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

vendor/symfony/dependency-injection/LazyProxy/PhpDumper/NullDumper.php

@@ -0,0 +1,46 @@
+<?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\LazyProxy\PhpDumper;
+
+use Symfony\Component\DependencyInjection\Definition;
+
+/**
+ * Null dumper, negates any proxy code generation for any given service definition.
+ *
+ * @author Marco Pivetta <ocramius@gmail.com>
+ */
+class NullDumper implements DumperInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function isProxyCandidate(Definition $definition)
+    {
+        return false;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getProxyFactoryCode(Definition $definition, $id)
+    {
+        return '';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getProxyCode(Definition $definition)
+    {
+        return '';
+    }
+}