1 // Copyright 2015 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.
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.
11 // Regression test for #20831: debruijn index account was thrown off
12 // by the (anonymous) lifetime in `<Self as Publisher>::Output`
13 // below. Note that changing to a named lifetime made the problem go
16 use std::cell::RefCell;
17 use std::marker::MarkerTrait;
18 use std::ops::{Shl, Shr};
20 pub trait Subscriber : MarkerTrait {
24 pub trait Publisher<'a> {
26 fn subscribe(&mut self, Box<Subscriber<Input=Self::Output> + 'a>);
29 pub trait Processor<'a> : Subscriber + Publisher<'a> { }
31 impl<'a, P> Processor<'a> for P where P : Subscriber + Publisher<'a> { }
34 sub: Box<Subscriber<Input=u64> + 'a>
37 impl<'a> Publisher<'a> for MyStruct<'a> {
39 fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {
40 // Not obvious, but there is an implicit lifetime here -------^
41 //~^^ ERROR cannot infer
43 // The fact that `Publisher` is using an implicit lifetime is
44 // what was causing the debruijn accounting to be off, so