1 // Copyright 2015 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.
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.
11 #![feature(unboxed_closures)]
16 impl<F, T> FnOnce<(T,)> for Fun<F> where F: Fn(T) -> T {
19 extern "rust-call" fn call_once(self, (t,): (T,)) -> T {
25 let fun = Fun(|i: isize| i * 2);
26 println!("{}", fun(3));