33 lines
1.0 KiB
Rust
33 lines
1.0 KiB
Rust
// Copyright 2013 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 free regions ordering only goes one way. That is,
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// we have `&'a Node<'b, T>`, which implies that `'a <= 'b`,
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// but not `'b <= 'a`. Hence returning `&self.val` (which has lifetime
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// `'a`) where `'b` is expected yields an error.
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//
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// This test began its life as a test for issue #4325.
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struct Node<'b, T> {
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val: T,
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next: Option<&'b Node<'b, T>>
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}
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impl<'b, T> Node<'b, T> {
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fn get<'a>(&'a self) -> &'b T {
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match self.next {
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Some(ref next) => next.get(),
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None => &self.val //~ ERROR cannot infer an appropriate lifetime
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}
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}
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}
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fn main() {}
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