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1 | // Copyright 2015 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. | |
4 | // | |
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. | |
10 | ||
11 | // Regression test for #21726: an issue arose around the rules for | |
12 | // subtyping of projection types that resulted in an unconstrained | |
13 | // region, yielding region inference failures. | |
14 | ||
c34b1796 AL |
15 | // pretty-expanded FIXME #23616 |
16 | ||
85aaf69f SL |
17 | fn main() { } |
18 | ||
19 | fn foo<'a>(s: &'a str) { | |
20 | let b: B<()> = B::new(s, ()); | |
21 | b.get_short(); | |
22 | } | |
23 | ||
24 | trait IntoRef<'a> { | |
25 | type T: Clone; | |
26 | fn into_ref(self, &'a str) -> Self::T; | |
27 | } | |
28 | ||
29 | impl<'a> IntoRef<'a> for () { | |
30 | type T = &'a str; | |
31 | fn into_ref(self, s: &'a str) -> &'a str { | |
32 | s | |
33 | } | |
34 | } | |
35 | ||
36 | struct B<'a, P: IntoRef<'a>>(P::T); | |
37 | ||
38 | impl<'a, P: IntoRef<'a>> B<'a, P> { | |
39 | fn new(s: &'a str, i: P) -> B<'a, P> { | |
40 | B(i.into_ref(s)) | |
41 | } | |
42 | ||
43 | fn get_short(&self) -> P::T { | |
44 | self.0.clone() | |
45 | } | |
46 | } |