{"ast_node_type":"variable","tokens":[{"end":26,"kind":"keyword","start":0,"text":"let"}]}
        let iter_binding =
            .alloc_expr(Expr::Loop { body: loop_inner, label: label.map(|it| it.1) }, syntax_ptr);
            self.alloc_binding(iter_name, BindingAnnotation::Mutable, HygieneId::ROOT);