static TreeSet<Int> numbersOfMethodArguments(O o, S method, O... _) {
  boolPar noVarArgs;
  Class c;
  bool mustBeStatic = false;
  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;
      if (mustBeStatic && !methodIsStatic(m)) continue;
      if (noVarArgs && m.isVarArgs()) continue;
      numbers.add(l(m.getParameterTypes()));
    }
    c = c.getSuperclass();
  }
  ret numbers;
}