//                                     🟢 
    public function __construct(string $name, Node $body, Node $arguments, int $lineno)
    {
         // ...

        if (!$arguments instanceof ArrayExpression) {
             // ...
            
            //                       🟢 
            foreach ($arguments as $name => $default) { 
                $args->addElement($default, new LocalVariable($name, $default->getTemplateLine()));
            }

            // ...
        }

        // ...
        //                                                                            🟢 
        parent::__construct(['body' => $body, 'arguments' => $arguments], ['name' => $name], $lineno);
    }