{"ast_node_type":"variable","tokens":[{"end":82,"kind":"keyword","start":0,"text":"let"}]}
                let upvars_map = self.infcx.tcx.upvars_mentioned(def_id).unwrap();
            if let Some(def_hir) = defined_hir {
                let upvar_def_span = self.infcx.tcx.hir_span(def_hir);