error: called `map(..).flatten()` on `Option` --> tests/ui/map_flatten.rs:8:10 | LL | .map(|x| { | __________^ LL | | LL | | LL | | if x <= 5 { ... | LL | | }) LL | | .flatten(); | |__________________^ | = note: `-D clippy::map-flatten` implied by `-D warnings` = help: to override `-D warnings` add `#[allow(clippy::map_flatten)]` help: try replacing `map` with `and_then` and remove the `.flatten()` | LL ~ .and_then(|x| { LL + LL + LL + if x <= 5 { LL + Some(x) LL + } else { LL + None LL + } LL ~ }); | error: called `map(..).flatten()` on `Result` --> tests/ui/map_flatten.rs:20:10 | LL | .map(|x| { | __________^ LL | | LL | | if x == 1 { LL | | Ok(x) ... | LL | | }) LL | | .flatten(); | |__________________^ | help: try replacing `map` with `and_then` and remove the `.flatten()` | LL ~ .and_then(|x| { LL + LL + if x == 1 { LL + Ok(x) LL + } else { LL + Err(0) LL + } LL ~ }); | error: called `map(..).flatten()` on `Result` --> tests/ui/map_flatten.rs:33:10 | LL | .map(|res| { | __________^ LL | | LL | | if res > 0 { LL | | do_something(); ... | LL | | }) LL | | .flatten(); | |__________________^ | help: try replacing `map` with `and_then` and remove the `.flatten()` | LL ~ .and_then(|res| { LL + LL + if res > 0 { LL + do_something(); LL + Ok(res) LL + } else { LL + Err(0) LL + } LL ~ }); | error: called `map(..).flatten()` on `Iterator` --> tests/ui/map_flatten.rs:46:10 | LL | .map(|some_value| { | __________^ LL | | LL | | if some_value > 3 { LL | | Some(some_value) ... | LL | | }) LL | | .flatten() | |__________________^ | help: try replacing `map` with `filter_map` and remove the `.flatten()` | LL ~ .filter_map(|some_value| { LL + LL + if some_value > 3 { LL + Some(some_value) LL + } else { LL + None LL + } LL + }) | error: aborting due to 4 previous errors