51 lines
1.1 KiB
Rust
51 lines
1.1 KiB
Rust
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(specialization)]
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fn main() {}
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pub trait Alpha<T> { }
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pub trait Beta {
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type Event;
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}
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pub trait Delta {
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type Handle;
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fn process(&self);
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}
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pub struct Parent<A, T>(A, T);
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impl<A, T> Delta for Parent<A, T>
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where A: Alpha<T::Handle>,
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T: Delta,
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T::Handle: Beta<Event = <Handle as Beta>::Event> {
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type Handle = Handle;
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default fn process(&self) {
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unimplemented!()
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}
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}
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impl<A, T> Delta for Parent<A, T>
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where A: Alpha<T::Handle> + Alpha<Handle>,
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T: Delta,
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T::Handle: Beta<Event = <Handle as Beta>::Event> {
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fn process(&self) {
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unimplemented!()
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}
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}
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pub struct Handle;
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impl Beta for Handle {
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type Event = ();
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}
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