void main() {
  var id1=Intid(100);
  id1.showId();
  var id2=Intid(200);
  id1<id2.i;
}

extension type Intid(int i){
  showId()=>print('$i');
  operator <(int other)=>i<other;
}
extension type Intid2.n(int i){
  Intid2(this.i);
  showId()=>print('$i');
  operator <(int other)=>i<other;
}