| // Copyright 2015 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. |
| |
| // check that trait matching can handle impls whose types are only |
| // constrained by a projection. |
| |
| trait IsU32 {} |
| impl IsU32 for u32 {} |
| |
| trait Mirror { type Image: ?Sized; } |
| impl<T: ?Sized> Mirror for T { type Image = T; } |
| |
| trait Bar {} |
| impl<U: Mirror, V: Mirror<Image=L>, L: Mirror<Image=U>> Bar for V |
| where U::Image: IsU32 {} |
| |
| trait Foo { fn name() -> &'static str; } |
| impl Foo for u64 { fn name() -> &'static str { "u64" } } |
| impl<T: Bar> Foo for T { fn name() -> &'static str { "Bar" }} |
| |
| fn main() { |
| assert_eq!(<u64 as Foo>::name(), "u64"); |
| assert_eq!(<u32 as Foo>::name(), "Bar"); |
| } |
