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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. | |
4 | // | |
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. | |
10 | ||
11 | // Test that an invariant region parameter used in a contravariant way | |
12 | // yields an error. | |
13 | // | |
14 | // Note: see variance-regions-*.rs for the tests that check that the | |
15 | // variance inference works in the first place. | |
16 | ||
17 | struct Invariant<'a> { | |
18 | f: &'a mut &'a isize | |
19 | } | |
20 | ||
21 | fn use_<'short,'long>(c: Invariant<'long>, | |
22 | s: &'short isize, | |
23 | l: &'long isize, | |
24 | _where:Option<&'short &'long ()>) { | |
25 | ||
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. | |
29 | ||
ea8adc8c | 30 | let _: Invariant<'short> = c; //~ ERROR E0623 |
1a4d82fc JJ |
31 | } |
32 | ||
33 | fn main() { } |