val hoge: Hoge? if (savedInstanceState != null) { hoge = savedInstanceState.getParcelable("hoge") } else { hoge = arguments?.getParcelable("hoge") } if (hoge == null) { throw IllegalArgumentException() } val hoge: Hoge = if (savedInstanceState != null) { savedInstanceState.getParcelable("hoge") } else { arguments?.getParcelable("hoge") } ?: throw IllegalArgumentException()