{"ast_node_type":"variable","tokens":[{"end":99,"kind":"keyword","start":0,"text":"let"}]}
                    let Some(ty::Bivariant | ty::Contravariant) = self.variances.get(def_id) else {
                uncaptured_args.retain(|&(def_id, kind)| {
                        // Keep all covariant/invariant args. Also if variance is `None`,