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

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// Check that we do not allow casts or coercions
// to object unsafe trait objects by ref
#![feature(object_safe_for_dispatch)]
trait Trait: Sized {}
struct S;
impl Trait for S {}
fn takes_trait(t: &dyn Trait) {}
fn main() {
&S as &dyn Trait; //~ ERROR E0038
let t: &dyn Trait = &S; //~ ERROR E0038
takes_trait(&S); //~ ERROR E0038
}