gistfile1.aw

<?php

namespace Drupal\my_module\Plugins\Blocks

use Drupal\Component\Plugin\Annotations\Plugin;
use Drupal\Component\Plugin\Annotations\Type;
use Drupal\Component\Plugin\Annotations\Title;
use Drupal\Component\Plugin\Annotations\Description;

/**
 * @Plugin
 * @Type menu_block
 * @Title Menu Block
 * @Description A block for displaying system or user generated menus.
 */
  class SystemBlock extends BlockPlugin {}