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

vendor/symfony-cmf/routing/DependencyInjection/Compiler/RegisterRouteEnhancersPass.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\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+
+/**
+ * This compiler pass adds additional route enhancers
+ * to the dynamic router.
+ *
+ * @author Daniel Leech <dan.t.leech@gmail.com>
+ * @author Nathaniel Catchpole (catch)
+ */
+class RegisterRouteEnhancersPass implements CompilerPassInterface
+{
+    /**
+     * @var string
+     */
+    protected $dynamicRouterService;
+
+    protected $enhancerTag;
+
+    public function __construct($dynamicRouterService = 'cmf_routing.dynamic_router', $enhancerTag = 'dynamic_router_route_enhancer')
+    {
+        $this->dynamicRouterService = $dynamicRouterService;
+        $this->enhancerTag = $enhancerTag;
+    }
+
+    public function process(ContainerBuilder $container)
+    {
+        if (!$container->hasDefinition($this->dynamicRouterService)) {
+            return;
+        }
+
+        $router = $container->getDefinition($this->dynamicRouterService);
+
+        foreach ($container->findTaggedServiceIds($this->enhancerTag) as $id => $attributes) {
+            $priority = isset($attributes[0]['priority']) ? $attributes[0]['priority'] : 0;
+            $router->addMethodCall('addRouteEnhancer', array(new Reference($id), $priority));
+        }
+    }
+}

vendor/symfony-cmf/routing/DependencyInjection/Compiler/RegisterRoutersPass.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\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+
+/**
+ * Compiler pass to register routers to the ChainRouter.
+ *
+ * @author Wouter J <waldio.webdesign@gmail.com>
+ * @author Henrik Bjornskov <henrik@bjrnskov.dk>
+ * @author Magnus Nordlander <magnus@e-butik.se>
+ */
+class RegisterRoutersPass implements CompilerPassInterface
+{
+    /**
+     * @var string
+     */
+    protected $chainRouterService;
+
+    protected $routerTag;
+
+    public function __construct($chainRouterService = 'cmf_routing.router', $routerTag = 'router')
+    {
+        $this->chainRouterService = $chainRouterService;
+        $this->routerTag = $routerTag;
+    }
+
+    public function process(ContainerBuilder $container)
+    {
+        if (!$container->hasDefinition($this->chainRouterService)) {
+            return;
+        }
+
+        $definition = $container->getDefinition($this->chainRouterService);
+
+        foreach ($container->findTaggedServiceIds($this->routerTag) as $id => $attributes) {
+            $priority = isset($attributes[0]['priority']) ? $attributes[0]['priority'] : 0;
+
+            $definition->addMethodCall('add', array(new Reference($id), $priority));
+        }
+    }
+}