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

vendor/symfony-cmf/routing/RouteReferrersReadInterface.php

@@ -0,0 +1,28 @@
+<?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;
+
+use Symfony\Component\Routing\Route;
+
+/**
+ * Interface to be implemented by content that wants to be support route generation
+ * from content with the DynamicRouter by providing the routes that point to it.
+ */
+interface RouteReferrersReadInterface
+{
+    /**
+     * Get the routes that point to this content.
+     *
+     * @return Route[] Route instances that point to this content
+     */
+    public function getRoutes();
+}