diff -r 000000000000 -r 7f95f8617b0b vendor/symfony/src/Symfony/Component/DependencyInjection/Compiler/ResolveReferencesToAliasesPass.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/symfony/src/Symfony/Component/DependencyInjection/Compiler/ResolveReferencesToAliasesPass.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,91 @@
+<?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\Alias;
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+/**
+ * Replaces all references to aliases with references to the actual service.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class ResolveReferencesToAliasesPass implements CompilerPassInterface
+{
+    private $container;
+
+    /**
+     * Processes the ContainerBuilder to replace references to aliases with actual service references.
+     *
+     * @param ContainerBuilder $container
+     */
+    public function process(ContainerBuilder $container)
+    {
+        $this->container = $container;
+
+        foreach ($container->getDefinitions() as $definition) {
+            if ($definition->isSynthetic() || $definition->isAbstract()) {
+                continue;
+            }
+
+            $definition->setArguments($this->processArguments($definition->getArguments()));
+            $definition->setMethodCalls($this->processArguments($definition->getMethodCalls()));
+            $definition->setProperties($this->processArguments($definition->getProperties()));
+        }
+
+        foreach ($container->getAliases() as $id => $alias) {
+            $aliasId = (string) $alias;
+            if ($aliasId !== $defId = $this->getDefinitionId($aliasId)) {
+                $container->setAlias($id, new Alias($defId, $alias->isPublic()));
+            }
+        }
+    }
+
+    /**
+     * Processes the arguments to replace aliases
+     *
+     * @param array $arguments An array of References
+     * @return array An array of References
+     */
+    private function processArguments(array $arguments)
+    {
+        foreach ($arguments as $k => $argument) {
+            if (is_array($argument)) {
+                $arguments[$k] = $this->processArguments($argument);
+            } elseif ($argument instanceof Reference) {
+                $defId = $this->getDefinitionId($id = (string) $argument);
+
+                if ($defId !== $id) {
+                    $arguments[$k] = new Reference($defId, $argument->getInvalidBehavior(), $argument->isStrict());
+                }
+            }
+        }
+
+        return $arguments;
+    }
+
+    /**
+     * Resolve an alias into a definition id
+     *
+     * @param string $id The definition or alias id to resolve
+     * @return string The definition id with aliases resolved
+     */
+    private function getDefinitionId($id)
+    {
+        while ($this->container->hasAlias($id)) {
+            $id = (string) $this->container->getAlias($id);
+        }
+
+        return $id;
+    }
+}