@Js
class Main
{
  virtual Int x := 0

  Void main()
  {
    //this.x() = fan.sys.Int.plus(this.x(),4);
    x += 4
  }
}

Expected: this.x$(fan.sys.Int.plus(this.x(),4));

This occurs when the field is virtual or abstract .

Promoted to ticket #1683 and assigned to andy

Ticket resolved in 1.0.62

Fixed - changeset