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#![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.flat_map(|x| x);
let iterator = [[0, 1], [2, 3], [4, 5]].iter();
let _ = iterator.flat_map(convert::identity);
let iterator = [[0, 1], [2, 3], [4, 5]].iter();
let _ = iterator.flat_map(|x| return x);
}
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