| // 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. |
| |
| pub trait MakeRef<'a> { |
| type Ref; |
| } |
| impl<'a, T: 'a> MakeRef<'a> for T { |
| type Ref = &'a T; |
| } |
| |
| pub trait MakeRef2 { |
| type Ref2; |
| } |
| impl<'a, T: 'a> MakeRef2 for T { |
| //~^ ERROR the lifetime parameter `'a` is not constrained |
| type Ref2 = <T as MakeRef<'a>>::Ref; |
| } |
| |
| fn foo() -> <String as MakeRef2>::Ref2 { &String::from("foo") } |
| |
| fn main() { |
| println!("{}", foo()); |
| } |
