as type_walk_super2sub, but visits only class types.
+ Executes pre for a class if all superclasses have been visited.
+ Then iterates to subclasses. Executes post after return from
+ subclass.
+ Does not visit global type, frame types.
+*/
+/* @@@ ?? something is wrong with this. */
+void class_walk_super2sub(class_walk_func *pre,
+ class_walk_func *post,
+ void *env);
+