Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/http-kernel/Controller/ControllerReference.php

@@ -0,0 +1,46 @@
+<?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\HttpKernel\Controller;
+
+use Symfony\Component\HttpKernel\Fragment\FragmentRendererInterface;
+
+/**
+ * Acts as a marker and a data holder for a Controller.
+ *
+ * Some methods in Symfony accept both a URI (as a string) or a controller as
+ * an argument. In the latter case, instead of passing an array representing
+ * the controller, you can use an instance of this class.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @see FragmentRendererInterface
+ */
+class ControllerReference
+{
+    public $controller;
+    public $attributes = array();
+    public $query = array();
+
+    /**
+     * Constructor.
+     *
+     * @param string $controller The controller name
+     * @param array  $attributes An array of parameters to add to the Request attributes
+     * @param array  $query      An array of parameters to add to the Request query string
+     */
+    public function __construct($controller, array $attributes = array(), array $query = array())
+    {
+        $this->controller = $controller;
+        $this->attributes = $attributes;
+        $this->query = $query;
+    }
+}