$placeholder = new Node(ast\AST_ARRAY, 0, [
            new Node(ast\AST_ARRAY_ELEM, 0, ['key' => null, 'value' => $args[0]], 0),
            new Node(ast\AST_ARRAY_ELEM, 0, ['key' => null, 'value' => $args[1]], 0),
        ], 0);