switched to namespace first, PSR-0 as a fallback

src/Node/NodeOutputInterface.php

@@ -1,11 +1,23 @@
 <?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\Node;
 
-class_exists('Twig_NodeOutputInterface');
-
-if (\false) {
-    interface NodeOutputInterface extends \Twig_NodeOutputInterface
-    {
-    }
+/**
+ * Represents a displayable node in the AST.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface NodeOutputInterface
+{
 }
+
+class_alias('Twig\Node\NodeOutputInterface', 'Twig_NodeOutputInterface');