{"ast_node_type":"variable","tokens":[{"end":34,"kind":"keyword","start":0,"text":"let"}]}
                    let named_ty =
                RegionErrorKind::UnexpectedHiddenRegion { span, hidden_ty, key, member_region } => {
                        self.regioncx.name_regions_for_member_constraint(self.infcx.tcx, hidden_ty);