//===----------------------------------------------------------------------===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// // UNSUPPORTED: c++03, c++11, c++14, c++17 // // [[nodiscard]] constexpr bool empty() const noexcept; #include void test() { std::span s1; s1.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} int arr[] = {1, 2, 3}; std::span s2{arr}; s2.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} }