| // 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 `&T` and `&mut T` implement `Deref<T>` |
| |
| |
| use std::ops::Deref; |
| |
| fn deref<U:Copy,T:Deref<Target=U>>(t: T) -> U { |
| *t |
| } |
| |
| fn main() { |
| let x: isize = 3; |
| let y = deref(&x); |
| assert_eq!(y, 3); |
| |
| let mut x: isize = 4; |
| let y = deref(&mut x); |
| assert_eq!(y, 4); |
| } |