#![allow(unused_imports, clippy::needless_return)]
#![warn(clippy::flat_map_identity)]

use std::convert;

fn main() {
    let iterator = [[0, 1], [2, 3], [4, 5]].iter();
    let _ = iterator.flatten();

    let iterator = [[0, 1], [2, 3], [4, 5]].iter();
    let _ = iterator.flatten();

    let iterator = [[0, 1], [2, 3], [4, 5]].iter();
    let _ = iterator.flatten();
}