26         std::ios ios(0);  in main()  local
27         assert(ios.fail());  in main()
28         ios.setstate(std::ios::eofbit);  in main()
29         assert(ios.fail());  in main()
33         std::ios ios(&sb);  in main()  local
34         assert(!ios.fail());  in main()
35         ios.setstate(std::ios::eofbit);  in main()
36         assert(!ios.fail());  in main()
37         ios.setstate(std::ios::badbit);  in main()
38         assert(ios.fail());  in main()
39         ios.setstate(std::ios::failbit);  in main()
40         assert(ios.fail());  in main()