rust-clippy/tests/run-pass/needless_lifetimes_impl_trait.rs

// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![deny(clippy::needless_lifetimes)]
#![allow(dead_code)]

trait Foo {}

struct Bar {}

struct Baz<'a> {
    bar: &'a Bar,
}

impl<'a> Foo for Baz<'a> {}

impl Bar {
    fn baz<'a>(&'a self) -> impl Foo + 'a {
        Baz { bar: self }
    }
}

fn main() {}