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

vendor/sebastian/comparator/tests/_files/Book.php

@@ -0,0 +1,21 @@
+<?php
+/*
+ * This file is part of the Comparator package.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace SebastianBergmann\Comparator;
+
+/**
+ * A book.
+ *
+ */
+class Book
+{
+    // the order of properties is important for testing the cycle!
+    public $author = null;
+}