34 lines
1.2 KiB
Rust
34 lines
1.2 KiB
Rust
// 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.
|
|
|
|
// Test that an invariant region parameter used in a contravariant 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_<'short,'long>(c: Invariant<'long>,
|
|
s: &'short isize,
|
|
l: &'long isize,
|
|
_where:Option<&'short &'long ()>) {
|
|
|
|
// Test whether Invariant<'long> <: Invariant<'short>. Since
|
|
// 'short <= 'long, this would be true if the Invariant type were
|
|
// contravariant with respect to its parameter 'a.
|
|
|
|
let _: Invariant<'short> = c; //~ ERROR mismatched types
|
|
}
|
|
|
|
fn main() { }
|