error: avoid using `collect()` when not needed --> $DIR/needless_collect.rs:11:29 | 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:12:22 | LL | if sample.iter().collect::>().is_empty() { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `next().is_none()` error: avoid using `collect()` when not needed --> $DIR/needless_collect.rs:15:28 | 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:16:35 | LL | sample.iter().map(|x| (x, x)).collect::>().len(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `count()` error: aborting due to 4 previous errors