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

vendor/symfony/http-kernel/Log/LoggerInterface.php

@@ -0,0 +1,54 @@
+<?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\Log;
+
+use Psr\Log\LoggerInterface as PsrLogger;
+
+/**
+ * LoggerInterface.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since version 2.2, to be removed in 3.0. Type-hint \Psr\Log\LoggerInterface instead.
+ *
+ * @api
+ */
+interface LoggerInterface extends PsrLogger
+{
+    /**
+     * @api
+     *
+     * @deprecated since version 2.2, to be removed in 3.0. Use emergency() which is PSR-3 compatible.
+     */
+    public function emerg($message, array $context = array());
+
+    /**
+     * @api
+     *
+     * @deprecated since version 2.2, to be removed in 3.0. Use critical() which is PSR-3 compatible.
+     */
+    public function crit($message, array $context = array());
+
+    /**
+     * @api
+     *
+     * @deprecated since version 2.2, to be removed in 3.0. Use error() which is PSR-3 compatible.
+     */
+    public function err($message, array $context = array());
+
+    /**
+     * @api
+     *
+     * @deprecated since version 2.2, to be removed in 3.0. Use warning() which is PSR-3 compatible.
+     */
+    public function warn($message, array $context = array());
+}