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1 | // Copyright 2012-2014 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 | // This is a regression test for something that only came up while | |
12 | // attempting to bootstrap libsyntax; it is adapted from | |
13 | // `syntax::ext::tt::generic_extension`. | |
14 | ||
c34b1796 | 15 | |
85aaf69f SL |
16 | pub struct E<'a> { |
17 | pub f: &'a u8, | |
18 | } | |
19 | impl<'b> E<'b> { | |
20 | pub fn m(&self) -> &'b u8 { self.f } | |
21 | } | |
22 | ||
23 | pub struct P<'c> { | |
24 | pub g: &'c u8, | |
25 | } | |
26 | pub trait M { | |
27 | fn n(&self) -> u8; | |
28 | } | |
29 | impl<'d> M for P<'d> { | |
30 | fn n(&self) -> u8 { *self.g } | |
31 | } | |
32 | ||
33 | fn extension<'e>(x: &'e E<'e>) -> Box<M+'e> { | |
34 | loop { | |
35 | let p = P { g: x.m() }; | |
36 | return Box::new(p) as Box<M+'e>; | |
37 | } | |
38 | } | |
39 | ||
40 | fn main() { | |
c34b1796 | 41 | let w = E { f: &10 }; |
85aaf69f | 42 | let o = extension(&w); |
c34b1796 | 43 | assert_eq!(o.n(), 10); |
85aaf69f | 44 | } |