1 // Tests that we'll emit the proper diagnostic message if we failed to find `::operator new(size_t, nothrow_t)`. 2 // RUN: %clang_cc1 %s -std=c++20 %s -fsyntax-only -verify 3 4 namespace std { 5 template <typename... T> 6 struct coroutine_traits; 7 8 template <class Promise = void> 9 struct coroutine_handle { 10 coroutine_handle() = default; from_addressstd::coroutine_handle11 static coroutine_handle from_address(void *) noexcept { return {}; } 12 }; 13 14 template <> 15 struct coroutine_handle<void> { from_addressstd::coroutine_handle16 static coroutine_handle from_address(void *) { return {}; } 17 coroutine_handle() = default; 18 template <class PromiseType> coroutine_handlestd::coroutine_handle19 coroutine_handle(coroutine_handle<PromiseType>) noexcept {} 20 }; 21 22 struct suspend_always { await_readystd::suspend_always23 bool await_ready() noexcept { return false; } await_suspendstd::suspend_always24 void await_suspend(std::coroutine_handle<>) noexcept {} await_resumestd::suspend_always25 void await_resume() noexcept {} 26 }; 27 28 struct nothrow_t {}; 29 constexpr nothrow_t nothrow = {}; 30 31 } // end namespace std 32 33 using SizeT = decltype(sizeof(int)); 34 35 struct promise_on_alloc_failure_tag {}; 36 37 template <> 38 struct std::coroutine_traits<int, promise_on_alloc_failure_tag> { 39 struct promise_type { get_return_objectstd::coroutine_traits::promise_type40 int get_return_object() { return 0; } initial_suspendstd::coroutine_traits::promise_type41 std::suspend_always initial_suspend() { return {}; } final_suspendstd::coroutine_traits::promise_type42 std::suspend_always final_suspend() noexcept { return {}; } return_voidstd::coroutine_traits::promise_type43 void return_void() {} unhandled_exceptionstd::coroutine_traits::promise_type44 void unhandled_exception() {} get_return_object_on_allocation_failurestd::coroutine_traits::promise_type45 static int get_return_object_on_allocation_failure() { return -1; } 46 }; 47 }; 48 f(promise_on_alloc_failure_tag)49extern "C" int f(promise_on_alloc_failure_tag) { // expected-error 1+{{unable to find '::operator new(size_t, nothrow_t)' for 'f'}} 50 co_return; 51 } 52