static void interpret(S cmd) {
  L<S> tok = javaTok(cmd);
  S functionName = tok.get(1);
  new L<S> args;
  if (tok.size() > 7) {
    assertEquals("(", tok.get(3));
    int i = 5;
    while (i < tok.size() && !eq(tok.get(i), ")")) {
      args.add(unquote(tok.get(i)));
      i += 2;
      if (tok.get(i).equals(","))
        i += 2;
    }
  }
  call(main.class, functionName, args.toArray(new String[args.size()]));
}