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 a type which is covariant with respect to its region
12 // parameter yields an error when 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 // `S` is contravariant with respect to both parameters.
23 fn use_<'short,'long>(c: S<'long, 'short>,
26 _where:Option<&'short &'long ()>) {
28 let _: S<'long, 'short> = c; // OK
29 let _: S<'short, 'short> = c; // OK
31 // Test whether S<_,'short> <: S<_,'long>. Since
32 // 'short <= 'long, this would be true if the Contravariant type were
33 // covariant with respect to its parameter 'a.
35 let _: S<'long, 'long> = c; //~ ERROR E0623