{

boost::promise<void> promise;

promise.set_value();

return promise.get_future();

{

auto sendFuture = createFuture();

auto wrappedFuture = sendFuture.then(executor, [](auto f) mutable {

return createFuture();

});

return wrappedFuture.unwrap();

{

auto future = stepOne(executor);

return future.then(executor, [](auto f) {

assert(f.is_ready());

});

{

boost::basic_thread_pool executor{1};

stepTwo(executor).get();