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.
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.
11 pub trait Borrow<Borrowed: ?Sized> {
12 fn borrow(&self) -> &Borrowed;
15 impl<T: Sized> Borrow<T> for T {
16 fn borrow(&self) -> &T { self }
20 fn foo(&self, other: &Self);
23 fn bar<K, Q>(k: &K, q: &Q) where K: Borrow<Q>, Q: Foo {
30 // This caused a failure in #18906
31 fn bar<Q>(k: &K, q: &Q) where K: Borrow<Q>, Q: Foo {