1 // RUN: %clang_cc1 -verify -std=c++20 -fsyntax-only %s
2 
3 #include "Inputs/std-coroutine.h"
4 
5 namespace std::experimental {
6 using std::coroutine_handle;
7 using std::coroutine_traits; // expected-note{{declared here}}
8 } // namespace std::experimental
9 
10 struct my_awaitable {
11   bool await_ready() noexcept;
12   void await_suspend(std::coroutine_handle<> coro) noexcept;
13   void await_resume() noexcept;
14 };
15 
16 struct promise_void {
17   void get_return_object();
18   my_awaitable initial_suspend();
19   my_awaitable final_suspend() noexcept;
20   void return_void();
21   void unhandled_exception();
22 };
23 
24 template <>
25 struct std::coroutine_traits<void> { using promise_type = promise_void; };
26 
test()27 void test() {
28   co_return;
29   // expected-warning@-1{{support for std::experimental::coroutine_traits will be removed}}
30 }
31