| // Copyright 2013 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 are able to compile calls to associated fns like |
| // `decode()` where the bound on the `Self` parameter references a |
| // lifetime parameter of the trait. This example indicates why trait |
| // lifetime parameters must be early bound in the type of the |
| // associated item. |
| |
| // pretty-expanded FIXME #23616 |
| |
| use std::marker; |
| |
| pub enum Value<'v> { |
| A(&'v str), |
| B, |
| } |
| |
| pub trait Decoder<'v> { |
| fn read(&mut self) -> Value<'v>; |
| } |
| |
| pub trait Decodable<'v, D: Decoder<'v>> { |
| fn decode(d: &mut D) -> Self; |
| } |
| |
| impl<'v, D: Decoder<'v>> Decodable<'v, D> for () { |
| fn decode(d: &mut D) -> () { |
| match d.read() { |
| Value::A(..) => (), |
| Value::B => Decodable::decode(d), |
| } |
| } |
| } |
| |
| pub fn main() { } |