rust/src/test/compile-fail/issue-15381.rs

// 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.

#![feature(slice_patterns)]

fn main() {
    let values: Vec<u8> = vec![1,2,3,4,5,6,7,8];

    for &[x,y,z] in values.chunks(3).filter(|&xs| xs.len() == 3) {
        //~^ ERROR refutable pattern in `for` loop binding: `&[]` not covered
        println!("y={}", y);
    }
}