rust/src/test/run-pass/issue-8498.rs

// Copyright 2013 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.

#![allow(unknown_features)]
#![feature(box_syntax)]

pub fn main() {
    match &[(box 5,box 7)] {
        ps => {
           let (ref y, _) = ps[0];
           assert!(**y == 5);
        }
    }

    match Some(&[(box 5,)]) {
        Some(ps) => {
           let (ref y,) = ps[0];
           assert!(**y == 5);
        }
        None => ()
    }

    match Some(&[(box 5,box 7)]) {
        Some(ps) => {
           let (ref y, ref z) = ps[0];
           assert!(**y == 5);
           assert!(**z == 7);
        }
        None => ()
    }
}