{"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"is_alias_variant_ctor"}]}
                is_alias_variant_ctor = true;
                    Some(UserSelfTy { impl_def_id: adt_def.did(), self_ty: self_ty.raw });
                err_extend = GenericsArgsErrExtend::DefVariant(segments);