1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
13 // Test that even when `T` is only used in covariant position, it
14 // is treated as invariant.
16 trait Get<T> : 'static {
20 fn get_min_from_max<'min, 'max>(v: Box<Get<&'max i32>>)
21 -> Box<Get<&'min i32>>
24 // Previously OK, now an error as traits are invariant.
25 v //~ ERROR mismatched types
28 fn get_max_from_min<'min, 'max, G>(v: Box<Get<&'min i32>>)
29 -> Box<Get<&'max i32>>
32 v //~ ERROR mismatched types