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

vendor/phpunit/php-token-stream/tests/_fixture/source3.php

@@ -0,0 +1,14 @@
+<?php
+// This file is example#1
+// from http://www.php.net/manual/en/function.get-included-files.php
+
+include 'test1.php';
+include_once 'test2.php';
+require 'test3.php';
+require_once 'test4.php';
+
+$included_files = get_included_files();
+
+foreach ($included_files as $filename) {
+    echo "$filename\n";
+}