36 lines
1.0 KiB
Rust
36 lines
1.0 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![allow(dead_code)]
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// Test that even when `T` is only used in covariant position, it
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// is treated as invariant.
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trait Get<T> {
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fn get(&self) -> T;
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}
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fn get_min_from_max<'min, 'max, G>()
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where 'max : 'min, G : Get<&'max i32>
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{
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// Previously OK, now an error as traits are invariant.
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impls_get::<G,&'min i32>() //~ ERROR mismatched types
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}
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fn get_max_from_min<'min, 'max, G>()
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where 'max : 'min, G : Get<&'min i32>
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{
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impls_get::<G,&'max i32>() //~ ERROR mismatched types
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}
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fn impls_get<G,T>() where G : Get<T> { }
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fn main() { }
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