1struct foo { 2 unsigned : 12; 3 unsigned field : 4; 4} foo; 5unsigned oldfoo; 6 7int 8bar (unsigned k) 9{ 10 oldfoo = foo.field; 11 foo.field = k; 12 if (k) 13 return 1; 14 return 2; 15} 16 17main () 18{ 19 if (bar (1U) != 1) 20 abort (); 21 exit (0); 22} 23