Add #[YieldReady] to allow extensions to tell when they're ready for yielding

src/Node/ForLoopNode.php

@@ -11,6 +11,7 @@
 
 namespace Twig\Node;
 
+use Twig\Attribute\YieldReady;
 use Twig\Compiler;
 
 /**
@@ -18,6 +19,7 @@ use Twig\Compiler;
  *
  * @author Fabien Potencier <fabien@symfony.com>
  */
+#[YieldReady]
 class ForLoopNode extends Node
 {
     public function __construct(int $lineno, ?string $tag = null)