| // 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. |
| |
| // Tests that unary structs can be mutably borrowed. |
| |
| struct Empty; |
| |
| trait T<U> { |
| fn next(&mut self) -> Option<U>; |
| } |
| impl T<isize> for Empty { |
| fn next(&mut self) -> Option<isize> { None } |
| } |
| |
| fn do_something_with(a : &mut T<isize>) { |
| println!("{:?}", a.next()) |
| } |
| |
| pub fn main() { |
| do_something_with(&mut Empty); |
| } |
