| // 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. |
| |
| // Test that we can coerce an `@Object` to an `&Object` |
| |
| |
| trait Foo { |
| fn foo(&self) -> usize; |
| fn bar(&mut self) -> usize; |
| } |
| |
| impl Foo for usize { |
| fn foo(&self) -> usize { |
| *self |
| } |
| |
| fn bar(&mut self) -> usize { |
| *self += 1; |
| *self |
| } |
| } |
| |
| fn do_it_mut(obj: &mut Foo) { |
| let x = obj.bar(); |
| let y = obj.foo(); |
| assert_eq!(x, y); |
| |
| do_it_imm(obj, y); |
| } |
| |
| fn do_it_imm(obj: &Foo, v: usize) { |
| let y = obj.foo(); |
| assert_eq!(v, y); |
| } |
| |
| pub fn main() { |
| let mut x: usize = 22; |
| let obj = &mut x as &mut Foo; |
| do_it_mut(obj); |
| do_it_imm(obj, 23); |
| do_it_mut(obj); |
| } |