Issue #3236243 by daffie, longwave, alexpott: [Symfony 6] Add "callable|false"...

Issue #3236243 by daffie, longwave, alexpott: [Symfony 6] Add "callable|false" type hint to methods overriding Symfony\Component\HttpKernel\Controller\ControllerResolverInterface::getController()

core/lib/Drupal/Core/Controller/ControllerResolver.php

@@ -78,7 +78,7 @@ public function getControllerFromDefinition($controller, $path = '') {
   /**
    * {@inheritdoc}
    */
-  public function getController(Request $request) {
+  public function getController(Request $request): callable|FALSE {
     if (!$controller = $request->attributes->get('_controller')) {
       return FALSE;
     }