struct foo
  {
    int a;
    int b;
    char c;
    float d;
    double e;
    struct
      {
	int s1;
	char s2;
	int s3;
	union
	  {
	    int u1;
	    char u2;
	    double u3;
	  } my_union;

	struct
	  {
	    int crazy_1;
	    union
	      {
		struct
		  {
		    int big_field;
		    char my_char;
		  };
		int blabla;
	      } union_2;
	  } my_inner;
      } my_inner2;
  };

int
main (int argc, char *argv[])
{
  struct foo a;

  return 0;
}