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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![feature(unboxed_closures, core)]
use std::ops::FnMut;
struct S {
x: i32,
y: i32,
}
impl FnMut<()> for S {
extern "rust-call" fn call_mut(&mut self, (): ()) -> i32 {
self.x * self.y
}
}
impl FnOnce<()> for S {
type Output = i32;
extern "rust-call" fn call_once(mut self, args: ()) -> i32 { self.call_mut(args) }
}
fn main() {
let mut s = S {
x: 3,
y: 3,
};
let ans = s();
assert_eq!(ans, 9);
}
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