1 // Copyright 2012 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.
11 // Test that an invariant region parameter used in a contravariant way
14 // Note: see variance-regions-*.rs for the tests that check that the
15 // variance inference works in the first place.
17 struct Invariant<'a> {
21 fn use_<'short,'long>(c: Invariant<'long>,
24 _where:Option<&'short &'long ()>) {
26 // Test whether Invariant<'long> <: Invariant<'short>. Since
27 // 'short <= 'long, this would be true if the Invariant type were
28 // contravariant with respect to its parameter 'a.
30 let _: Invariant<'short> = c; //~ ERROR E0623