static void web_addLabels(WebNode node, L<Lisp> labels) {
  node.addLabels(labels);
}

static void web_addLabels(WebNode node, WebNode src) {
  if (src != null) node.addLabels(src.labels);
}

static void web_addLabels(WebNode node, O labels) {
  if (labels == null) ret;
  if (labels instanceof S) ret with web_addLabel(node, (S) labels);
  if (labels instanceof Collection) ret with web_addStrings(node, (Collection) labels);
  fail("huh: " + className(labels));
}