| // Copyright 2018 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. |
| |
| #![feature(existential_type)] |
| // compile-pass |
| |
| trait Bar {} |
| struct Dummy; |
| impl Bar for Dummy {} |
| |
| trait Foo { |
| type Assoc: Bar; |
| fn foo() -> Self::Assoc; |
| fn bar() -> Self::Assoc; |
| } |
| |
| existential type Helper: Bar; |
| |
| impl Foo for i32 { |
| type Assoc = Helper; |
| fn foo() -> Helper { |
| Dummy |
| } |
| fn bar() -> Helper { |
| Dummy |
| } |
| } |
| |
| fn main() {} |
