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 ();}      ;    }}