| // Copyright 2012-2014 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. |
| |
| // Testing that supertrait methods can be called on subtrait object types |
| |
| |
| trait Foo { |
| fn f(&self) -> isize; |
| } |
| |
| trait Bar : Foo { |
| fn g(&self) -> isize; |
| } |
| |
| struct A { |
| x: isize |
| } |
| |
| impl Foo for A { |
| fn f(&self) -> isize { 10 } |
| } |
| |
| impl Bar for A { |
| fn g(&self) -> isize { 20 } |
| } |
| |
| pub fn main() { |
| let a = &A { x: 3 }; |
| let afoo = a as &Foo; |
| let abar = a as &Bar; |
| assert_eq!(afoo.f(), 10); |
| assert_eq!(abar.g(), 20); |
| assert_eq!(abar.f(), 10); |
| } |
