| // 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. |
| |
| use std::mem::size_of; |
| |
| // The main point of this test is to ensure that we can parse and resolve |
| // associated items on associated types. |
| |
| trait Foo { |
| type U; |
| } |
| |
| trait Bar { |
| // Note 1: Chains of associated items in a path won't type-check. |
| // Note 2: Associated consts can't depend on type parameters or `Self`, |
| // which are the only types that an associated type can be referenced on for |
| // now, so we can only test methods. |
| fn method() -> u32; |
| fn generic_method<T>() -> usize; |
| } |
| |
| struct MyFoo; |
| struct MyBar; |
| |
| impl Foo for MyFoo { |
| type U = MyBar; |
| } |
| |
| impl Bar for MyBar { |
| fn method() -> u32 { |
| 2u32 |
| } |
| fn generic_method<T>() -> usize { |
| size_of::<T>() |
| } |
| } |
| |
| fn foo<T>() |
| where T: Foo, |
| T::U: Bar, |
| { |
| assert_eq!(2u32, <T as Foo>::U::method()); |
| assert_eq!(8usize, <T as Foo>::U::generic_method::<f64>()); |
| } |
| |
| fn main() { |
| foo::<MyFoo>(); |
| } |