text: //===----------------------------------------------------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  
  // UNSUPPORTED: c++03, c++11
  
  // <experimental/coroutine>
  
  // template <class Promise>
  // struct coroutine_handle<Promise>;
  
  // Promise& promise() const
  
  #include <experimental/coroutine>
  #include <type_traits>
  #include <memory>
  #include <utility>
  #include <cstdint>
  #include <cassert>
  
  #include "test_macros.h"
  
  namespace coro = std::experimental;
  
  struct MyCoro {
    struct promise_type {
      void unhandled_exception() {}
      void return_void() {}
      coro::suspend_never initial_suspend() { return {}; }
      coro::suspend_never final_suspend() noexcept { return {}; }
      MyCoro get_return_object() {
        do_runtime_test();
        return {};
      }
      void do_runtime_test() {
        // Test that a coroutine_handle<const T> can be created from a const
        // promise_type and that it represents the same coroutine as
        // coroutine_handle<T>
        using CH = coro::coroutine_handle<promise_type>;
        using CCH = coro::coroutine_handle<const promise_type>;
        const auto &cthis = *this;
        CH h = CH::from_promise(*this);
        CCH h2 = CCH::from_promise(*this);
        CCH h3 = CCH::from_promise(cthis);
        assert(&h.promise() == this);
        assert(&h2.promise() == this);
        assert(&h3.promise() == this);
        assert(h.address() == h2.address());
        assert(h2.address() == h3.address());
      }
    };
  };
  
  MyCoro do_runtime_test() {
    co_await coro::suspend_never{};
  }
  
  template <class Promise>
  void do_test(coro::coroutine_handle<Promise>&& H) {
  
    // FIXME Add a runtime test
    {
      ASSERT_SAME_TYPE(decltype(H.promise()), Promise&);
      LIBCPP_ASSERT_NOT_NOEXCEPT(H.promise());
    }
    {
      auto const& CH = H;
      ASSERT_SAME_TYPE(decltype(CH.promise()), Promise&);
      LIBCPP_ASSERT_NOT_NOEXCEPT(CH.promise());
    }
  }
  
  int main(int, char**)
  {
    do_test(coro::coroutine_handle<int>{});
    do_test(coro::coroutine_handle<const int>{});
    do_runtime_test();
  
    return 0;
  }
  