static boolean snlIsList(Lisp tree) {
  S head = tree.head;
  L<S> tok = codeTokensOnly(javaTok(head));
  if (l(tok) == 0) ret false;
  for (int i = 0; i < l(tok); i++)
    if (!eq(tok.get(i), (i & 1) == 0 ? "*" : ","))
      ret false;
  ret true;
}