1 // Verify that we synthesized the coroutine for a lambda inside of a function template.
2 // RUN: %clang_cc1 -std=c++1z -fcoroutines-ts -triple=x86_64-unknown-linux-gnu -emit-llvm -o - %s -fexceptions -fcxx-exceptions -disable-llvm-passes | FileCheck %s
3 
4 namespace std::experimental {
5 template <typename R, typename... T> struct coroutine_traits {
6   using promise_type = typename R::promise_type;
7 };
8 
9 template <class Promise = void> struct coroutine_handle;
10 template <> struct coroutine_handle<void> {
11   static coroutine_handle from_address(void *) noexcept;
12   coroutine_handle() = default;
13   template <class PromiseType>
14   coroutine_handle(coroutine_handle<PromiseType>) noexcept;
15 };
16 template <class Promise> struct coroutine_handle : coroutine_handle<void> {
17   coroutine_handle() = default;
18   static coroutine_handle from_address(void *) noexcept;
19 };
20 }
21 
22 struct suspend_always {
23   bool await_ready() noexcept;
24   void await_suspend(std::experimental::coroutine_handle<>) noexcept;
25   void await_resume() noexcept;
26 };
27 
28 struct Task {
29   struct promise_type {
30     Task get_return_object();
return_voidTask::promise_type31     void return_void() {}
32     suspend_always initial_suspend() noexcept;
33     suspend_always final_suspend() noexcept;
34     void unhandled_exception() noexcept;
35   };
36 };
37 
SyncAwait(_AwrT && A)38 template <typename _AwrT> auto SyncAwait(_AwrT &&A) {
39   if (!A.await_ready()) {
40     auto AwaitAsync = [&]() -> Task {
41       try { (void)(co_await A); } catch (...) {}
42     };
43     Task t = AwaitAsync();
44   }
45   return A.await_resume();
46 }
47 
f()48 void f() {
49   suspend_always test;
50   SyncAwait(test);
51 }
52 
53 // Verify that we synthesized the coroutine for a lambda inside SyncAwait
54 // CHECK-LABEL: define linkonce_odr void @_ZZ9SyncAwaitIR14suspend_alwaysEDaOT_ENKUlvE_clEv(
55 //   CHECK: alloca %"struct.Task::promise_type"
56 //   CHECK: call token @llvm.coro.id(
57 //   CHECK: call i8 @llvm.coro.suspend(
58 //   CHECK: call i1 @llvm.coro.end(
59