rust-clippy/tests/ui/needless_collect_indirect.stderr

error: avoid using `collect()` when not needed
  --> $DIR/needless_collect_indirect.rs:5:5
   |
LL | /     let indirect_iter = sample.iter().collect::<Vec<_>>();
LL | |     indirect_iter.into_iter().map(|x| (x, x + 1)).collect::<HashMap<_, _>>();
   | |____^
   |
   = 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::<HashMap<_, _>>();
   |

error: avoid using `collect()` when not needed
  --> $DIR/needless_collect_indirect.rs:7:5
   |
LL | /     let indirect_len = sample.iter().collect::<VecDeque<_>>();
LL | |     indirect_len.len();
   | |____^
   |
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:9:5
   |
LL | /     let indirect_empty = sample.iter().collect::<VecDeque<_>>();
LL | |     indirect_empty.is_empty();
   | |____^
   |
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:11:5
   |
LL | /     let indirect_contains = sample.iter().collect::<VecDeque<_>>();
LL | |     indirect_contains.contains(&&5);
   | |____^
   |
help: Check if the original Iterator contains an element instead of collecting then checking
   |
LL |     
LL |     sample.iter().any(|x| x == &&5);
   |

error: aborting due to 4 previous errors