31 lines
958 B
Rust
31 lines
958 B
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#[feature(macro_rules)];
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macro_rules! overly_complicated (
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($fnname:ident, $arg:ident, $ty:ty, $body:block, $val:expr, $pat:pat, $res:path) =>
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({
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fn $fnname($arg: $ty) -> Option<$ty> $body
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match $fnname($val) {
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Some($pat) => {
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$res
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}
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_ => { fail!(); }
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}
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})
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)
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pub fn main() {
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assert!(overly_complicated!(f, x, Option<uint>, { return Some(x); },
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Some(8u), Some(y), y) == 8u)
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}
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