unnecessary_conversion_for_trait false positive

[smoelius]

unnecessary_conversion_for_trait recommends to remove the iter in the call to extend. But then xs would be unavailable for the call to println!.

fn main() {
    let xs = vec![[0u8; 16]];
    let mut ys: Vec<[u8; 16]> = Vec::new();
    ys.extend(xs.iter());
    //          ^^^^^^^
    println!("{:?}", xs);
}