namespace;
include rt, actor;
typecheck on;
int add_two(int n) { return n + 2; }
fn main() {
 actor.Actor<int,int>* a = rt.new(actor.Actor<int,int>);
 let total = 0;
 a.spawn(add_two); a.recv(fn(int value) { total += value; return 0; });
 a.send(2); a.send(3); a.await(); rt.put_n(total); rt.put_c(' ');
 a.send(1); a.await(); rt.put_n(total); rt.put_c(' ');
 a.close(); rt.put_n(a.send(4)); rt.put_c(10); return 0;
}