text: // RUN: %clang_cc1 -triple x86_64-apple-darwin9 %s -std=c++14 -fcoroutines-ts -fcxx-exceptions -fsyntax-only -Wignored-qualifiers -Wno-error=return-type -verify -fblocks -Wall -Wextra -Wno-error=unreachable-code
  // expected-no-diagnostics
  
  #include "Inputs/std-coroutine-exp-namespace.h"
  
  using std::experimental::suspend_always;
  using std::experimental::suspend_never;
  
  struct awaitable {
    bool await_ready();
    void await_suspend(std::experimental::coroutine_handle<>); // FIXME: coroutine_handle
    void await_resume();
  } a;
  
  struct object {
    ~object() {}
  };
  
  struct promise_void_return_value {
    void get_return_object();
    suspend_always initial_suspend();
    suspend_always final_suspend() noexcept;
    void unhandled_exception();
    void return_value(object);
  };
  
  struct VoidTagReturnValue {
    struct promise_type {
      VoidTagReturnValue get_return_object();
      suspend_always initial_suspend();
      suspend_always final_suspend() noexcept;
      void unhandled_exception();
      void return_value(object);
    };
  };
  
  template <typename T1>
  struct std::experimental::coroutine_traits<void, T1> { using promise_type = promise_void_return_value; };
  
  VoidTagReturnValue test() {
    object x = {};
    try {
      co_return {};
    } catch (...) {
      throw;
    }
  }
  