diff -r 000000000000 -r 7f95f8617b0b vendor/symfony/src/Symfony/Component/DependencyInjection/Compiler/RemoveUnusedDefinitionsPass.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/symfony/src/Symfony/Component/DependencyInjection/Compiler/RemoveUnusedDefinitionsPass.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,88 @@
+<?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\Definition;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+/**
+ * Removes unused service definitions from the container.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class RemoveUnusedDefinitionsPass implements RepeatablePassInterface
+{
+    private $repeatedPass;
+
+    /**
+     * {@inheritDoc}
+     */
+    public function setRepeatedPass(RepeatedPass $repeatedPass)
+    {
+        $this->repeatedPass = $repeatedPass;
+    }
+
+    /**
+     * Processes the ContainerBuilder to remove unused definitions.
+     *
+     * @param ContainerBuilder $container
+     * @return void
+     */
+    public function process(ContainerBuilder $container)
+    {
+        $compiler = $container->getCompiler();
+        $formatter = $compiler->getLoggingFormatter();
+        $graph = $compiler->getServiceReferenceGraph();
+
+        $hasChanged = false;
+        foreach ($container->getDefinitions() as $id => $definition) {
+            if ($definition->isPublic()) {
+                continue;
+            }
+
+            if ($graph->hasNode($id)) {
+                $edges = $graph->getNode($id)->getInEdges();
+                $referencingAliases = array();
+                $sourceIds = array();
+                foreach ($edges as $edge) {
+                    $node = $edge->getSourceNode();
+                    $sourceIds[] = $node->getId();
+
+                    if ($node->isAlias()) {
+                        $referencingAlias[] = $node->getValue();
+                    }
+                }
+                $isReferenced = (count(array_unique($sourceIds)) - count($referencingAliases)) > 0;
+            } else {
+                $referencingAliases = array();
+                $isReferenced = false;
+            }
+
+            if (1 === count($referencingAliases) && false === $isReferenced) {
+                $container->setDefinition((string) reset($referencingAliases), $definition);
+                $definition->setPublic(true);
+                $container->removeDefinition($id);
+                $compiler->addLogMessage($formatter->formatRemoveService($this, $id, 'replaces alias '.reset($referencingAliases)));
+            } else if (0 === count($referencingAliases) && false === $isReferenced) {
+                $container->removeDefinition($id);
+                $compiler->addLogMessage($formatter->formatRemoveService($this, $id, 'unused'));
+                $hasChanged = true;
+            }
+        }
+
+        if ($hasChanged) {
+            $this->repeatedPass->setRepeat();
+        }
+    }
+}