{"ast_node_type":"variable","tokens":[{"end":91,"kind":"keyword","start":0,"text":"let"}]}
                let rhs_ty = rhs.map(|e| self.infer_expr(e, &rhs_expect, ExprIsRead::Yes));
                    .map_or_else(Expectation::none, |ty| Expectation::has_type(ty.clone()));
                match (range_type, lhs_ty, rhs_ty) {