[DI] Fix YamlDumper not dumping abstract and autoconfigure

src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php

@@ -116,6 +116,14 @@ class YamlDumper extends Dumper
             $code .= sprintf("        autowiring_types:\n%s", $autowiringTypesCode);
         }
 
+        if ($definition->isAutoconfigured()) {
+            $code .= "        autoconfigure: true\n";
+        }
+
+        if ($definition->isAbstract()) {
+            $code .= "        abstract: true\n";
+        }
+
         if ($definition->isLazy()) {
             $code .= "        lazy: true\n";
         }

src/Symfony/Component/DependencyInjection/Tests/Dumper/YamlDumperTest.php

@@ -12,8 +12,10 @@
 namespace Symfony\Component\DependencyInjection\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Dumper\YamlDumper;
+use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 use Symfony\Component\Yaml\Yaml;
 use Symfony\Component\Yaml\Parser;
 
@@ -64,6 +66,16 @@ class YamlDumperTest extends TestCase
         $this->assertStringEqualsFile(self::$fixturesPath.'/yaml/services24.yml', $dumper->dump());
     }
 
+    public function testDumpLoad()
+    {
+        $container = new ContainerBuilder();
+        $loader = new YamlFileLoader($container, new FileLocator(self::$fixturesPath.'/yaml'));
+        $loader->load('services_dump_load.yml');
+
+        $dumper = new YamlDumper($container);
+        $this->assertStringEqualsFile(self::$fixturesPath.'/yaml/services_dump_load.yml', $dumper->dump());
+    }
+
     private function assertEqualYamlStructure($expected, $yaml, $message = '')
     {
         $parser = new Parser();

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

@@ -0,0 +1,14 @@
+
+services:
+    service_container:
+        class: Symfony\Component\DependencyInjection\ContainerInterface
+        synthetic: true
+    foo:
+        autoconfigure: true
+        abstract: true
+    Psr\Container\ContainerInterface:
+        alias: service_container
+        public: false
+    Symfony\Component\DependencyInjection\ContainerInterface:
+        alias: service_container
+        public: false