Function catch

include/boost/asio/impl/co_spawn.hpp:170–176

  }
#if !defined(BOOST_ASIO_NO_EXCEPTIONS)
  catch (...)
  {
    if (done)
      throw;

    e = std::current_exception();
  }
#endif // !defined(BOOST_ASIO_NO_EXCEPTIONS)

  bool is_launching = (co_await awaitable_thread_is_launching{});