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

vendor/symfony/dependency-injection/Loader/PhpFileLoader.php

@@ -0,0 +1,49 @@
+<?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\DependencyInjection\Loader;
+
+use Symfony\Component\Config\Resource\FileResource;
+
+/**
+ * PhpFileLoader loads service definitions from a PHP file.
+ *
+ * The PHP file is required and the $container variable can be
+ * used within the file to change the container.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class PhpFileLoader extends FileLoader
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function load($resource, $type = null)
+    {
+        // the container and loader variables are exposed to the included file below
+        $container = $this->container;
+        $loader = $this;
+
+        $path = $this->locator->locate($resource);
+        $this->setCurrentDir(dirname($path));
+        $this->container->addResource(new FileResource($path));
+
+        include $path;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supports($resource, $type = null)
+    {
+        return is_string($resource) && 'php' === pathinfo($resource, PATHINFO_EXTENSION);
+    }
+}