fn main() {
    let a = "foo".to_owned();
    let b = &a as *const String;
    let c = b as *const dyn core::fmt::Debug;
    // let d = c as *const dyn core::fmt::Display;
    let d = unsafe { core::mem::transmute::<_, *const dyn core::fmt::Display>(c) };
    println!("{}", unsafe { &*d });
}