_printRImpl.invoke(obj, env, out, depth, valueSet); return true;
  protected boolean printRImpl(Env env,                               Object obj,                               WriteStream out,                               int depth,                               IdentityHashMap<Value, String> valueSet)    throws IOException, Throwable  {    if (_printRImpl == null) {      return false;    }    _printRImpl.invoke(obj, env, out, depth, valueSet);    return true;  }