1e356f681SHui Xie //===----------------------------------------------------------------------===// 2*6a54dfbfSLouis Dionne // 3e356f681SHui Xie // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4e356f681SHui Xie // See https://llvm.org/LICENSE.txt for license information. 5e356f681SHui Xie // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6e356f681SHui Xie // 7e356f681SHui Xie //===----------------------------------------------------------------------===// 8e356f681SHui Xie 9e356f681SHui Xie // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20 10e356f681SHui Xie 11e356f681SHui Xie // constexpr unexpected& operator=(const unexpected&) = default; 12e356f681SHui Xie 13e356f681SHui Xie #include <cassert> 14e356f681SHui Xie #include <expected> 15e356f681SHui Xie 16e356f681SHui Xie struct Error { 17e356f681SHui Xie int i; 18e356f681SHui Xie constexpr Error(int ii) : i(ii) {} 19e356f681SHui Xie }; 20e356f681SHui Xie 21e356f681SHui Xie constexpr bool test() { 22e356f681SHui Xie std::unexpected<Error> unex1(4); 23e356f681SHui Xie const std::unexpected<Error> unex2(5); 24e356f681SHui Xie unex1 = unex2; 25e356f681SHui Xie assert(unex1.error().i == 5); 26e356f681SHui Xie return true; 27e356f681SHui Xie } 28e356f681SHui Xie 29e356f681SHui Xie int main(int, char**) { 30e356f681SHui Xie test(); 31e356f681SHui Xie static_assert(test()); 32e356f681SHui Xie return 0; 33e356f681SHui Xie } 34