1  typedef struct
       2  {
       3    unsigned char a  : 2;
       4    unsigned char b  : 3;
       5    unsigned char c  : 1;
       6    unsigned char d  : 1;
       7    unsigned char e  : 1;
       8  } a_struct;
       9  
      10  foo (flags)
      11       a_struct *flags;
      12  {
      13    return (flags->c != 0
      14  	  || flags->d != 1
      15  	  || flags->e != 1
      16  	  || flags->a != 2
      17  	  || flags->b != 3);
      18  }
      19  
      20  main ()
      21  {
      22    a_struct flags;
      23  
      24    flags.c  = 0;
      25    flags.d  = 1;
      26    flags.e  = 1;
      27    flags.a  = 2;
      28    flags.b  = 3;
      29  
      30    if (foo (&flags) != 0)
      31      abort ();
      32    else
      33      exit (0);
      34  }