//ww:run-exit 30
package main;
type pair = struct { a: i64, b: i64 };
fn mk(x: i64) (pair | void) = {
	let p: pair; p.a = x; p.b = x + 1;
	return p;
};
fn pick(r: (str | pair | void)) i32 = {
	match (r) {
	case let s: str => return 10;
	case let p: pair => { if (p.a != 5) { return 4; }; if (p.b != 6) { return 5; }; return 30; };
	case void => return 20;
	};
};
export fn main() i32 = { return pick(mk(5)); };