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.
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 // Checks that higher-ranked extern fn pointers implement the full range of Fn traits.
13 // pretty-expanded FIXME #23616
15 #![feature(unboxed_closures, core)]
17 use std::ops::{Fn,FnMut,FnOnce};
19 fn square(x: &int) -> int { (*x) * (*x) }
21 fn call_it<F:Fn(&int)->int>(f: &F, x: int) -> int {
25 fn call_it_boxed(f: &Fn(&int) -> int, x: int) -> int {
29 fn call_it_mut<F:FnMut(&int)->int>(f: &mut F, x: int) -> int {
33 fn call_it_once<F:FnOnce(&int)->int>(f: F, x: int) -> int {
38 let x = call_it(&square, 22);
39 let x1 = call_it_boxed(&square, 22);
40 let y = call_it_mut(&mut square, 22);
41 let z = call_it_once(square, 22);
42 assert_eq!(x, square(&22));
43 assert_eq!(x1, square(&22));
44 assert_eq!(y, square(&22));
45 assert_eq!(z, square(&22));