error: avoid using `collect()` when not needed --> $DIR/needless_collect.rs:16:28 | LL | let len = sample.iter().collect::>().len(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `.count()` | = note: `-D clippy::needless-collect` implied by `-D warnings` error: avoid using `collect()` when not needed --> $DIR/needless_collect.rs:17:21 | LL | if sample.iter().collect::>().is_empty() { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `.next().is_none()` error: avoid using `collect()` when not needed --> $DIR/needless_collect.rs:20:27 | LL | sample.iter().cloned().collect::>().contains(&1); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `.any(|&x| x == 1)` error: avoid using `collect()` when not needed --> $DIR/needless_collect.rs:21:34 | LL | sample.iter().map(|x| (x, x)).collect::>().len(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `.count()` error: aborting due to 4 previous errors