Hashmap using Any as value

gistfile1.txt

use std::any::Any;
use std::collections::HashMap;

#[derive(Debug)]
struct Struct1 {
    pub f1: u32,
    pub f2: u32,
}

#[derive(Debug)]
struct Struct2 {
    pub f1: u32,
}

fn is_struct1(s: &dyn Any) -> bool {
    s.is::<Struct1>()
}

fn main() {
    let mut hm: HashMap<String, &dyn Any> = HashMap::new();

    hm.insert(String::from("one"), &Struct1 { f1: 1, f2: 1 });

    hm.insert(String::from("two"), &Struct2 { f1: 0 });

    println!("contents are {:?}", hm.get("one").unwrap());

    let element = *hm.get("one").unwrap();

    let str = element.downcast_ref::<Struct1>().unwrap();
    println!("{:?}", str);

    assert!(is_struct1(element));

    assert!(is_struct1(&Struct1 { f1: 1, f2: 3 }));
}