File: 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
}