{"ast_node_type":"variable","tokens":[{"end":83,"kind":"keyword","start":0,"text":"let"}]}
            let mut covered_by: Vec<_> = self.covered_by.iter().copied().collect();
            #[cfg_attr(feature = "rustc", allow(rustc::potential_query_instability))]
            covered_by.sort_by_key(|pat| pat.uid); // sort to avoid instability