rust/src/test/run-pass/issue-21363.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

#![no_implicit_prelude]

trait Iterator {
    type Item;
    fn dummy(&self) { }
}

impl<'a, T> Iterator for &'a mut (Iterator<Item=T> + 'a) {
    type Item = T;
}

fn main() {}