Issue #3032605 by mikelutz, Gábor Hojtsy, longwave, martin107: [symfony 4]...

Issue #3032605 by mikelutz, Gábor Hojtsy, longwave, martin107: [symfony 4] Drupal\Component\DependencyInjection\Container should implement Symfony\Contracts\Service\ResetInterface

core/lib/Drupal/Component/DependencyInjection/Container.php

@@ -9,6 +9,7 @@
 use Symfony\Component\DependencyInjection\Exception\ParameterNotFoundException;
 use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
 use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
+use Symfony\Contracts\Service\ResetInterface;
 
 /**
  * Provides a container optimized for Drupal's needs.
@@ -41,12 +42,9 @@
  * - The function getServiceIds() was added as it has a use-case in core and
  *   contrib.
  *
- * @todo Implement Symfony\Contracts\Service\ResetInterface once Symfony 4
- *   is being used. See https://www.drupal.org/project/drupal/issues/3032605
- *
  * @ingroup container
  */
-class Container implements ContainerInterface {
+class Container implements ContainerInterface, ResetInterface {
 
   /**
    * The parameters of the container.

core/lib/Drupal/Component/DependencyInjection/composer.json

@@ -12,7 +12,8 @@
   },
   "require": {
     "php": ">=7.3.0",
-    "symfony/dependency-injection": "^4.4"
+    "symfony/dependency-injection": "^4.4",
+    "symfony/service-contracts": "^1.1|^2"
   },
   "suggest": {
     "symfony/expression-language": "For using expressions in service container configuration"