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namespace std::experimental {
template <typename R, typename... T> struct coroutine_traits {
using promise_type = typename R::promise_type;
};
template <class Promise = void> struct coroutine_handle;
template <> struct coroutine_handle<void> {
static coroutine_handle from_address(void *) noexcept;
coroutine_handle() = default;
template <class PromiseType>
coroutine_handle(coroutine_handle<PromiseType>) noexcept;
};
template <class Promise> struct coroutine_handle : coroutine_handle<void> {
coroutine_handle() = default;
static coroutine_handle from_address(void *) noexcept;
};
}
struct suspend_always {
bool await_ready() noexcept;
void await_suspend(std::experimental::coroutine_handle<>) noexcept;
void await_resume() noexcept;
};
struct Task {
struct promise_type {
Task get_return_object();
void return_void() {}
suspend_always initial_suspend() noexcept;
suspend_always final_suspend() noexcept;
void unhandled_exception() noexcept;
};
};
template <typename _AwrT> auto SyncAwait(_AwrT &&A) {
if (!A.await_ready()) {
auto AwaitAsync = [&]() -> Task {
try { (void)(co_await A); } catch (...) {} // { dg-error {coroutines require a traits template; cannot find 'std::coroutine_traits'} }
};
Task t = AwaitAsync();
}
return A.await_resume();
}
void f() {
suspend_always test;
SyncAwait(test);
}
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