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