Disregard: Broken attempt at `type_id` hack on stable Rust with no unsafe

[traviscross]

[Edit: Removed a bunch of things that don't matter because this doesn't do what was intended:]

use core::{any::TypeId, marker::PhantomData};

fn type_id_of<T: ?Sized>() -> TypeId {
    trait Marker {}
    impl<T: ?Sized> Marker for T {}
    fn hack<T: ?Sized + Marker + 'static>(_: *const T) -> TypeId {
        TypeId::of::<T>()
    }
    let p = &PhantomData::<T>;
    let p = &raw const *p as *const (dyn Marker + 'static);
    hack(p)
}

fn type_id_of_val<T: ?Sized>(_: &T) -> TypeId {
    type_id_of::<T>()
}

fn main() {
    let x = ();
    dbg!(type_id_of_val(&x));
}

[compiler-errors]

@traviscross:

All this code does is compute the type id of the type dyn Marker + 'static. It's not violating any sort of library UB. https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=6a90175675c2021bf4f385714a3507a1

What exactly are you trying to demonstrate in this code?

[compiler-errors]

Also @traviscross could you please quit tagging approximately everyone in the world and then editing away those tags as soon as someone comments? It's pretty disruptive 😅

[traviscross]

OK, thanks for that. One moment, I went too far in trying to simplify the example, but I may still have a version that works.

[traviscross]

No, never mind. I thought I had something, but it doesn't work. Obviously have been staring at this too long. Sorry for the noise.