Enable "native_constant_invocation" CS rule

Author: nicolas-grekas

ContainerAwareEventDispatcher.php

@@ -47,7 +47,7 @@ public function __construct(ContainerInterface $container)
             $class = get_parent_class($class);
         }
         if (__CLASS__ !== $class) {
-            @trigger_error(sprintf('The %s class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.', __CLASS__), E_USER_DEPRECATED);
+            @trigger_error(sprintf('The %s class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.', __CLASS__), \E_USER_DEPRECATED);
         }
     }
 
@@ -65,7 +65,7 @@ public function __construct(ContainerInterface $container)
      */
     public function addListenerService($eventName, $callback, $priority = 0)
     {
-        @trigger_error(sprintf('The %s class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.', __CLASS__), E_USER_DEPRECATED);
+        @trigger_error(sprintf('The %s class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.', __CLASS__), \E_USER_DEPRECATED);
 
         if (!\is_array($callback) || 2 !== \count($callback)) {
             throw new \InvalidArgumentException('Expected an ["service", "method"] argument.');
@@ -147,7 +147,7 @@ public function getListenerPriority($eventName, $listener)
      */
     public function addSubscriberService($serviceId, $class)
     {
-        @trigger_error(sprintf('The %s class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.', __CLASS__), E_USER_DEPRECATED);
+        @trigger_error(sprintf('The %s class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.', __CLASS__), \E_USER_DEPRECATED);
 
         foreach ($class::getSubscribedEvents() as $eventName => $params) {
             if (\is_string($params)) {
@@ -164,7 +164,7 @@ public function addSubscriberService($serviceId, $class)
 
     public function getContainer()
     {
-        @trigger_error('The '.__METHOD__.'() method is deprecated since Symfony 3.3 as its class will be removed in 4.0. Inject the container or the services you need in your listeners/subscribers instead.', E_USER_DEPRECATED);
+        @trigger_error('The '.__METHOD__.'() method is deprecated since Symfony 3.3 as its class will be removed in 4.0. Inject the container or the services you need in your listeners/subscribers instead.', \E_USER_DEPRECATED);
 
         return $this->container;
     }