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1 | // Copyright 2014 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 | // Test equality constraints on associated types in a where clause. | |
12 | ||
c34b1796 | 13 | |
1a4d82fc JJ |
14 | pub trait Foo { |
15 | type A; | |
16 | fn boo(&self) -> <Self as Foo>::A; | |
17 | } | |
18 | ||
62682a34 | 19 | #[derive(PartialEq, Debug)] |
c34b1796 | 20 | pub struct Bar; |
1a4d82fc | 21 | |
c34b1796 AL |
22 | impl Foo for isize { |
23 | type A = usize; | |
24 | fn boo(&self) -> usize { 42 } | |
1a4d82fc JJ |
25 | } |
26 | ||
27 | impl Foo for Bar { | |
c34b1796 AL |
28 | type A = isize; |
29 | fn boo(&self) -> isize { 43 } | |
1a4d82fc JJ |
30 | } |
31 | ||
32 | impl Foo for char { | |
33 | type A = Bar; | |
34 | fn boo(&self) -> Bar { Bar } | |
35 | } | |
36 | ||
37 | fn foo1<I: Foo<A=Bar>>(x: I) -> Bar { | |
38 | x.boo() | |
39 | } | |
40 | ||
41 | fn foo2<I: Foo>(x: I) -> <I as Foo>::A { | |
42 | x.boo() | |
43 | } | |
44 | ||
45 | pub fn main() { | |
85aaf69f | 46 | let a = 42; |
62682a34 | 47 | assert_eq!(foo2(a), 42); |
1a4d82fc JJ |
48 | |
49 | let a = Bar; | |
62682a34 | 50 | assert_eq!(foo2(a), 43); |
1a4d82fc JJ |
51 | |
52 | let a = 'a'; | |
53 | foo1(a); | |
62682a34 | 54 | assert_eq!(foo2(a), Bar); |
1a4d82fc | 55 | } |