35 lines
614 B
Rust
35 lines
614 B
Rust
// check-pass
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#![feature(return_position_impl_trait_in_trait, lint_reasons)]
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#![allow(incomplete_features)]
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use std::fmt::Display;
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use std::ops::Deref;
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pub trait Foo {
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fn bar(self) -> impl Deref<Target = impl Display + ?Sized>;
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}
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pub struct A;
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impl Foo for A {
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#[expect(refining_impl_trait)]
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fn bar(self) -> &'static str {
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"Hello, world"
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}
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}
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pub struct B;
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impl Foo for B {
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#[expect(refining_impl_trait)]
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fn bar(self) -> Box<i32> {
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Box::new(42)
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}
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}
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fn main() {
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println!("Message for you: {:?}", &*A.bar());
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println!("Another for you: {:?}", &*B.bar());
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}
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