I am a Rust beginner. here is the complete code:

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

    // Fill in the blank to make the code work
    assert_eq!([x, y], [3, 2]);
}

Why does

[.., y] = [1, 2];
error: pattern requires 1 element but array has 2
rust-analyzer E0527

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