{"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
            let mut query_keys_and_indices = Vec::new();
            // `(query_key, dep_node_index)` pairs and release the lock again.
            query_cache.iter(&mut |k, _, i| query_keys_and_indices.push((*k, i)));