/*
 * Copyright (c) 2025 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

type U1 = number[][] | string[]
type U2 = (readonly number[][]) | (readonly string[])

function main() {
    let v: U1 | U2 = [[1.0,2.0]]
    v[0] = [1.0,3.0]  // CTE, readonly array
}

/* @@? 21:5 Error TypeError: Cannot modify an array or tuple content that has the readonly parameter  */