//@ run-pass
#![allow(dead_code)]
use std::iter::{Fuse, Zip};
fn fuse_covariant<'a, I>(iter: Fuse<&'static I>) -> Fuse<&'a I> { iter }
fn zip_covariant<'a, A, B>(iter: Zip<&'static A, &'static B>) -> Zip<&'a A, &'a B> { iter }
fn main() { }