| // Copyright 2012 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. |
| |
| // The "projection gap" is particularly "fun" around higher-ranked |
| // projections. This is because the current code is hard-coded to say |
| // that a projection that contains escaping regions, like `<T as |
| // Trait2<'y, 'z>>::Foo` where `'z` is bound, can only be found to |
| // outlive a region if all components that appear free (`'y`, where) |
| // outlive that region. However, we DON'T add those components to the |
| // implied bounds set, but rather we treat projections with escaping |
| // regions as opaque entities, just like projections without escaping |
| // regions. |
| |
| trait Trait1<T> { } |
| |
| trait Trait2<'a, 'b> { |
| type Foo; |
| } |
| |
| // As a side-effect of the conservative process above, the type of |
| // this argument `t` is not automatically considered well-formed, |
| // since for it to be WF, we would need to know that `'y: 'x`, but we |
| // do not infer that. |
| fn callee<'x, 'y, T>(t: &'x for<'z> Trait1< <T as Trait2<'y, 'z>>::Foo >) |
| //~^ ERROR reference has a longer lifetime than the data it references |
| { |
| } |
| |
| fn main() { } |
