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

vendor/doctrine/collections/tests/Doctrine/Tests/TestInit.php

@@ -0,0 +1,21 @@
+<?php
+/*
+ * This file bootstraps the test environment.
+ */
+namespace Doctrine\Tests;
+
+error_reporting(E_ALL | E_STRICT);
+
+// register silently failing autoloader
+spl_autoload_register(function($class) {
+    if (0 === strpos($class, 'Doctrine\Tests\\')) {
+        $path = __DIR__.'/../../'.strtr($class, '\\', '/').'.php';
+        if (is_file($path) && is_readable($path)) {
+            require_once $path;
+
+            return true;
+        }
+    }
+});
+
+require_once __DIR__ . "/../../../vendor/autoload.php";