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 pub trait Paramters { type SelfRef; }
13 struct RP<'a> { _marker: std::marker::PhantomData<&'a ()> }
16 impl<'a> Paramters for RP<'a> { type SelfRef = &'a X<RP<'a>>; }
17 impl Paramters for BP { type SelfRef = Box<X<BP>>; }
20 pub enum X<P: Paramters> {
22 SameAgain(P::SelfRef, Y)
26 let bnil: Box<X<BP>> = Box::new(X::Nothing);
27 let bx: Box<X<BP>> = Box::new(X::SameAgain(bnil, Y));
28 let rnil: X<RP> = X::Nothing;
29 let rx: X<RP> = X::SameAgain(&rnil, Y);