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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 that we can use method notation to call methods based on a | |
12 | // where clause type, and not only type parameters. | |
13 | ||
c34b1796 | 14 | |
1a4d82fc | 15 | trait Foo { |
85aaf69f | 16 | fn foo(&self) -> i32; |
1a4d82fc JJ |
17 | } |
18 | ||
85aaf69f | 19 | impl Foo for Option<i32> |
1a4d82fc | 20 | { |
85aaf69f | 21 | fn foo(&self) -> i32 { |
1a4d82fc JJ |
22 | self.unwrap_or(22) |
23 | } | |
24 | } | |
25 | ||
85aaf69f | 26 | impl Foo for Option<u32> |
1a4d82fc | 27 | { |
85aaf69f SL |
28 | fn foo(&self) -> i32 { |
29 | self.unwrap_or(22) as i32 | |
1a4d82fc JJ |
30 | } |
31 | } | |
32 | ||
85aaf69f | 33 | fn check<T>(x: Option<T>) -> (i32, i32) |
1a4d82fc JJ |
34 | where Option<T> : Foo |
35 | { | |
36 | let y: Option<T> = None; | |
37 | (x.foo(), y.foo()) | |
38 | } | |
39 | ||
40 | fn main() { | |
85aaf69f SL |
41 | assert_eq!(check(Some(23u32)), (23, 22)); |
42 | assert_eq!(check(Some(23)), (23, 22)); | |
1a4d82fc | 43 | } |