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1 | // Copyright 2013 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | // Test that we are able to compile calls to associated fns like | |
12 | // `decode()` where the bound on the `Self` parameter references a | |
13 | // lifetime parameter of the trait. This example indicates why trait | |
14 | // lifetime parameters must be early bound in the type of the | |
15 | // associated item. | |
16 | ||
c34b1796 AL |
17 | // pretty-expanded FIXME #23616 |
18 | ||
85aaf69f SL |
19 | use std::marker; |
20 | ||
1a4d82fc JJ |
21 | pub enum Value<'v> { |
22 | A(&'v str), | |
23 | B, | |
24 | } | |
25 | ||
26 | pub trait Decoder<'v> { | |
27 | fn read(&mut self) -> Value<'v>; | |
28 | } | |
29 | ||
85aaf69f | 30 | pub trait Decodable<'v, D: Decoder<'v>> |
c34b1796 | 31 | : marker::PhantomFn<(), &'v isize> |
85aaf69f | 32 | { |
1a4d82fc JJ |
33 | fn decode(d: &mut D) -> Self; |
34 | } | |
35 | ||
36 | impl<'v, D: Decoder<'v>> Decodable<'v, D> for () { | |
37 | fn decode(d: &mut D) -> () { | |
38 | match d.read() { | |
39 | Value::A(..) => (), | |
40 | Value::B => Decodable::decode(d), | |
41 | } | |
42 | } | |
43 | } | |
44 | ||
45 | pub fn main() { } |