| // 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. |
| |
| // ignore-compare-mode-nll |
| |
| // Test that a type which is invariant with respect to its region |
| // parameter used in a covariant way yields an error. |
| // |
| // Note: see variance-regions-*.rs for the tests that check that the |
| // variance inference works in the first place. |
| |
| struct Invariant<'a> { |
| f: &'a mut &'a isize |
| } |
| |
| fn use_<'b>(c: Invariant<'b>) { |
| |
| // For this assignment to be legal, Invariant<'b> <: Invariant<'static>. |
| // Since 'b <= 'static, this would be true if Invariant were covariant |
| // with respect to its parameter 'a. |
| |
| let _: Invariant<'static> = c; //~ ERROR mismatched types |
| } |
| |
| fn main() { } |