--- /dev/null
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Extension;
+
+/**
+ * @author Grégoire Pineau <lyrixx@lyrixx.info>
+ */
+interface RuntimeExtensionInterface
+{
+}