29 lines
845 B
Rust
29 lines
845 B
Rust
// Copyright 2014 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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// Checks that regions which appear in a trait object type are
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// observed by the variance inference algorithm (and hence
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// `TOption` is contavariant w/r/t `'a` and not bivariant).
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//
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// Issue #18262.
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#![feature(rustc_attrs)]
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use std::mem;
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trait T { fn foo(&self); }
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#[rustc_variance]
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struct TOption<'a> { //~ ERROR regions=[-]
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v: Option<Box<T + 'a>>,
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}
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fn main() { }
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