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1 // Copyright 2012 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
11 #![allow(unknown_features)]
12 #![feature(box_syntax)]
13 #![feature(unboxed_closures, core)]
14
15 struct closure_box<'a> {
16     cl: Box<FnMut() + 'a>,
17 }
18
19 fn box_it<'a>(x: Box<FnMut() + 'a>) -> closure_box<'a> {
20     closure_box {cl: x}
21 }
22
23 fn call_static_closure(mut cl: closure_box<'static>) {
24     cl.cl.call_mut(())
25 }
26
27 pub fn main() {
28     // FIXME (#22405): Replace `Box::new` with `box` here when/if possible.
29     let cl_box = box_it(Box::new(|| println!("Hello, world!")));
30     call_static_closure(cl_box);
31 }