Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/vendor/symfony/dependency-injection/ContainerAwareTrait.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection;
+
+/**
+ * ContainerAware trait.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+trait ContainerAwareTrait
+{
+    /**
+     * @var ContainerInterface
+     */
+    protected $container;
+
+    /**
+     * Sets the Container associated with this Controller.
+     *
+     * @param ContainerInterface $container A ContainerInterface instance
+     */
+    public function setContainer(ContainerInterface $container = null)
+    {
+        $this->container = $container;
+    }
+}