chst1

Hi！There are following codes in collect function: ``` if (!executors.empty()) { auto work = [](Try&& t) { return std::move(t).value(); }; future = std::move(future).defer(work); const auto& deferredExecutor = futures::detail::getDeferredExecutor(future); deferredExecutor->setNestedExecutors(std::move(executors)); }...