struct Stuc {
    id: usize,
}

impl Stuc {
    fn fun(self) -> Box<Fn()> {
        Box::new(move ||{
            println!("id={}", self.id);
        })
    }
}

fn main() {
    let stuc = Stuc { id: 5 };
    let fun = stuc.fun();
    fun();
}