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[rust.git] / src / test / run-pass / regions-issue-22246.rs
1 // Copyright 2015 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 // Regression test for issue #22246 -- we should be able to deduce
12 // that `&'a B::Owned` implies that `B::Owned : 'a`.
13
14 // pretty-expanded FIXME #23616
15
16 #![allow(dead_code)]
17
18 use std::ops::Deref;
19
20 pub trait ToOwned {
21     type Owned: Borrow<Self>;
22     fn to_owned(&self) -> Self::Owned;
23 }
24
25 pub trait Borrow<Borrowed> {
26     fn borrow(&self) -> &Borrowed;
27 }
28
29 pub struct Foo<B:ToOwned> {
30     owned: B::Owned
31 }
32
33 fn foo<B:ToOwned>(this: &Foo<B>) -> &B {
34     this.owned.borrow()
35 }
36
37 fn main() { }