Limeth

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

fn main() {
    let mut map: HashMap<(), Box<Fn() -> Box<Any>>> = HashMap::new();
    map.insert((), Box::new(|| {
        let val: Box<Box<Trait>> = Box::new(Box::new(A));
        val
    }));