public type Session {
  private key: Text
  label: Text
}

public make(key: Text) (answer: Session) {
  answer = Session { key = key, label = "原名" }
}

public read(value: Session) (answer: Text) {
  answer = value.key
}

public change(value: Session, key: Text) (answer: Session) {
  value.key = key
  answer = value
}