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1 | // Copyright 2014 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. | |
4 | // | |
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. | |
10 | ||
476ff2be | 11 | #![feature(fn_traits, unboxed_closures)] |
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12 | |
13 | use std::{fmt, ops}; | |
14 | ||
85aaf69f | 15 | struct Debuger<T> { |
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16 | x: T |
17 | } | |
18 | ||
c34b1796 | 19 | impl<T: fmt::Debug> ops::FnOnce<(),> for Debuger<T> { |
85aaf69f | 20 | type Output = (); |
c34b1796 | 21 | fn call_once(self, _args: ()) { |
c1a9b12d | 22 | //~^ ERROR `call_once` has an incompatible type for trait |
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23 | //~| expected type `extern "rust-call" fn |
24 | //~| found type `fn | |
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25 | println!("{:?}", self.x); |
26 | } | |
27 | } | |
28 | ||
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29 | fn make_shower<T>(x: T) -> Debuger<T> { |
30 | Debuger { x: x } | |
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31 | } |
32 | ||
33 | pub fn main() { | |
85aaf69f | 34 | let show3 = make_shower(3); |
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35 | show3(); |
36 | } |