struct Bar {
    long	b1;
    char	b2;
};

union Foo switch (long) {
case 1: long x;
case 2: Bar y;
default: char z;
};


union Foo2 switch (char) {
  case 'a': long x;
  case 'b': Foo y;
};

interface a {
	struct astruct {
		Foo2	a1;
		Foo	a2;
		Bar	a3;
	};
	Foo2	opA(in astruct b);
};