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diff --git a/vendor/symfony/dependency-injection/Loader/Configurator/ReferenceConfigurator.php b/vendor/symfony/dependency-injection/Loader/Configurator/ReferenceConfigurator.php
new file mode 100644
index 000000000..1585c0872
--- /dev/null
+++ b/vendor/symfony/dependency-injection/Loader/Configurator/ReferenceConfigurator.php
@@ -0,0 +1,66 @@
+<?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\DependencyInjection\Loader\Configurator;
+
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class ReferenceConfigurator extends AbstractConfigurator
+{
+    /** @internal */
+    protected $id;
+
+    /** @internal */
+    protected $invalidBehavior = ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE;
+
+    public function __construct($id)
+    {
+        $this->id = $id;
+    }
+
+    /**
+     * @return $this
+     */
+    final public function ignoreOnInvalid()
+    {
+        $this->invalidBehavior = ContainerInterface::IGNORE_ON_INVALID_REFERENCE;
+
+        return $this;
+    }
+
+    /**
+     * @return $this
+     */
+    final public function nullOnInvalid()
+    {
+        $this->invalidBehavior = ContainerInterface::NULL_ON_INVALID_REFERENCE;
+
+        return $this;
+    }
+
+    /**
+     * @return $this
+     */
+    final public function ignoreOnUninitialized()
+    {
+        $this->invalidBehavior = ContainerInterface::IGNORE_ON_UNINITIALIZED_REFERENCE;
+
+        return $this;
+    }
+
+    public function __toString()
+    {
+        return $this->id;
+    }
+}