| // 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. |
| |
| #![feature(box_syntax)] |
| |
| struct ctxt { v: usize } |
| |
| trait get_ctxt { |
| // Here the `&` is bound in the method definition: |
| fn get_ctxt(&self) -> &ctxt; |
| } |
| |
| struct has_ctxt<'a> { c: &'a ctxt } |
| |
| impl<'a> get_ctxt for has_ctxt<'a> { |
| |
| // Here an error occurs because we used `&self` but |
| // the definition used `&`: |
| fn get_ctxt(&self) -> &'a ctxt { //~ ERROR method not compatible with trait |
| self.c |
| } |
| |
| } |
| |
| fn get_v(gc: Box<get_ctxt>) -> usize { |
| gc.get_ctxt().v |
| } |
| |
| fn main() { |
| let ctxt = ctxt { v: 22 }; |
| let hc = has_ctxt { c: &ctxt }; |
| assert_eq!(get_v(box hc as Box<get_ctxt>), 22); |
| } |