error: this call to `map()` won't have an effect on the call to `count()` --> $DIR/suspicious_map.rs:4:13 | LL | let _ = (0..3).map(|x| x + 2).count(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `-D clippy::suspicious-map` implied by `-D warnings` = help: make sure you did not confuse `map` with `filter` error: aborting due to previous error