clang/test/SemaCXX/coroutine-mixed-exp-namespace.cpp

   1 // This file is to test the mixed use of `std::experimental::coroutine*` and `std::coroutine*`
   2 // wouldn't make the compiler to crash and emit the diagnostic message correctly.
   3 // RUN: %clang_cc1 -verify -std=c++20 -fsyntax-only %s
   4
   5 #include "Inputs/std-coroutine-exp-namespace.h"
   6 #include "Inputs/std-coroutine.h" // Second
   7
   8 struct my_awaitable {
   9   bool await_ready() noexcept;
  10   void await_suspend(std::experimental::coroutine_handle<> coro) noexcept;
  11   void await_resume() noexcept;
  12 };
  13
  14 struct promise_void {
  15   void get_return_object();
  16   my_awaitable initial_suspend();
  17   my_awaitable final_suspend() noexcept;
  18   void return_void();
  19   void unhandled_exception();
  20 };
  21
  22 template <>
  23 struct std::coroutine_traits<void> { using promise_type = promise_void; };
  24
  25 void test() {
  26   co_return; // expected-error {{mixed use of std and std::experimental namespaces for coroutine components}}
  27   // expected-warning@-1{{support for 'std::experimental::coroutine_traits' will be removed}}
  28   // expected-note@Inputs/std-coroutine-exp-namespace.h:8 {{'coroutine_traits' declared here}}
  29   // expected-note@Inputs/std-coroutine.h:18 {{'coroutine_traits' declared here}}
  30 }