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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 | ||
b7449926 XL |
11 | // run-pass |
12 | ||
54a0048b SL |
13 | // Ensure that provided items are inherited properly even when impls vary in |
14 | // type parameters *and* rely on projections. | |
15 | ||
16 | #![feature(specialization)] | |
17 | ||
18 | use std::convert::Into; | |
19 | ||
20 | trait Trait { | |
21 | fn to_u8(&self) -> u8; | |
22 | } | |
23 | trait WithAssoc { | |
24 | type Item; | |
25 | fn to_item(&self) -> Self::Item; | |
26 | } | |
27 | ||
28 | impl<T, U> Trait for T where T: WithAssoc<Item=U>, U: Into<u8> { | |
29 | fn to_u8(&self) -> u8 { | |
30 | self.to_item().into() | |
31 | } | |
32 | } | |
33 | ||
34 | impl WithAssoc for u8 { | |
35 | type Item = u8; | |
36 | fn to_item(&self) -> u8 { *self } | |
37 | } | |
38 | ||
39 | impl Trait for u8 {} | |
40 | ||
41 | fn main() { | |
42 | assert!(3u8.to_u8() == 3u8); | |
43 | } |