1 // { dg-additional-options "-fsyntax-only -fexceptions -w" } 2 3 // Diagose missing coroutine handle class template. 4 5 namespace std { 6 // coroutine traits 7 template<typename _R, typename...> struct coroutine_traits { 8 using promise_type = typename _R::promise_type; 9 }; 10 } 11 12 int bad_coroutine(void)13bad_coroutine (void) 14 { 15 co_yield 5; // { dg-error {coroutines require a handle class template; cannot find 'std::coroutine_handle'} } 16 co_return; 17 } 18