class AbstractManagedChannelImplBuilder extends ManagedChannelBuilder<T> {

  @Override
  public final T userAgent(@Nullable String userAgent) {
    this.userAgent = userAgent;
    return thisT();
  }

  protected  AbstractManagedChannelImplBuilder(String target);
  protected  AbstractManagedChannelImplBuilder(SocketAddress directServerAddress, String authority);

}