1 struct a { unsigned int bitfield : 1; }; 2 3 unsigned int x; 4 main()5 main() 6 { 7 struct a a = {0}; 8 x = 0xbeef; 9 a.bitfield |= x; 10 if (a.bitfield != 1) 11 abort (); 12 exit (0); 13 } 14