//ww:run-exit 30
package main;
fn mk(s: str) (str | void) = { return s; };
fn pick(r: (i64 | str | void)) i32 = {
	match (r) {
	case let n: i64 => return 10;
	case let s: str => { if (len(s) != 5) { return 4; }; return 30; };
	case void => return 20;
	};
};
export fn main() i32 = { return pick(mk("hello")); };