-- a message MOVES on send: the sender's binding is dead afterwards

class Note {
  text: Text
}

class Sink {
  fn receive(msg: Note) {
    print(msg.text);
  }
}

fn main() -> Int {
  let a = spawn Sink {};
  let n = Note { text: "gone" };
  send(a, n);
  print(n.text);
  return 0;
}