struct token_data{  enum token_data_type type;  union  {    struct    {      char *text;    }    u_t;    struct    {      builtin_func *func;      boolean traced;    }    u_f;  }  u;};foo (){  while (1)    {      foobar ();    }  do    {      ralph ();    }  while (nigel ());  switch (x)    {    case 33:      break;    case 49:      printf ("foobar");      {	int i;	i = 23;	f (i);      }    default:      {	int x;	abort ();      }      ;    }}