unused or repeated assign to the same index

[bingmatv]

What it does

To detect whether the index is the same and whether there's unused or repeated assign.

Advantage

No response

Drawbacks

No response

Example

fn main() {
    let mut a = [0u8; 8];
    a[0] = 1;
    a[0] = 1;
    a[0..3].copy_from_slice(&[1; 3]);
}

Clippy didn't warn there are repeated assign to the index 0.