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