| // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // Test that we can use method notation to call methods based on a |
| // where clause type, and not only type parameters. |
| |
| |
| trait Foo { |
| fn foo(&self) -> i32; |
| } |
| |
| impl Foo for Option<i32> |
| { |
| fn foo(&self) -> i32 { |
| self.unwrap_or(22) |
| } |
| } |
| |
| impl Foo for Option<u32> |
| { |
| fn foo(&self) -> i32 { |
| self.unwrap_or(22) as i32 |
| } |
| } |
| |
| fn check<T>(x: Option<T>) -> (i32, i32) |
| where Option<T> : Foo |
| { |
| let y: Option<T> = None; |
| (x.foo(), y.foo()) |
| } |
| |
| fn main() { |
| assert_eq!(check(Some(23u32)), (23, 22)); |
| assert_eq!(check(Some(23)), (23, 22)); |
| } |