1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // Tests that unary structs can be mutably borrowed.
16 fn next(&mut self) -> Option<U>;
18 impl T<int> for Empty {
19 fn next(&mut self) -> Option<int> { None }
22 fn do_something_with(a : &mut T<int>) {
23 println!("{:?}", a.next())
27 do_something_with(&mut Empty);