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diff --git a/vendor/symfony/dependency-injection/Compiler/ServiceReferenceGraphNode.php b/vendor/symfony/dependency-injection/Compiler/ServiceReferenceGraphNode.php
new file mode 100644
index 000000000..e5718b2b6
--- /dev/null
+++ b/vendor/symfony/dependency-injection/Compiler/ServiceReferenceGraphNode.php
@@ -0,0 +1,120 @@
+<?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\Compiler;
+
+use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Alias;
+
+/**
+ * Represents a node in your service graph.
+ *
+ * Value is typically a definition, or an alias.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class ServiceReferenceGraphNode
+{
+    private $id;
+    private $inEdges = array();
+    private $outEdges = array();
+    private $value;
+
+    /**
+     * @param string $id    The node identifier
+     * @param mixed  $value The node value
+     */
+    public function __construct($id, $value)
+    {
+        $this->id = $id;
+        $this->value = $value;
+    }
+
+    /**
+     * Adds an in edge to this node.
+     *
+     * @param ServiceReferenceGraphEdge $edge
+     */
+    public function addInEdge(ServiceReferenceGraphEdge $edge)
+    {
+        $this->inEdges[] = $edge;
+    }
+
+    /**
+     * Adds an out edge to this node.
+     *
+     * @param ServiceReferenceGraphEdge $edge
+     */
+    public function addOutEdge(ServiceReferenceGraphEdge $edge)
+    {
+        $this->outEdges[] = $edge;
+    }
+
+    /**
+     * Checks if the value of this node is an Alias.
+     *
+     * @return bool True if the value is an Alias instance
+     */
+    public function isAlias()
+    {
+        return $this->value instanceof Alias;
+    }
+
+    /**
+     * Checks if the value of this node is a Definition.
+     *
+     * @return bool True if the value is a Definition instance
+     */
+    public function isDefinition()
+    {
+        return $this->value instanceof Definition;
+    }
+
+    /**
+     * Returns the identifier.
+     *
+     * @return string
+     */
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    /**
+     * Returns the in edges.
+     *
+     * @return array The in ServiceReferenceGraphEdge array
+     */
+    public function getInEdges()
+    {
+        return $this->inEdges;
+    }
+
+    /**
+     * Returns the out edges.
+     *
+     * @return array The out ServiceReferenceGraphEdge array
+     */
+    public function getOutEdges()
+    {
+        return $this->outEdges;
+    }
+
+    /**
+     * Returns the value of this Node.
+     *
+     * @return mixed The value
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+}