Rename twig to Twig to get it working.

resources/templates/engine/Twig/ParserInterface.php

@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interface implemented by parser classes.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_ParserInterface
+{
+    /**
+     * Converts a token stream to a node tree.
+     *
+     * @param Twig_TokenStream $stream A token stream instance
+     *
+     * @return Twig_Node_Module A node tree
+     *
+     * @throws Twig_Error_Syntax When the token stream is syntactically or semantically wrong
+     */
+    public function parse(Twig_TokenStream $stream);
+}