Update

trunk/_vendor/symfony/assetic-bundle/DependencyInjection/Compiler/TemplatingPass.php

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+<?php
+
+/*
+ * This file is part of the Symfony framework.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace Symfony\Bundle\AsseticBundle\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+/**
+ * This pass removes services associated with unused templating engines.
+ *
+ * @author Kris Wallsmith <kris@symfony.com>
+ */
+class TemplatingPass implements CompilerPassInterface
+{
+    public function process(ContainerBuilder $container)
+    {
+        if (!$container->hasDefinition('assetic.asset_manager')) {
+            return;
+        }
+
+        $engines = $container->getParameterBag()->resolveValue($container->getParameter('templating.engines'));
+
+        if (!in_array('twig', $engines)) {
+            foreach ($container->findTaggedServiceIds('assetic.templating.twig') as $id => $attr) {
+                $container->removeDefinition($id);
+            }
+        }
+
+        if (!in_array('php', $engines)) {
+            foreach ($container->findTaggedServiceIds('assetic.templating.php') as $id => $attr) {
+                $container->removeDefinition($id);
+            }
+        }
+    }
+}