Exception when use future and promise in the same thread

Question

I got an exception when using a future and a promise in the same thread, while using c++20.

The exception is throwed when prom.set_value(111);

terminate called after throwing an instance of 'std::system_error'
  what():  Unknown error -1

#include <future>
#include <iostream>

int main() {
  std::promise<int> prom;
  std::future<int> fut = prom.get_future();
  std::cout << "1 ok" << std::endl;
  prom.set_value(111);
  std::cout << "2 ok" << std::endl;
  std::cout << fut.get() << std::endl;
  return 0;
}

Run the above code on https://onlinegdb.com/gZp3cOOvj