Issue #3231669 by daffie: [Symfony 6] Add "Alias" type hint to...

Issue #3231669 by daffie: [Symfony 6] Add "Alias" type hint to Drupal\Core\DependencyInjection\ContainerBuilder::setAlias()

core/lib/Drupal/Core/DependencyInjection/ContainerBuilder.php

@@ -5,6 +5,7 @@
 
 namespace Drupal\Core\DependencyInjection;
 
+use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\DependencyInjection\ContainerBuilder as SymfonyContainerBuilder;
 use Symfony\Component\DependencyInjection\Container as SymfonyContainer;
 use Symfony\Component\DependencyInjection\Definition;
@@ -100,7 +101,7 @@ public function register($id, $class = null): Definition {
   /**
    * {@inheritdoc}
    */
-  public function setAlias($alias, $id) {
+  public function setAlias($alias, $id): Alias {
     $alias = parent::setAlias($alias, $id);
     // As of Symfony 3.4 all aliases are private by default.
     $alias->setPublic(TRUE);