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

vendor/symfony-cmf/routing/RouteObjectInterface.php

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+<?php
+
+/*
+ * This file is part of the Symfony CMF package.
+ *
+ * (c) 2011-2014 Symfony CMF
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Cmf\Component\Routing;
+
+/**
+ * Classes for entries in the routing table may implement this interface in
+ * addition to extending Symfony\Component\Routing\Route.
+ *
+ * If they do, the DynamicRouter will request the route content and put it into
+ * the RouteObjectInterface::CONTENT_OBJECT field. The DynamicRouter will also
+ * request getRouteKey and this will be used instead of the symfony core compatible
+ * route name and can contain any characters.
+ *
+ * Some fields in defaults have a special meaning in the getDefaults(). In addition
+ * to the constants defined in this class, _locale and _controller are also used.
+ */
+interface RouteObjectInterface
+{
+    /**
+     * Field name that will hold the route name that was matched.
+     */
+    const ROUTE_NAME = '_route';
+
+    /**
+     * Field name of the route object that was matched.
+     */
+    const ROUTE_OBJECT = '_route_object';
+
+    /**
+     * Field name for an explicit controller name to be used with this route
+     */
+    const CONTROLLER_NAME = '_controller';
+
+    /**
+     * Field name for an explicit template to be used with this route.
+     * i.e. CmfContentBundle:StaticContent:index.html.twig
+     */
+    const TEMPLATE_NAME = '_template';
+
+    /**
+     * Field name for the content of the current route, if any.
+     */
+    const CONTENT_OBJECT = '_content';
+
+    /**
+     * Get the content document this route entry stands for. If non-null,
+     * the ControllerClassMapper uses it to identify a controller and
+     * the content is passed to the controller.
+     *
+     * If there is no specific content for this url (i.e. its an "application"
+     * page), may return null.
+     *
+     * @return object the document or entity this route entry points to
+     */
+    public function getContent();
+
+    /**
+     * Get the route key.
+     *
+     * This key will be used as route name instead of the symfony core compatible
+     * route name and can contain any characters.
+     *
+     * Return null if you want to use the default key.
+     *
+     * @return string the route name
+     */
+    public function getRouteKey();
+}