@Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    SubtypingConstraint that = (SubtypingConstraint)o;

    if (myS != null ? !myS.equals(that.myS) : that.myS != null) return false;
    if (myT != null ? !myT.equals(that.myT) : that.myT != null) return false;

    return true;
  }
@Override
  public boolean equals(Object o)