rust/src/test/run-pass/issue-19129-1.rs

// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// 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.

// pretty-expanded FIXME #23616

trait Trait<Input> {
    type Output;

    fn method() -> <Self as Trait<Input>>::Output;
}

impl<T> Trait<T> for () {
    type Output = ();

    fn method() {}
}

fn main() {}