{"ast_node_type":"variable","tokens":[{"end":72,"kind":"keyword","start":0,"text":"let"}]}
                let upvar_span = upvars_map.get(&def_hir).unwrap().span;
                let upvar_def_span = self.infcx.tcx.hir_span(def_hir);
                diag.subdiagnostic(VarHereDenote::Defined { span: upvar_def_span });