{"ast_node_type":"variable","tokens":[{"end":78,"kind":"keyword","start":0,"text":"let"}]}
                            let ctor_vis = self.r.tcx.visibility(ctor_def_id);
                                Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id);
                            let field_visibilities = self