Test service with factory is not tagged

src/Symfony/Component/DependencyInjection/Tests/Fixtures/BarFactory.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Symfony\Component\DependencyInjection\Tests\Fixtures;
+
+class BarFactory
+{
+    /**
+     * @var iterable
+     */
+    private $bars;
+
+    public function __construct(iterable $bars)
+    {
+        $this->bars = \iterator_to_array($bars);
+    }
+
+    public function getDefaultBar(): BarInterface
+    {
+        return reset($this->bars);
+    }
+}

src/Symfony/Component/DependencyInjection/Tests/Fixtures/yaml/service_instanceof_factory.yml

@@ -0,0 +1,14 @@
+services:
+    _instanceof:
+        Symfony\Component\DependencyInjection\Tests\Fixtures\BarInterface:
+            tags:
+                - { name: bar }
+
+    Symfony\Component\DependencyInjection\Tests\Fixtures\Bar:
+        public: true
+
+    Symfony\Component\DependencyInjection\Tests\Fixtures\BarFactory:
+        arguments: [!tagged 'bar']
+
+    Symfony\Component\DependencyInjection\Tests\Fixtures\BarInterface:
+        factory: ['@Symfony\Component\DependencyInjection\Tests\Fixtures\BarFactory', 'getDefaultBar']

src/Symfony/Component/DependencyInjection/Tests/Loader/YamlFileLoaderTest.php

@@ -770,4 +770,15 @@ class YamlFileLoaderTest extends TestCase
         $definition = $container->getDefinition('foo');
         $this->assertSame([['interface' => 'SomeInterface']], $definition->getTag('proxy'));
     }
+
+    public function testServiceWithSameNameAsInterfaceAndFactoryIsNotTagged()
+    {
+        $container = new ContainerBuilder();
+        $loader = new YamlFileLoader($container, new FileLocator(self::$fixturesPath.'/yaml'));
+        $loader->load('service_instanceof_factory.yml');
+        $container->compile();
+
+        $tagged = $container->findTaggedServiceIds('bar');
+        $this->assertCount(1, $tagged);
+    }
 }