28         std::shared_future<T> f0 = p.get_future();  in main()  local
30         f = std::move(f0);  in main()
31         assert(!f0.valid());  in main()
36         std::shared_future<T> f0;  in main()  local
38         f = std::move(f0);  in main()
39         assert(!f0.valid());  in main()
45         std::shared_future<T> f0 = p.get_future();  in main()  local
47         f = std::move(f0);  in main()
48         assert(!f0.valid());  in main()
53         std::shared_future<T> f0;  in main()  local
55         f = std::move(f0);  in main()
56         assert(!f0.valid());  in main()
62         std::shared_future<T> f0 = p.get_future();  in main()  local
64         f = std::move(f0);  in main()
65         assert(!f0.valid());  in main()
70         std::shared_future<T> f0;  in main()  local
72         f = std::move(f0);  in main()
73         assert(!f0.valid());  in main()