static TreeSet<Int> numbersOfMethodArguments(O o, S method) {
  Class c;
  bool mustBeStatic;
  if (o instanceof Class) {
    c = (Class) o;
    mustBeStatic = true;
  } else
    c = o.getClass();
      
  new TreeSet<Int> numbers;
  while (c != null) {
    for (Method m : c.getDeclaredMethods()) {
      if (!m.getName().equals(method)) continue;
      int n = l(m.getParameterTypes());
      numbers.add(nn);
    }
    c = c.getSuperclass();
  }
  ret numbers;
}