| // 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. |
| |
| #![feature(rustc_attrs)] |
| |
| // revisions: good bad |
| |
| trait Mirror { |
| type Image; |
| } |
| |
| impl<T> Mirror for T { |
| type Image = T; |
| } |
| |
| #[cfg(bad)] |
| fn foo<U, T>(_t: T) |
| where for<'a> &'a T: Mirror<Image=U> |
| {} |
| |
| #[cfg(good)] |
| fn foo<U, T>(_t: T) |
| where for<'a> &'a T: Mirror<Image=&'a U> |
| {} |
| |
| #[rustc_error] |
| fn main() { //[good]~ ERROR compilation successful |
| foo(()); |
| //[bad]~^ ERROR type mismatch resolving `for<'a> <&'a _ as Mirror>::Image == _` |
| //[bad]~| expected bound lifetime parameter 'a, found concrete lifetime |
| } |