| // Copyright 2017 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. |
| |
| #![feature(rustc_attrs, associated_type_defaults)] |
| #![allow(warnings)] |
| |
| trait State: Sized { |
| type NextState: State = StateMachineEnded; |
| fn execute(self) -> Option<Self::NextState>; |
| } |
| |
| struct StateMachineEnded; |
| |
| impl State for StateMachineEnded { |
| fn execute(self) -> Option<Self::NextState> { |
| None |
| } |
| } |
| |
| #[rustc_error] |
| fn main() { //~ ERROR compilation successful |
| } |
