| // Copyright 2016 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 we are able to type-check this example. In particular, |
| // knowing that `T: 'a` allows us to deduce that `[U]: 'a` (because |
| // when `T=[U]` it implies that `U: 'a`). |
| // |
| // Regr. test for live code we found in the wild when fixing #18937. |
| |
| pub trait Leak<T : ?Sized> { |
| fn leak<'a>(self) -> &'a T where T: 'a; |
| } |
| |
| impl<U> Leak<[U]> for Vec<U> { |
| fn leak<'a>(mut self) -> &'a [U] where [U]: 'a { |
| let r: *mut [U] = &mut self[..]; |
| std::mem::forget(self); |
| unsafe { &mut *r } |
| } |
| } |
| fn main() { |
| println!("Hello, world!"); |
| } |
