1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // The "projection gap" is particularly "fun" around higher-ranked
12 // projections. This is because the current code is hard-coded to say
13 // that a projection that contains escaping regions, like `<T as
14 // Trait2<'y, 'z>>::Foo` where `'z` is bound, can only be found to
15 // outlive a region if all components that appear free (`'y`, where)
16 // outlive that region. However, we DON'T add those components to the
17 // implied bounds set, but rather we treat projections with escaping
18 // regions as opaque entities, just like projections without escaping
23 trait Trait2<'a, 'b> {
27 // As a side-effect of the conservative process above, the type of
28 // this argument `t` is not automatically considered well-formed,
29 // since for it to be WF, we would need to know that `'y: 'x`, but we
31 fn callee<'x, 'y, T>(t: &'x for<'z> Trait1< <T as Trait2<'y, 'z>>::Foo >)
32 //~^ ERROR reference has a longer lifetime than the data it references