error: avoid using `collect()` when not needed --> $DIR/needless_collect_indirect.rs:5:39 | LL | let indirect_iter = sample.iter().collect::>(); | ^^^^^^^ LL | indirect_iter.into_iter().map(|x| (x, x + 1)).collect::>(); | ------------------------- the iterator could be used here instead | = note: `-D clippy::needless-collect` implied by `-D warnings` help: use the original Iterator instead of collecting it and then producing a new one | LL | LL | sample.iter().map(|x| (x, x + 1)).collect::>(); | error: avoid using `collect()` when not needed --> $DIR/needless_collect_indirect.rs:7:38 | LL | let indirect_len = sample.iter().collect::>(); | ^^^^^^^ LL | indirect_len.len(); | ------------------ the iterator could be used here instead | help: take the original Iterator's count instead of collecting it and finding the length | LL | LL | sample.iter().count(); | error: avoid using `collect()` when not needed --> $DIR/needless_collect_indirect.rs:9:40 | LL | let indirect_empty = sample.iter().collect::>(); | ^^^^^^^ LL | indirect_empty.is_empty(); | ------------------------- the iterator could be used here instead | help: check if the original Iterator has anything instead of collecting it and seeing if it's empty | LL | LL | sample.iter().next().is_none(); | error: avoid using `collect()` when not needed --> $DIR/needless_collect_indirect.rs:11:43 | LL | let indirect_contains = sample.iter().collect::>(); | ^^^^^^^ LL | indirect_contains.contains(&&5); | ------------------------------- the iterator could be used here instead | help: check if the original Iterator contains an element instead of collecting then checking | LL | LL | sample.iter().any(|x| x == &5); | error: avoid using `collect()` when not needed --> $DIR/needless_collect_indirect.rs:23:48 | LL | let non_copy_contains = sample.into_iter().collect::>(); | ^^^^^^^ LL | non_copy_contains.contains(&a); | ------------------------------ the iterator could be used here instead | help: check if the original Iterator contains an element instead of collecting then checking | LL | LL | sample.into_iter().any(|x| x == a); | error: aborting due to 5 previous errors