Rust code shared from the playground

erasure.rs

fn main() {
    let a = Test(None);
    a.print();
    let b = Test(Some(23));//Box::new(Test(Some(23)));
    b.print();
    print_it(&b);
}

struct Test (Option<i32>);

impl Print for Test {
    fn print_value(&self) -> Option<i32> {
        self.0
    }
}

trait Print {
    fn print_value(&self) -> Option<i32>;
    
    fn print(&self) {
        if let Some(ref v) = self.print_value() {
            if *v > 100 {
                println!("{}", v);
            }
        }
    }
}

fn print_it<T: Print>(s: &T) {
    let v = s.print_value().unwrap_or_else(|| -1);
    if v > 100 {
        println!("{}", v);
    }
}