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diff --git a/vendor/twig/twig/lib/Twig/Node/Expression/BlockReference.php b/vendor/twig/twig/lib/Twig/Node/Expression/BlockReference.php
new file mode 100644
index 000000000..056d99185
--- /dev/null
+++ b/vendor/twig/twig/lib/Twig/Node/Expression/BlockReference.php
@@ -0,0 +1,91 @@
+<?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.
+ */
+
+/**
+ * Represents a block call node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_BlockReference extends Twig_Node_Expression
+{
+    /**
+     * @param Twig_Node|null $template
+     */
+    public function __construct(Twig_NodeInterface $name, $template = null, $lineno, $tag = null)
+    {
+        if (is_bool($template)) {
+            @trigger_error(sprintf('The %s method "$asString" argument is deprecated since version 1.28 and will be removed in 2.0.', __METHOD__), E_USER_DEPRECATED);
+
+            $template = null;
+        }
+
+        $nodes = array('name' => $name);
+        if (null !== $template) {
+            $nodes['template'] = $template;
+        }
+
+        parent::__construct($nodes, array('is_defined_test' => false, 'output' => false), $lineno, $tag);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        if ($this->getAttribute('is_defined_test')) {
+            $this->compileTemplateCall($compiler, 'hasBlock');
+        } else {
+            if ($this->getAttribute('output')) {
+                $compiler->addDebugInfo($this);
+
+                $this
+                    ->compileTemplateCall($compiler, 'displayBlock')
+                    ->raw(";\n");
+            } else {
+                $this->compileTemplateCall($compiler, 'renderBlock');
+            }
+        }
+    }
+
+    private function compileTemplateCall(Twig_Compiler $compiler, $method)
+    {
+        if (!$this->hasNode('template')) {
+            $compiler->write('$this');
+        } else {
+            $compiler
+                ->write('$this->loadTemplate(')
+                ->subcompile($this->getNode('template'))
+                ->raw(', ')
+                ->repr($this->getTemplateName())
+                ->raw(', ')
+                ->repr($this->getTemplateLine())
+                ->raw(')')
+            ;
+        }
+
+        $compiler->raw(sprintf('->%s', $method));
+        $this->compileBlockArguments($compiler);
+
+        return $compiler;
+    }
+
+    private function compileBlockArguments(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(')
+            ->subcompile($this->getNode('name'))
+            ->raw(', $context');
+
+        if (!$this->hasNode('template')) {
+            $compiler->raw(', $blocks');
+        }
+
+        return $compiler->raw(')');
+    }
+}