switched to namespace first, PSR-0 as a fallback

src/Node/BlockReferenceNode.php

@@ -1,11 +1,38 @@
 <?php
 
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ * (c) Armin Ronacher
+ *
+ * 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_Node_BlockReference');
+use Twig\Compiler;
 
-if (\false) {
-    class BlockReferenceNode extends \Twig_Node_BlockReference
+/**
+ * Represents a block call node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class BlockReferenceNode extends Node implements NodeOutputInterface
+{
+    public function __construct($name, $lineno, $tag = null)
     {
+        parent::__construct([], ['name' => $name], $lineno, $tag);
+    }
+
+    public function compile(Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write(sprintf("\$this->displayBlock('%s', \$context, \$blocks);\n", $this->getAttribute('name')))
+        ;
     }
 }
+
+class_alias('Twig\Node\BlockReferenceNode', 'Twig_Node_BlockReference');