| // 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. |
| |
| // Test that `&mut T` implements `DerefMut<T>` |
| |
| |
| use std::ops::{Deref, DerefMut}; |
| |
| fn inc<T: Deref<Target=isize> + DerefMut>(mut t: T) { |
| *t += 1; |
| } |
| |
| fn main() { |
| let mut x: isize = 5; |
| inc(&mut x); |
| assert_eq!(x, 6); |
| } |