{"ast_node_type":"variable","tokens":[{"end":89,"kind":"keyword","start":0,"text":"let"}]}
                let subpatterns = self.lower_tuple_subpats(args, expected_len, ellipsis);
                let expected_len = variant.unwrap().fields(self.db).fields().len();
                self.lower_variant_or_leaf(pat, ty, subpatterns)