Raw pointers in Rust

use std::rc::Rc;

trait Show {
    fn show(&self);
}

impl Show for u32 {
    fn show(&self){
        println!("{}:u32", self);
    }
}

impl Show for i8 {
    fn show(&self){
        println!("{}:i8", self);
    }
}

impl Show for String {
    fn show(&self){
        println!("{}:String", self);
    }
}


fn main() {
    let mut rcobj = Rc::new(0u32) as Rc<Show>;
    rcobj.show();
    rcobj = Rc::new(1i8) as Rc<Show>;
    rcobj.show();
    rcobj = Rc::new("It is Rc trait object".to_string()) as Rc<Show>;
    rcobj.show();

    let mut rawobj = &2u32 as *const Show;
    unsafe{(*rawobj).show();}
    rawobj = &3i8 as *const Show;
    unsafe{(*rawobj).show();}
    rawobj = &"It is raw trait object".to_string() as *const Show;
    unsafe{(*rawobj).show();}
}