Convert Box<Trait> To concrete type with unsafe

box_t_to_ref_t_with_unsafe.rs

trait Animal {
    fn speak(&self);
}

#[derive(Debug)]
struct Dog {
    name: String,
    age: u8,
}

impl Animal for Dog {
    fn speak(&self) {
        println!("wuf..wuf...");
    }
}

fn main() {
    let animal: Box<dyn Animal> = Box::new(Dog {
        name: "BigEyes".to_owned(),
        age: 2,
    });

    let ptr = Box::into_raw(animal) as *mut (*mut (), *mut ());
    let dog: &Dog = unsafe { std::mem::transmute(ptr) };
    dbg!(dog);
}