clang/test/SemaCXX/coroutine-mixed4-exp-namespace.cpp

   1 // RUN: %clang_cc1 -verify -std=c++20 -fsyntax-only %s
   2
   3 #include "Inputs/std-coroutine.h"
   4
   5 namespace std::experimental {
   6 // expected-note@+1{{declared here}}
   7 template <typename T> using coroutine_traits = std::coroutine_traits<T>;
   8 using std::coroutine_handle;
   9 } // namespace std::experimental
  10
  11 struct my_awaitable {
  12   bool await_ready() noexcept;
  13   void await_suspend(std::experimental::coroutine_handle<> coro) noexcept;
  14   void await_resume() noexcept;
  15 };
  16
  17 struct promise_void {
  18   void get_return_object();
  19   my_awaitable initial_suspend();
  20   my_awaitable final_suspend() noexcept;
  21   void return_void();
  22   void unhandled_exception();
  23 };
  24
  25 template <>
  26 struct std::coroutine_traits<void> { using promise_type = promise_void; };
  27
  28 void test() {
  29   co_return; // expected-error {{mixed use of std and std::experimental namespaces for coroutine components}}
  30   // expected-warning@-1{{support for 'std::experimental::coroutine_traits' will be removed}}
  31   // expected-note@Inputs/std-coroutine.h:18 {{'coroutine_traits' declared here}}
  32 }