| // Copyright 2014 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. |
| |
| |
| pub fn increment(x: usize) -> usize { |
| x + 1 |
| } |
| |
| #[macro_export] |
| macro_rules! increment { |
| ($x:expr) => ({ |
| use $crate::increment; |
| increment($x) |
| }) |
| } |
| |
| fn main() { |
| assert_eq!(increment!(3), 4); |
| } |
