error: use of `filter_map` with an identity function
  --> $DIR/filter_map_identity.rs:8:22
   |
LL |     let _ = iterator.filter_map(|x| x);
   |                      ^^^^^^^^^^^^^^^^^ help: try: `flatten()`
   |
   = note: `-D clippy::filter-map-identity` implied by `-D warnings`

error: use of `filter_map` with an identity function
  --> $DIR/filter_map_identity.rs:11:22
   |
LL |     let _ = iterator.filter_map(std::convert::identity);
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `flatten()`

error: use of `filter_map` with an identity function
  --> $DIR/filter_map_identity.rs:15:22
   |
LL |     let _ = iterator.filter_map(identity);
   |                      ^^^^^^^^^^^^^^^^^^^^ help: try: `flatten()`

error: use of `filter_map` with an identity function
  --> $DIR/filter_map_identity.rs:18:22
   |
LL |     let _ = iterator.filter_map(|x| return x);
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `flatten()`

error: aborting due to 4 previous errors