File: issue-12369.rs

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rustc 1.88.0%2Bdfsg1-1
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#![deny(unreachable_patterns)]

fn main() {
    let sl = vec![1,2,3];
    let v: isize = match &*sl {
        &[] => 0,
        &[a,b,c] => 3,
        &[a, ref rest @ ..] => a,
        &[10,a, ref rest @ ..] => 10 //~ ERROR: unreachable pattern
    };
}