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Spurious 'non-exhaustive patterns' error #15080

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@ebfe

Description

@ebfe

It looks like #14731 introduced a regression.

The following used to work:

fn main() {
    let mut x = &[1, 2, 3, 4];

    loop {
        x = match x {
            [1, n, 3, ..rest] => {
                println!("1, {}, 3", n); 
                rest
            }
            [n, ..rest] => {
                println!("{}", n);
                rest
            }
            [] =>
                break
        }
    }
}

but now generates the following error:

t.rs:5:13: 16:10 error: non-exhaustive patterns: `[_, _]` not covered
t.rs:5         x = match x {
t.rs:6             [1, n, 3, ..rest] => {
t.rs:7                 println!("1, {}, 3", n); 
t.rs:8                 rest
t.rs:9             }
t.rs:10             [n, ..rest] => {
        ...
error: aborting due to previous error

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