// check-pass // edition: 2021 #![feature(return_position_impl_trait_in_trait)] #![allow(incomplete_features)] use std::fmt::Debug; trait Foo { fn foo<'a>(&'a self) -> impl Debug where Item: 'a; } impl Foo for D { fn foo<'a>(&'a self) -> impl Debug where Item: 'a, { self.clone() } } fn main() {}