code: public ClassNode visitAnnotatedClasses($.Visitor<ClassNode> visitor) {
          for (ClassNode annotated : this.annotated) {
              visitor.apply(annotated);
          }
          return this;
      }
docs: Accept a visitor that visit all class node that has been annotated by the
  class represented by this `ClassNode`
  @param visitor the function that take `ClassNode` as argument
  @return this `ClassNode` instance