27     std::thread::id id0;  in main()  local
30     assert(!(id0 <  id1));  in main()
31     assert( (id0 <= id1));  in main()
32     assert(!(id0 >  id1));  in main()
33     assert( (id0 >= id1));  in main()
34     assert(!(id0 == id2));  in main()
35     if (id0 < id2) {  in main()
36       assert( (id0 <= id2));  in main()
37       assert(!(id0 >  id2));  in main()
38       assert(!(id0 >= id2));  in main()
40       assert(!(id0 <= id2));  in main()
41       assert( (id0 >  id2));  in main()
42       assert( (id0 >= id2));  in main()