bug #34451 [DependencyInjection] Fix dumping multiple deprecated alia…

…ses (shyim)

This PR was merged into the 4.3 branch.

Discussion
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[DependencyInjection] Fix dumping multiple deprecated aliases

| Q             | A
| ------------- | ---
| Branch?       | 4.3
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       |
| License       | MIT
| Doc PR        |

Only the last deprecated alias wins, cause the content will not appended

Commits
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60b0dae [DependencyInjection] Fix dumping multiple deprecated aliases

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

@@ -1226,7 +1226,7 @@ private function addDeprecatedAliases(): string
             $methodNameAlias = $this->generateMethodName($alias);
             $idExported = $this->export($id);
             $messageExported = $this->export($definition->getDeprecationMessage($alias));
-            $code = <<<EOF
+            $code .= <<<EOF
 
     /*{$this->docStar}
      * Gets the $public '$alias' alias.

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

@@ -1283,6 +1283,30 @@ public function testWither()
         $wither = $container->get('wither');
         $this->assertInstanceOf(Foo::class, $wither->foo);
     }
+
+    /**
+     * @group legacy
+     * @expectedDeprecation The "deprecated1" service alias is deprecated. You should stop using it, as it will be removed in the future.
+     * @expectedDeprecation The "deprecated2" service alias is deprecated. You should stop using it, as it will be removed in the future.
+     */
+    public function testMultipleDeprecatedAliasesWorking()
+    {
+        $container = new ContainerBuilder();
+        $container->setDefinition('bar', new Definition('stdClass'))->setPublic(true);
+        $container->setAlias('deprecated1', 'bar')->setPublic(true)->setDeprecated('%alias_id% is deprecated');
+        $container->setAlias('deprecated2', 'bar')->setPublic(true)->setDeprecated('%alias_id% is deprecated');
+        $container->compile();
+
+        $dumper = new PhpDumper($container);
+        $dump = $dumper->dump(['class' => $class = __FUNCTION__]);
+
+        eval('?>'.$dump);
+        $container = new $class();
+
+        $this->assertInstanceOf(\stdClass::class, $container->get('bar'));
+        $this->assertInstanceOf(\stdClass::class, $container->get('deprecated1'));
+        $this->assertInstanceOf(\stdClass::class, $container->get('deprecated2'));
+    }
 }
 
 class Rot13EnvVarProcessor implements EnvVarProcessorInterface