Update to Drupal 8.1.0. For more information, see https://www.drupal.org/drupal-8.1.0-release-notes

vendor/symfony/polyfill-php54/bootstrap.php

@@ -0,0 +1,27 @@
+<?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.
+ */
+
+use Symfony\Polyfill\Php54 as p;
+
+if (PHP_VERSION_ID < 50400) {
+    if (!function_exists('trait_exists')) {
+        function trait_exists($class, $autoload = true) { return $autoload && class_exists($class, $autoload) && false; }
+    }
+    if (!function_exists('class_uses')) {
+        function class_uses($class, $autoload = true) { return $autoload && class_exists($class, $autoload) && false; }
+    }
+    if (!function_exists('hex2bin')) {
+        function hex2bin($data) { return p\Php54::hex2bin($data); }
+    }
+    if (!function_exists('session_register_shutdown')) {
+        function session_register_shutdown() { register_shutdown_function('session_write_close'); }
+    }
+}