rust/tests/crashes/54888.rs

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//@ known-bug: #54888
#![feature(unsize, coerce_unsized)]
use std::{
ops::CoerceUnsized,
marker::Unsize,
};
#[repr(C)]
struct Ptr<T: ?Sized>(Box<T>);
impl<T: ?Sized, U: ?Sized> CoerceUnsized<Ptr<U>> for Ptr<T>
where
T: Unsize<U>,
{}
fn main() {
let foo = Ptr(Box::new(5)) as Ptr<dyn std::any::Any>;
}