{"ast_node_type":"variable","tokens":[{"end":83,"kind":"keyword","start":0,"text":"let"}]}
                let expected_len = variant.unwrap().fields(self.db).fields().len();
            hir_def::hir::Pat::TupleStruct { ref args, ellipsis, .. } if variant.is_some() => {
                let subpatterns = self.lower_tuple_subpats(args, expected_len, ellipsis);