void->int feedbackloop Fib {
  join roundrobin(0,1);
  body int->int filter { 
    work pop 1 push 1 peek 2 { push(peek(0) + peek(1)); pop(); }
  };
  loop Identity<int>;
  split duplicate;
  enqueue(0);
  enqueue(1);
}

int->void filter IntPrinter {
    work pop 1 { println(pop()); }
}

void->void pipeline FibProgram {
  add Fib();
  add IntPrinter();
}