{"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
                let def_id = tcx.generics_of(self.mir_def_id()).region_param(ebr, tcx).def_id;
            ty::ReEarlyParam(ebr) => ebr.is_named().then(|| {
                let span = tcx.hir_span_if_local(def_id).unwrap_or(DUMMY_SP);