26         std::ifstream fs;  in main()  local
27         assert(!fs.is_open());  in main()
29         fs >> c;  in main()
30         assert(fs.fail());  in main()
32         fs.open("test.dat");  in main()
33         assert(fs.is_open());  in main()
34         fs >> c;  in main()
39         std::wifstream fs;  in main()  local
40         assert(!fs.is_open());  in main()
42         fs >> c;  in main()
43         assert(fs.fail());  in main()
45         fs.open("test.dat");  in main()
46         assert(fs.is_open());  in main()
47         fs >> c;  in main()