rust/src/test/run-pass/vec-matching-legal-tail-element-borrow.rs

fn main() {
    let x = &[1, 2, 3, 4, 5];
    if !x.is_empty() {
        let el = match x {
            [1, ..ref tail] => &tail[0], 
            _ => core::util::unreachable()
        };
        io::println(fmt!("%d", *el));
    }
}