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diff --git a/vendor/symfony/dependency-injection/Compiler/ExtensionCompilerPass.php b/vendor/symfony/dependency-injection/Compiler/ExtensionCompilerPass.php
new file mode 100644
index 000000000..27e504824
--- /dev/null
+++ b/vendor/symfony/dependency-injection/Compiler/ExtensionCompilerPass.php
@@ -0,0 +1,37 @@
+<?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\ContainerBuilder;
+
+/**
+ * A pass to automatically process extensions if they implement
+ * CompilerPassInterface.
+ *
+ * @author Wouter J <wouter@wouterj.nl>
+ */
+class ExtensionCompilerPass implements CompilerPassInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function process(ContainerBuilder $container)
+    {
+        foreach ($container->getExtensions() as $extension) {
+            if (!$extension instanceof CompilerPassInterface) {
+                continue;
+            }
+
+            $extension->process($container);
+        }
+    }
+}