static int numberOfMethodArguments(O o, S method) {
  Class c;
  bool mustBeStatic = false;
  if (o instanceof Class) {
    c = (Class) o;
    mustBeStatic = true;
  } else
    c = o.getClass();
      
  Class _c = c;
  int n = -1;
  while (c != null) {
    for (Method m : c.getDeclaredMethods()) {
      if (!m.getName().equals(method)) continue;
      if (mustBeStatic && !methodIsStatic(m)) continue;
      int nn = l(m.getParameterTypes());
      if (n == -1) n = nn;
      else if (n != nn) fail("Variable number of method arguments: " + _c + "." + method);
    }
    c = c.getSuperclass();
  }
  if (n == -1) fail("Method not found: " + _c + "." + method);
  ret n;
}