//ww:run-exit 33
package main;
type tu = (i64 | void);
fn nest(p: *[]i64, q: *[]i64, t: tu) void = {
	append(*p, match (t) {
	case let x: i64 => {
		append(*q, 500);
		yield x;
	};
	case void => {
		yield 0;
	};
	});
};
export fn main() i32 = {
	let a: []i64 = [];
	let b: []i64 = [];
	let t: tu = 7;
	nest(&a, &b, t);
	if (len(a) != 1) { return 1; };
	if (len(b) != 1) { return 2; };
	if (a[0] != 7) { return 3; };
	if (b[0] != 500) { return 4; };
	return 33;
};