| // Copyright 2017 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(rustc_attrs)] |
| #![allow(warnings)] |
| |
| struct Attr { |
| name: String, |
| value: String, |
| } |
| |
| struct Element { |
| attrs: Vec<Box<Attr>>, |
| } |
| |
| impl Element { |
| pub unsafe fn get_attr<'a>(&'a self, name: &str) { |
| self.attrs |
| .iter() |
| .find(|attr| { |
| let attr: &&Box<Attr> = std::mem::transmute(attr); |
| true |
| }); |
| } |
| } |
| |
| #[rustc_error] |
| fn main() { //~ ERROR compilation successful |
| let element = Element { attrs: Vec::new() }; |
| let _ = unsafe { element.get_attr("foo") }; |
| } |
