{"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
        let all_unstable = constraints.iter().all(|&(_, _, stable)| !stable.is_empty());
        let all_stable = constraints.iter().all(|&(_, _, stable)| stable.is_empty());
        let post = if all_stable || all_unstable {