error: called `flat_map(|x| x)` on an `Iterator` --> $DIR/unnecessary_flat_map.rs:10:22 | LL | let _ = iterator.flat_map(|x| x); | ^^^^^^^^^^^^^^^ help: try: `flatten()` | = note: `-D clippy::flat-map-identity` implied by `-D warnings` error: called `flat_map(std::convert::identity)` on an `Iterator` --> $DIR/unnecessary_flat_map.rs:13:22 | LL | let _ = iterator.flat_map(convert::identity); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `flatten()` error: aborting due to 2 previous errors