From 14c65e38146ad41abc18281c8ad103a869d825c7 Mon Sep 17 00:00:00 2001
From: Nicolas Grekas <nicolas.grekas@gmail.com>
Date: Sat, 17 Dec 2016 10:57:46 +0100
Subject: [PATCH] [DI] Fix DefinitionDecorator deprecation layer

---
 src/Symfony/Component/DependencyInjection/ChildDefinition.php | 2 ++
 .../Component/DependencyInjection/DefinitionDecorator.php     | 4 +---
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/Symfony/Component/DependencyInjection/ChildDefinition.php b/src/Symfony/Component/DependencyInjection/ChildDefinition.php
index f10bcddfc04e4..53a1d188a0e90 100644
--- a/src/Symfony/Component/DependencyInjection/ChildDefinition.php
+++ b/src/Symfony/Component/DependencyInjection/ChildDefinition.php
@@ -14,6 +14,8 @@
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Exception\OutOfBoundsException;
 
+class_alias(ChildDefinition::class, DefinitionDecorator::class);
+
 /**
  * This definition extends another definition.
  *
diff --git a/src/Symfony/Component/DependencyInjection/DefinitionDecorator.php b/src/Symfony/Component/DependencyInjection/DefinitionDecorator.php
index 00e31ff3d0969..9fa67439b91e8 100644
--- a/src/Symfony/Component/DependencyInjection/DefinitionDecorator.php
+++ b/src/Symfony/Component/DependencyInjection/DefinitionDecorator.php
@@ -20,6 +20,4 @@
  *
  * @deprecated The DefinitionDecorator class is deprecated since version 3.3 and will be removed in 4.0. Use the Symfony\Component\DependencyInjection\ChildDefinition class instead.
  */
-class DefinitionDecorator extends ChildDefinition
-{
-}
+class_exists(ChildDefinition::class);