[HttpKernel] Add #[AsController] attribute for declaring listeners on PHP 8

Author: nicolas-grekas

Attribute/AsController.php

@@ -0,0 +1,23 @@
+<?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\HttpKernel\Attribute;
+
+/**
+ * Service tag to autoconfigure controllers.
+ */
+#[\Attribute(\Attribute::TARGET_CLASS)]
+class AsController
+{
+    public function __construct()
+    {
+    }
+}

CHANGELOG.md

@@ -11,6 +11,7 @@ CHANGELOG
  * Deprecate returning a `ContainerBuilder` from `KernelInterface::registerContainerConfiguration()`
  * Deprecate `HttpKernelInterface::MASTER_REQUEST` and add `HttpKernelInterface::MAIN_REQUEST` as replacement
  * Deprecate `KernelEvent::isMasterRequest()` and add `isMainRequest()` as replacement
+ * Add `#[AsController]` attribute for declaring standalone controllers on PHP 8
 
 5.2.0
 -----