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// check-pass
#![feature(return_position_impl_trait_in_trait, lint_reasons)]
#![allow(incomplete_features)]
pub trait Foo {
fn f() -> Box<impl Sized>;
}
impl Foo for () {
#[expect(refining_impl_trait)]
fn f() -> Box<String> {
Box::new(String::new())
}
}
fn main() {
let x: Box<String> = <() as Foo>::f();
}
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