error: called `map(..).flatten()` on `Iterator` --> $DIR/map_flatten_fixable.rs:18:47 | LL | let _: Vec<_> = vec![5_i8; 6].into_iter().map(option_id).flatten().collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^ help: try replacing `map` with `filter_map` and remove the `.flatten()`: `filter_map(option_id)` | = note: `-D clippy::map-flatten` implied by `-D warnings` error: called `map(..).flatten()` on `Iterator` --> $DIR/map_flatten_fixable.rs:19:47 | LL | let _: Vec<_> = vec![5_i8; 6].into_iter().map(option_id_ref).flatten().collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try replacing `map` with `filter_map` and remove the `.flatten()`: `filter_map(option_id_ref)` error: called `map(..).flatten()` on `Iterator` --> $DIR/map_flatten_fixable.rs:20:47 | LL | let _: Vec<_> = vec![5_i8; 6].into_iter().map(option_id_closure).flatten().collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try replacing `map` with `filter_map` and remove the `.flatten()`: `filter_map(option_id_closure)` error: called `map(..).flatten()` on `Iterator` --> $DIR/map_flatten_fixable.rs:21:47 | LL | let _: Vec<_> = vec![5_i8; 6].into_iter().map(|x| x.checked_add(1)).flatten().collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try replacing `map` with `filter_map` and remove the `.flatten()`: `filter_map(|x| x.checked_add(1))` error: called `map(..).flatten()` on `Iterator` --> $DIR/map_flatten_fixable.rs:24:47 | LL | let _: Vec<_> = vec![5_i8; 6].into_iter().map(|x| 0..x).flatten().collect(); | ^^^^^^^^^^^^^^^^^^^^^^^ help: try replacing `map` with `flat_map` and remove the `.flatten()`: `flat_map(|x| 0..x)` error: called `map(..).flatten()` on `Option` --> $DIR/map_flatten_fixable.rs:27:40 | LL | let _: Option<_> = (Some(Some(1))).map(|x| x).flatten(); | ^^^^^^^^^^^^^^^^^^^^ help: try replacing `map` with `and_then` and remove the `.flatten()`: `and_then(|x| x)` error: called `map(..).flatten()` on `Result` --> $DIR/map_flatten_fixable.rs:30:42 | LL | let _: Result<_, &str> = (Ok(Ok(1))).map(|x| x).flatten(); | ^^^^^^^^^^^^^^^^^^^^ help: try replacing `map` with `and_then` and remove the `.flatten()`: `and_then(|x| x)` error: called `map(..).flatten()` on `Iterator` --> $DIR/map_flatten_fixable.rs:39:10 | LL | .map(|n| match n { | __________^ LL | | 1 => [n LL | | .saturating_add(1) LL | | .saturating_add(1) ... | LL | | }) LL | | .flatten(); | |__________________^ | help: try replacing `map` with `flat_map` and remove the `.flatten()` | LL ~ .flat_map(|n| match n { LL + 1 => [n LL + .saturating_add(1) LL + .saturating_add(1) LL + .saturating_add(1) LL + .saturating_add(1) LL + .saturating_add(1) LL + .saturating_add(1) LL + .saturating_add(1) LL + .saturating_add(1)], LL + n => [n], LL ~ }); | error: called `map(..).flatten()` on `Option` --> $DIR/map_flatten_fixable.rs:59:10 | LL | .map(|_| { | __________^ LL | | // we need some newlines LL | | // so that the span is big enough LL | | // for a split output of the diagnostic ... | LL | | }) LL | | .flatten(); | |__________________^ | help: try replacing `map` with `and_then` and remove the `.flatten()` | LL ~ .and_then(|_| { LL + // we need some newlines LL + // so that the span is big enough LL + // for a split output of the diagnostic LL + Some("") LL + // whitespace beforehand is important as well LL ~ }); | error: aborting due to 9 previous errors