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1 | // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | // Uncovered during work on new scoping rules for safe destructors | |
12 | // as an important use case to support properly. | |
13 | ||
14 | pub struct E<'a> { | |
15 | pub f: &'a u8, | |
16 | } | |
17 | impl<'b> E<'b> { | |
18 | pub fn m(&self) -> &'b u8 { self.f } | |
19 | } | |
20 | ||
21 | pub struct P<'c> { | |
22 | pub g: &'c u8, | |
23 | } | |
24 | pub trait M { | |
25 | fn n(&self) -> u8; | |
26 | } | |
27 | impl<'d> M for P<'d> { | |
28 | fn n(&self) -> u8 { *self.g } | |
29 | } | |
30 | ||
31 | fn extension<'e>(x: &'e E<'e>) -> Box<M+'e> { | |
32 | loop { | |
33 | let p = P { g: x.m() }; | |
34 | return Box::new(p) as Box<M+'e>; | |
35 | } | |
36 | } | |
37 | ||
38 | fn main() { | |
39 | let w = E { f: &10u8 }; | |
40 | let o = extension(&w); | |
41 | assert_eq!(o.n(), 10u8); | |
42 | } |