rust/tests/ui/impl-trait/in-trait/reveal.rs

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