static void web_labelToLabel(Web web, Lisp in, Lisp out) {
  web_labelToLabel(web, web.nodes, in, out);
}

static void web_labelToLabel(Web web, L<WebNode> nodes, Lisp in, Lisp out) {
  //print("labelToLabel " + in + " => " + out);
  for (WebNode node : nodes)
    if (node.hasLabel(in)) {
      node.addLabel(out);
      //print("labelToLabel " + node);
    }
}