| // Copyright 2015 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 a "pass-through" object-lifetime-default that produces errors. |
| |
| #![allow(dead_code)] |
| |
| trait SomeTrait { |
| fn dummy(&self) { } |
| } |
| |
| struct MyBox<T:?Sized> { |
| r: Box<T> |
| } |
| |
| fn deref<T>(ss: &T) -> T { |
| // produces the type of a deref without worrying about whether a |
| // move out would actually be legal |
| loop { } |
| } |
| |
| fn load0(ss: &MyBox<SomeTrait>) -> MyBox<SomeTrait> { |
| deref(ss) |
| } |
| |
| fn load1<'a,'b>(a: &'a MyBox<SomeTrait>, |
| b: &'b MyBox<SomeTrait>) |
| -> &'b MyBox<SomeTrait> |
| { |
| a |
| //~^ ERROR cannot infer |
| } |
| |
| fn load2<'a>(ss: &MyBox<SomeTrait+'a>) -> MyBox<SomeTrait+'a> { |
| load0(ss) //~ ERROR mismatched types |
| } |
| |
| fn main() { |
| } |