| // 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. |
| |
| // Regression test for #47511: anonymous lifetimes can appear |
| // unconstrained in a return type, but only if they appear just once |
| // in the input, as the input to a projection. |
| |
| fn f(_: X) -> X { |
| //~^ ERROR return type references an anonymous lifetime |
| unimplemented!() |
| } |
| |
| fn g<'a>(_: X<'a>) -> X<'a> { |
| //~^ ERROR return type references lifetime `'a`, which is not constrained |
| unimplemented!() |
| } |
| |
| type X<'a> = <&'a () as Trait>::Value; |
| |
| trait Trait { |
| type Value; |
| } |
| |
| impl<'a> Trait for &'a () { |
| type Value = (); |
| } |
| |
| fn main() {} |
