[EventDispatcher] Deprecate LegacyEventDispatcherProxy.

Author: derrabus

CHANGELOG.md

@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+5.1.0
+-----
+
+ * The `LegacyEventDispatcherProxy` class has been deprecated.
+
 5.0.0
 -----
 

LegacyEventDispatcherProxy.php

@@ -13,12 +13,14 @@
 
 use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
+@trigger_error(sprintf('%s is deprecated since Symfony 5.1, use the event dispatcher without the proxy.', LegacyEventDispatcherProxy::class), E_USER_DEPRECATED);
+
 /**
  * A helper class to provide BC/FC with the legacy signature of EventDispatcherInterface::dispatch().
  *
- * This class should be deprecated in Symfony 5.1
- *
  * @author Nicolas Grekas <[email protected]>
+ *
+ * @deprecated since Symfony 5.1.
  */
 final class LegacyEventDispatcherProxy
 {