| // Copyright 2012 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. |
| |
| |
| fn get<T>(opt: &Option<T>) -> &T { |
| match *opt { |
| Some(ref v) => v, |
| None => panic!("none") |
| } |
| } |
| |
| pub fn main() { |
| let mut x = Some(23); |
| |
| { |
| let y = get(&x); |
| assert_eq!(*y, 23); |
| } |
| |
| x = Some(24); |
| |
| { |
| let y = get(&x); |
| assert_eq!(*y, 24); |
| } |
| } |
