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

vendor/symfony-cmf/routing/NestedMatcher/FinalMatcherInterface.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\NestedMatcher;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Routing\RouteCollection;
+use Symfony\Component\Routing\Exception\ResourceNotFoundException;
+
+/**
+ * A FinalMatcher returns only one route from a collection of candidate routes.
+ *
+ * @author Larry Garfield
+ * @author David Buchmann
+ */
+interface FinalMatcherInterface
+{
+    /**
+    * Matches a request against a route collection and returns exactly one result.
+    *
+    * @param RouteCollection $collection The collection against which to match.
+    * @param Request $request The request to match.
+    *
+    * @return array An array of parameters
+    *
+    * @throws ResourceNotFoundException if none of the routes in $collection
+    *    matches $request
+    */
+    public function finalMatch(RouteCollection $collection, Request $request);
+}