From 739357656d68e6bea35017c7f4683d438d391317 Mon Sep 17 00:00:00 2001
From: Nicolas Grekas <nicolas.grekas@gmail.com>
Date: Sat, 30 Nov 2019 13:15:01 +0100
Subject: [PATCH] [DI] fix overriding existing services with aliases for
 singly-implemented interfaces

---
 src/Symfony/Component/DependencyInjection/Loader/FileLoader.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
index a474613ef7bb0..a02c0653ece65 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
@@ -121,7 +121,7 @@ public function registerClasses(Definition $prototype, $namespace, $resource, $e
     public function registerAliasesForSinglyImplementedInterfaces()
     {
         foreach ($this->interfaces as $interface) {
-            if (!empty($this->singlyImplemented[$interface]) && !$this->container->hasAlias($interface)) {
+            if (!empty($this->singlyImplemented[$interface]) && !$this->container->has($interface)) {
                 $this->container->setAlias($interface, $this->singlyImplemented[$interface])->setPublic(false);
             }
         }