{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
        let mut ops: SmallVec<[KleeneToken; 1]> = ops.cloned().collect();
    fn from(ops: &Stack<'_, KleeneToken>) -> SmallVec<[KleeneToken; 1]> {
        // The stack is innermost on top. We want outermost first.