| // Copyright 2014 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(unboxed_closures)] |
| |
| use std::{fmt, ops}; |
| |
| struct Debuger<T> { |
| x: T |
| } |
| |
| impl<T: fmt::Debug> ops::FnOnce<(),> for Debuger<T> { |
| type Output = (); |
| fn call_once(self, _args: ()) { |
| //~^ ERROR `call_once` has an incompatible type for trait |
| //~| expected "rust-call" fn, |
| //~| found "Rust" fn |
| println!("{:?}", self.x); |
| } |
| } |
| |
| fn make_shower<T>(x: T) -> Debuger<T> { |
| Debuger { x: x } |
| } |
| |
| pub fn main() { |
| let show3 = make_shower(3); |
| show3(); |
| } |
