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diff --git a/vendor/twig/twig/lib/Twig/NodeVisitorInterface.php b/vendor/twig/twig/lib/Twig/NodeVisitorInterface.php
new file mode 100644
index 000000000..092d36ae7
--- /dev/null
+++ b/vendor/twig/twig/lib/Twig/NodeVisitorInterface.php
@@ -0,0 +1,41 @@
+<?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.
+ */
+
+/**
+ * Twig_NodeVisitorInterface is the interface the all node visitor classes must implement.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface Twig_NodeVisitorInterface
+{
+    /**
+     * Called before child nodes are visited.
+     *
+     * @return Twig_NodeInterface The modified node
+     */
+    public function enterNode(Twig_NodeInterface $node, Twig_Environment $env);
+
+    /**
+     * Called after child nodes are visited.
+     *
+     * @return Twig_NodeInterface|false The modified node or false if the node must be removed
+     */
+    public function leaveNode(Twig_NodeInterface $node, Twig_Environment $env);
+
+    /**
+     * Returns the priority for this visitor.
+     *
+     * Priority should be between -10 and 10 (0 is the default).
+     *
+     * @return int The priority level
+     */
+    public function getPriority();
+}