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1a4d82fc | 1 | // Copyright 2015 The Rust Project Developers. See the COPYRIGHT |
223e47cc LB |
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 | ||
b7449926 | 11 | // run-pass |
c1a9b12d | 12 | #![feature(unboxed_closures)] |
92a42be0 | 13 | #![feature(fn_traits)] |
85aaf69f | 14 | |
c1a9b12d | 15 | struct Fun<F>(F); |
223e47cc | 16 | |
c1a9b12d SL |
17 | impl<F, T> FnOnce<(T,)> for Fun<F> where F: Fn(T) -> T { |
18 | type Output = T; | |
19 | ||
20 | extern "rust-call" fn call_once(self, (t,): (T,)) -> T { | |
21 | (self.0)(t) | |
22 | } | |
23 | } | |
24 | ||
25 | fn main() { | |
26 | let fun = Fun(|i: isize| i * 2); | |
27 | println!("{}", fun(3)); | |
28 | } |