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

vendor/symfony/http-kernel/Event/GetResponseEvent.php

@@ -0,0 +1,73 @@
+<?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\Event;
+
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * Allows to create a response for a request.
+ *
+ * Call setResponse() to set the response that will be returned for the
+ * current request. The propagation of this event is stopped as soon as a
+ * response is set.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ *
+ * @api
+ */
+class GetResponseEvent extends KernelEvent
+{
+    /**
+     * The response object.
+     *
+     * @var Response
+     */
+    private $response;
+
+    /**
+     * Returns the response object.
+     *
+     * @return Response
+     *
+     * @api
+     */
+    public function getResponse()
+    {
+        return $this->response;
+    }
+
+    /**
+     * Sets a response and stops event propagation.
+     *
+     * @param Response $response
+     *
+     * @api
+     */
+    public function setResponse(Response $response)
+    {
+        $this->response = $response;
+
+        $this->stopPropagation();
+    }
+
+    /**
+     * Returns whether a response was set.
+     *
+     * @return bool Whether a response was set
+     *
+     * @api
+     */
+    public function hasResponse()
+    {
+        return null !== $this->response;
+    }
+}