error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:45:5 | LL | btree_map = btree_map.into_iter().filter(|(k, _)| k % 2 == 0).collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.retain()` instead: `btree_map.retain(|k, _| k % 2 == 0)` | = note: `-D clippy::use-retain` implied by `-D warnings` error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:46:5 | LL | btree_map = btree_map.into_iter().filter(|(_, v)| v % 2 == 0).collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.retain()` instead: `btree_map.retain(|_, &mut v| v % 2 == 0)` error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:47:5 | LL | / btree_map = btree_map LL | | .into_iter() LL | | .filter(|(k, v)| (k % 2 == 0) && (v % 2 == 0)) LL | | .collect(); | |__________________^ help: consider calling `.retain()` instead: `btree_map.retain(|k, &mut v| (k % 2 == 0) && (v % 2 == 0))` error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:69:5 | LL | btree_set = btree_set.iter().filter(|&x| x % 2 == 0).copied().collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.retain()` instead: `btree_set.retain(|x| x % 2 == 0)` error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:70:5 | LL | btree_set = btree_set.into_iter().filter(|x| x % 2 == 0).collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.retain()` instead: `btree_set.retain(|x| x % 2 == 0)` error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:93:5 | LL | hash_map = hash_map.into_iter().filter(|(k, _)| k % 2 == 0).collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.retain()` instead: `hash_map.retain(|k, _| k % 2 == 0)` error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:94:5 | LL | hash_map = hash_map.into_iter().filter(|(_, v)| v % 2 == 0).collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.retain()` instead: `hash_map.retain(|_, &mut v| v % 2 == 0)` error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:95:5 | LL | / hash_map = hash_map LL | | .into_iter() LL | | .filter(|(k, v)| (k % 2 == 0) && (v % 2 == 0)) LL | | .collect(); | |__________________^ help: consider calling `.retain()` instead: `hash_map.retain(|k, &mut v| (k % 2 == 0) && (v % 2 == 0))` error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:116:5 | LL | hash_set = hash_set.into_iter().filter(|x| x % 2 == 0).collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.retain()` instead: `hash_set.retain(|x| x % 2 == 0)` error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:117:5 | LL | hash_set = hash_set.iter().filter(|&x| x % 2 == 0).copied().collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.retain()` instead: `hash_set.retain(|x| x % 2 == 0)` error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:139:5 | LL | s = s.chars().filter(|&c| c != 'o').to_owned().collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.retain()` instead: `s.retain(|c| c != 'o')` error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:151:5 | LL | vec = vec.iter().filter(|&x| x % 2 == 0).copied().collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.retain()` instead: `vec.retain(|x| x % 2 == 0)` error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:152:5 | LL | vec = vec.into_iter().filter(|x| x % 2 == 0).collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.retain()` instead: `vec.retain(|x| x % 2 == 0)` error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:172:5 | LL | vec_deque = vec_deque.iter().filter(|&x| x % 2 == 0).copied().collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.retain()` instead: `vec_deque.retain(|x| x % 2 == 0)` error: this expression can be written more simply using `.retain()` --> $DIR/use_retain.rs:173:5 | LL | vec_deque = vec_deque.into_iter().filter(|x| x % 2 == 0).collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.retain()` instead: `vec_deque.retain(|x| x % 2 == 0)` error: aborting due to 15 previous errors