Function async_throw_from_initiation

test/exec/asio/test_completion_token.cpp:208–214

  template <typename CompletionToken>
  decltype(auto) async_throw_from_initiation(CompletionToken&& token)
  {
    using signature_type = void();
    return asio_impl::async_initiate<CompletionToken, signature_type>(
      [](auto const &) { throw std::logic_error("Test"); },
      token);
  }

  TEST_CASE("When initiating the asynchronous operation throws this causes the "
            "sender to send a std::exception_ptr",