text: //===----------------------------------------------------------------------===//
  //
  // 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: libcpp-has-no-threads
  // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
  // REQUIRES: verify-support
  
  // <future>
  
  // template <class F, class... Args>
  //     future<typename result_of<F(Args...)>::type>
  //     async(F&& f, Args&&... args);
  
  // template <class F, class... Args>
  //     future<typename result_of<F(Args...)>::type>
  //     async(launch policy, F&& f, Args&&... args);
  
  
  #include <future>
  #include <atomic>
  #include <memory>
  #include <cassert>
  
  #include "test_macros.h"
  
  int foo (int x) { return x; }
  
  int main(int, char**)
  {
      std::async(                    foo, 3); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
      std::async(std::launch::async, foo, 3); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
  
      return 0;
  }
  