| // 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. |
| |
| // run-pass |
| #![allow(dead_code)] |
| // Test that a type which is covariant with respect to its region |
| // parameter is successful when used in a covariant way. |
| // |
| // Note: see compile-fail/variance-regions-*.rs for the tests that |
| // check that the variance inference works in the first place. |
| |
| // This is covariant with respect to 'a, meaning that |
| // Covariant<'foo> <: Covariant<'static> because |
| // 'foo <= 'static |
| // pretty-expanded FIXME #23616 |
| |
| struct Covariant<'a> { |
| f: extern "Rust" fn(&'a isize) |
| } |
| |
| fn use_<'a>(c: Covariant<'a>) { |
| // OK Because Covariant<'a> <: Covariant<'static> iff 'a <= 'static |
| let _: Covariant<'static> = c; |
| } |
| |
| pub fn main() {} |