1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
// 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.
macro_rules! overly_complicated (
($fnname:ident, $arg:ident, $ty:ty, $body:block, $val:expr, $pat:pat, $res:path) =>
({
fn $fnname($arg: $ty) -> Option<$ty> $body
match $fnname($val) {
Some($pat) => {
$res
}
_ => { fail!(); }
}
})
)
pub fn main() {
assert!(overly_complicated!(f, x, Option<uint>, { return Some(x); },
Some(8u), Some(y), y) == 8u)
}
|
