{"ast_node_type":"variable","tokens":[{"end":42,"kind":"keyword","start":0,"text":"let"}]}
                            let ctor_res =
                        ctor.map(|(ctor_kind, ctor_def_id)| {
                                Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id);