31 lines
1.0 KiB
Rust
31 lines
1.0 KiB
Rust
// Copyright 2012 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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// Test that a type which is invariant with respect to its region
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// parameter used in a covariant way yields an error.
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//
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// Note: see variance-regions-*.rs for the tests that check that the
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// variance inference works in the first place.
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struct Invariant<'a> {
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f: &'a mut &'a isize
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}
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fn use_<'b>(c: Invariant<'b>) {
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// For this assignment to be legal, Invariant<'b> <: Invariant<'static>.
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// Since 'b <= 'static, this would be true if Invariant were covariant
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// with respect to its parameter 'a.
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let _: Invariant<'static> = c; //~ ERROR mismatched types
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}
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fn main() { }
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