| // Copyright 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. |
| |
| // Checks that regions which appear in a trait object type are |
| // observed by the variance inference algorithm (and hence |
| // `TOption` is contavariant w/r/t `'a` and not bivariant). |
| // |
| // Issue #18262. |
| |
| #![feature(rustc_attrs)] |
| |
| use std::mem; |
| |
| trait T { fn foo(&self); } |
| |
| #[rustc_variance] |
| struct TOption<'a> { //~ ERROR [-] |
| v: Option<Box<T + 'a>>, |
| } |
| |
| fn main() { } |
