ices/71659.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#71659

#![feature(unsize)]

use core::marker::Unsize;

pub trait CastTo<T: ?Sized>: Unsize<T> {
    fn cast_to(&self) -> &T;
}

impl<T: ?Sized, U: ?Sized + Unsize<T>> CastTo<T> for U {
    fn cast_to(&self) -> &T {
        self
    }
}

impl<T: ?Sized> Cast for T {}
pub trait Cast {
    fn cast<T: ?Sized>(&self) -> &T
    where
        Self: CastTo<T>,
    {
        self
    }
}

pub trait Foo: CastTo<[i32]> {}
impl Foo for [i32; 0] {}

fn main() {
    let x: &dyn Foo = &[];
    let x = x.cast::<[i32]>();
}

=== stdout ===
=== stderr ===
error[E0277]: the trait bound `dyn Foo: CastTo<[i32]>` is not satisfied
  --> /home/runner/work/glacier/glacier/ices/71659.rs:30:15
   |
30 |     let x = x.cast::<[i32]>();
   |               ^^^^ the trait `CastTo<[i32]>` is not implemented for `dyn Foo`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.
==============