rust/tests/ui/wf/wf-convert-unsafe-trait-obj-box.rs

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// Check that we do not allow casts or coercions
// to object unsafe trait objects inside a Box
#![feature(object_safe_for_dispatch)]
trait Trait: Sized {}
struct S;
impl Trait for S {}
fn takes_box(t: Box<dyn Trait>) {}
fn main() {
Box::new(S) as Box<dyn Trait>; //~ ERROR E0038
let t_box: Box<dyn Trait> = Box::new(S); //~ ERROR E0038
takes_box(Box::new(S)); //~ ERROR E0038
}