diff -r 6d109e3804ac -r 9a001a04b634 Twig-1.3.0/lib/Twig/Node/Expression/Name.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Twig-1.3.0/lib/Twig/Node/Expression/Name.php	Tue Oct 25 23:56:28 2011 +0200
@@ -0,0 +1,58 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Name extends Twig_Node_Expression
+{
+    public function __construct($name, $lineno)
+    {
+        parent::__construct(array(), array('name' => $name, 'output' => false), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        static $specialVars = array(
+            '_self'    => '$this',
+            '_context' => '$context',
+            '_charset' => '$this->env->getCharset()',
+        );
+
+        $name = $this->getAttribute('name');
+
+        if ($this->hasAttribute('is_defined_test')) {
+            if (isset($specialVars[$name])) {
+                $compiler->repr(true);
+            } else {
+                $compiler->raw('array_key_exists(')->repr($name)->raw(', $context)');
+            }
+        } elseif (isset($specialVars[$name])) {
+            $compiler->raw($specialVars[$name]);
+        } elseif ($this->getAttribute('output')) {
+            $compiler
+                ->addDebugInfo($this)
+                ->write('if (isset($context[')
+                ->string($name)
+                ->raw("])) {\n")
+                ->indent()
+                ->write('echo $context[')
+                ->string($name)
+                ->raw("];\n")
+                ->outdent()
+                ->write("}\n")
+            ;
+        } else {
+            $compiler
+                ->raw('$this->getContext($context, ')
+                ->string($name)
+                ->raw(')')
+            ;
+        }
+    }
+}