| // 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. |
| |
| trait MapLookup<Q> { |
| type MapValue; |
| } |
| |
| impl<K> MapLookup<K> for K { |
| type MapValue = K; |
| } |
| |
| trait Map: MapLookup<<Self as Map>::Key> { |
| type Key; |
| } |
| |
| impl<K> Map for K { |
| type Key = K; |
| } |
| |
| |
| fn main() { |
| let _ = &() |
| as &Map<Key=u32,MapValue=u32>; |
| //~^ ERROR the trait `Map` cannot be made into an object |
| //~| NOTE the trait cannot use `Self` as a type parameter |
| } |
