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diff --git a/vendor/symfony/config/Definition/Builder/VariableNodeDefinition.php b/vendor/symfony/config/Definition/Builder/VariableNodeDefinition.php
new file mode 100644
index 000000000..a46b7ea61
--- /dev/null
+++ b/vendor/symfony/config/Definition/Builder/VariableNodeDefinition.php
@@ -0,0 +1,64 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Config\Definition\Builder;
+
+use Symfony\Component\Config\Definition\VariableNode;
+
+/**
+ * This class provides a fluent interface for defining a node.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class VariableNodeDefinition extends NodeDefinition
+{
+    /**
+     * Instantiate a Node.
+     *
+     * @return VariableNode The node
+     */
+    protected function instantiateNode()
+    {
+        return new VariableNode($this->name, $this->parent);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function createNode()
+    {
+        $node = $this->instantiateNode();
+
+        if (null !== $this->normalization) {
+            $node->setNormalizationClosures($this->normalization->before);
+        }
+
+        if (null !== $this->merge) {
+            $node->setAllowOverwrite($this->merge->allowOverwrite);
+        }
+
+        if (true === $this->default) {
+            $node->setDefaultValue($this->defaultValue);
+        }
+
+        $node->setAllowEmptyValue($this->allowEmptyValue);
+        $node->addEquivalentValue(null, $this->nullEquivalent);
+        $node->addEquivalentValue(true, $this->trueEquivalent);
+        $node->addEquivalentValue(false, $this->falseEquivalent);
+        $node->setRequired($this->required);
+
+        if (null !== $this->validation) {
+            $node->setFinalValidationClosures($this->validation->rules);
+        }
+
+        return $node;
+    }
+}