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diff --git a/vendor/symfony/config/Definition/Builder/ValidationBuilder.php b/vendor/symfony/config/Definition/Builder/ValidationBuilder.php
new file mode 100644
index 000000000..12aa59a4f
--- /dev/null
+++ b/vendor/symfony/config/Definition/Builder/ValidationBuilder.php
@@ -0,0 +1,51 @@
+<?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;
+
+/**
+ * This class builds validation conditions.
+ *
+ * @author Christophe Coevoet <stof@notk.org>
+ */
+class ValidationBuilder
+{
+    protected $node;
+    public $rules = array();
+
+    /**
+     * Constructor.
+     *
+     * @param NodeDefinition $node The related node
+     */
+    public function __construct(NodeDefinition $node)
+    {
+        $this->node = $node;
+    }
+
+    /**
+     * Registers a closure to run as normalization or an expression builder to build it if null is provided.
+     *
+     * @param \Closure $closure
+     *
+     * @return ExprBuilder|$this
+     */
+    public function rule(\Closure $closure = null)
+    {
+        if (null !== $closure) {
+            $this->rules[] = $closure;
+
+            return $this;
+        }
+
+        return $this->rules[] = new ExprBuilder($this->node);
+    }
+}