rust-clippy/tests/ui/for_loop.stderr

error: the loop variable `i` is only used to index `vec`.
  --> $DIR/for_loop.rs:38:14
   |
38 |     for i in 0..vec.len() {
   |              ^^^^^^^^^^^^
   |
   = note: `-D clippy::needless-range-loop` implied by `-D warnings`
help: consider using an iterator
   |
38 |     for <item> in &vec {
   |         ^^^^^^    ^^^^

error: the loop variable `i` is only used to index `vec`.
  --> $DIR/for_loop.rs:47:14
   |
47 |     for i in 0..vec.len() {
   |              ^^^^^^^^^^^^
help: consider using an iterator
   |
47 |     for <item> in &vec {
   |         ^^^^^^    ^^^^

error: the loop variable `j` is only used to index `STATIC`.
  --> $DIR/for_loop.rs:52:14
   |
52 |     for j in 0..4 {
   |              ^^^^
help: consider using an iterator
   |
52 |     for <item> in &STATIC {
   |         ^^^^^^    ^^^^^^^

error: the loop variable `j` is only used to index `CONST`.
  --> $DIR/for_loop.rs:56:14
   |
56 |     for j in 0..4 {
   |              ^^^^
help: consider using an iterator
   |
56 |     for <item> in &CONST {
   |         ^^^^^^    ^^^^^^

error: the loop variable `i` is used to index `vec`
  --> $DIR/for_loop.rs:60:14
   |
60 |     for i in 0..vec.len() {
   |              ^^^^^^^^^^^^
help: consider using an iterator
   |
60 |     for (i, <item>) in vec.iter().enumerate() {
   |         ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is only used to index `vec2`.
  --> $DIR/for_loop.rs:68:14
   |
68 |     for i in 0..vec.len() {
   |              ^^^^^^^^^^^^
help: consider using an iterator
   |
68 |     for <item> in vec2.iter().take(vec.len()) {
   |         ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is only used to index `vec`.
  --> $DIR/for_loop.rs:72:14
   |
72 |     for i in 5..vec.len() {
   |              ^^^^^^^^^^^^
help: consider using an iterator
   |
72 |     for <item> in vec.iter().skip(5) {
   |         ^^^^^^    ^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is only used to index `vec`.
  --> $DIR/for_loop.rs:76:14
   |
76 |     for i in 0..MAX_LEN {
   |              ^^^^^^^^^^
help: consider using an iterator
   |
76 |     for <item> in vec.iter().take(MAX_LEN) {
   |         ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is only used to index `vec`.
  --> $DIR/for_loop.rs:80:14
   |
80 |     for i in 0..=MAX_LEN {
   |              ^^^^^^^^^^^
help: consider using an iterator
   |
80 |     for <item> in vec.iter().take(MAX_LEN + 1) {
   |         ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is only used to index `vec`.
  --> $DIR/for_loop.rs:84:14
   |
84 |     for i in 5..10 {
   |              ^^^^^
help: consider using an iterator
   |
84 |     for <item> in vec.iter().take(10).skip(5) {
   |         ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is only used to index `vec`.
  --> $DIR/for_loop.rs:88:14
   |
88 |     for i in 5..=10 {
   |              ^^^^^^
help: consider using an iterator
   |
88 |     for <item> in vec.iter().take(10 + 1).skip(5) {
   |         ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is used to index `vec`
  --> $DIR/for_loop.rs:92:14
   |
92 |     for i in 5..vec.len() {
   |              ^^^^^^^^^^^^
help: consider using an iterator
   |
92 |     for (i, <item>) in vec.iter().enumerate().skip(5) {
   |         ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is used to index `vec`
  --> $DIR/for_loop.rs:96:14
   |
96 |     for i in 5..10 {
   |              ^^^^^
help: consider using an iterator
   |
96 |     for (i, <item>) in vec.iter().enumerate().take(10).skip(5) {
   |         ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: this range is empty so this for loop will never run
   --> $DIR/for_loop.rs:100:14
    |
100 |     for i in 10..0 {
    |              ^^^^^
    |
    = note: `-D clippy::reverse-range-loop` implied by `-D warnings`
help: consider using the following if you are attempting to iterate over this range in reverse
    |
100 |     for i in (0..10).rev() {
    |              ^^^^^^^^^^^^^

error: this range is empty so this for loop will never run
   --> $DIR/for_loop.rs:104:14
    |
104 |     for i in 10..=0 {
    |              ^^^^^^
help: consider using the following if you are attempting to iterate over this range in reverse
    |
104 |     for i in (0...10).rev() {
    |              ^^^^^^^^^^^^^^

error: this range is empty so this for loop will never run
   --> $DIR/for_loop.rs:108:14
    |
108 |     for i in MAX_LEN..0 {
    |              ^^^^^^^^^^
help: consider using the following if you are attempting to iterate over this range in reverse
    |
108 |     for i in (0..MAX_LEN).rev() {
    |              ^^^^^^^^^^^^^^^^^^

error: this range is empty so this for loop will never run
   --> $DIR/for_loop.rs:112:14
    |
112 |     for i in 5..5 {
    |              ^^^^

error: this range is empty so this for loop will never run
   --> $DIR/for_loop.rs:137:14
    |
137 |     for i in 10..5 + 4 {
    |              ^^^^^^^^^
help: consider using the following if you are attempting to iterate over this range in reverse
    |
137 |     for i in (5 + 4..10).rev() {
    |              ^^^^^^^^^^^^^^^^^

error: this range is empty so this for loop will never run
   --> $DIR/for_loop.rs:141:14
    |
141 |     for i in (5 + 2)..(3 - 1) {
    |              ^^^^^^^^^^^^^^^^
help: consider using the following if you are attempting to iterate over this range in reverse
    |
141 |     for i in ((3 - 1)..(5 + 2)).rev() {
    |              ^^^^^^^^^^^^^^^^^^^^^^^^

error: this range is empty so this for loop will never run
   --> $DIR/for_loop.rs:145:14
    |
145 |     for i in (5 + 2)..(8 - 1) {
    |              ^^^^^^^^^^^^^^^^

error: it is more concise to loop over references to containers instead of using explicit iteration methods
   --> $DIR/for_loop.rs:167:15
    |
167 |     for _v in vec.iter() {}
    |               ^^^^^^^^^^ help: to write this more concisely, try: `&vec`
    |
    = note: `-D clippy::explicit-iter-loop` implied by `-D warnings`

error: it is more concise to loop over references to containers instead of using explicit iteration methods
   --> $DIR/for_loop.rs:169:15
    |
169 |     for _v in vec.iter_mut() {}
    |               ^^^^^^^^^^^^^^ help: to write this more concisely, try: `&mut vec`

error: it is more concise to loop over containers instead of using explicit iteration methods`
   --> $DIR/for_loop.rs:172:15
    |
172 |     for _v in out_vec.into_iter() {}
    |               ^^^^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `out_vec`
    |
    = note: `-D clippy::explicit-into-iter-loop` implied by `-D warnings`

error: it is more concise to loop over references to containers instead of using explicit iteration methods
   --> $DIR/for_loop.rs:175:15
    |
175 |     for _v in array.into_iter() {}
    |               ^^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `&array`

error: it is more concise to loop over references to containers instead of using explicit iteration methods
   --> $DIR/for_loop.rs:180:15
    |
180 |     for _v in [1, 2, 3].iter() {}
    |               ^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `&[1, 2, 3]`

error: it is more concise to loop over references to containers instead of using explicit iteration methods
   --> $DIR/for_loop.rs:184:15
    |
184 |     for _v in [0; 32].iter() {}
    |               ^^^^^^^^^^^^^^ help: to write this more concisely, try: `&[0; 32]`

error: it is more concise to loop over references to containers instead of using explicit iteration methods
   --> $DIR/for_loop.rs:189:15
    |
189 |     for _v in ll.iter() {}
    |               ^^^^^^^^^ help: to write this more concisely, try: `&ll`

error: it is more concise to loop over references to containers instead of using explicit iteration methods
   --> $DIR/for_loop.rs:192:15
    |
192 |     for _v in vd.iter() {}
    |               ^^^^^^^^^ help: to write this more concisely, try: `&vd`

error: it is more concise to loop over references to containers instead of using explicit iteration methods
   --> $DIR/for_loop.rs:195:15
    |
195 |     for _v in bh.iter() {}
    |               ^^^^^^^^^ help: to write this more concisely, try: `&bh`

error: it is more concise to loop over references to containers instead of using explicit iteration methods
   --> $DIR/for_loop.rs:198:15
    |
198 |     for _v in hm.iter() {}
    |               ^^^^^^^^^ help: to write this more concisely, try: `&hm`

error: it is more concise to loop over references to containers instead of using explicit iteration methods
   --> $DIR/for_loop.rs:201:15
    |
201 |     for _v in bt.iter() {}
    |               ^^^^^^^^^ help: to write this more concisely, try: `&bt`

error: it is more concise to loop over references to containers instead of using explicit iteration methods
   --> $DIR/for_loop.rs:204:15
    |
204 |     for _v in hs.iter() {}
    |               ^^^^^^^^^ help: to write this more concisely, try: `&hs`

error: it is more concise to loop over references to containers instead of using explicit iteration methods
   --> $DIR/for_loop.rs:207:15
    |
207 |     for _v in bs.iter() {}
    |               ^^^^^^^^^ help: to write this more concisely, try: `&bs`

error: you are iterating over `Iterator::next()` which is an Option; this will compile but is probably not what you want
   --> $DIR/for_loop.rs:209:15
    |
209 |     for _v in vec.iter().next() {}
    |               ^^^^^^^^^^^^^^^^^
    |
    = note: `-D clippy::iter-next-loop` implied by `-D warnings`

error: you are collect()ing an iterator and throwing away the result. Consider using an explicit for loop to exhaust the iterator
   --> $DIR/for_loop.rs:216:5
    |
216 |     vec.iter().cloned().map(|x| out.push(x)).collect::<Vec<_>>();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D clippy::unused-collect` implied by `-D warnings`

error: you seem to want to iterate on a map's values
   --> $DIR/for_loop.rs:325:19
    |
325 |     for (_, v) in &m {
    |                   ^^
    |
    = note: `-D clippy::for-kv-map` implied by `-D warnings`
help: use the corresponding method
    |
325 |     for v in m.values() {
    |         ^    ^^^^^^^^^^

error: you seem to want to iterate on a map's values
   --> $DIR/for_loop.rs:330:19
    |
330 |     for (_, v) in &*m {
    |                   ^^^
help: use the corresponding method
    |
330 |     for v in (*m).values() {
    |         ^    ^^^^^^^^^^^^^

error: you seem to want to iterate on a map's values
   --> $DIR/for_loop.rs:338:19
    |
338 |     for (_, v) in &mut m {
    |                   ^^^^^^
help: use the corresponding method
    |
338 |     for v in m.values_mut() {
    |         ^    ^^^^^^^^^^^^^^

error: you seem to want to iterate on a map's values
   --> $DIR/for_loop.rs:343:19
    |
343 |     for (_, v) in &mut *m {
    |                   ^^^^^^^
help: use the corresponding method
    |
343 |     for v in (*m).values_mut() {
    |         ^    ^^^^^^^^^^^^^^^^^

error: you seem to want to iterate on a map's keys
   --> $DIR/for_loop.rs:349:24
    |
349 |     for (k, _value) in rm {
    |                        ^^
help: use the corresponding method
    |
349 |     for k in rm.keys() {
    |         ^    ^^^^^^^^^

error: it looks like you're manually copying between slices
   --> $DIR/for_loop.rs:402:14
    |
402 |     for i in 0..src.len() {
    |              ^^^^^^^^^^^^ help: try replacing the loop by: `dst[..src.len()].clone_from_slice(&src[..])`
    |
    = note: `-D clippy::manual-memcpy` implied by `-D warnings`

error: it looks like you're manually copying between slices
   --> $DIR/for_loop.rs:407:14
    |
407 |     for i in 0..src.len() {
    |              ^^^^^^^^^^^^ help: try replacing the loop by: `dst[10..(src.len() + 10)].clone_from_slice(&src[..])`

error: it looks like you're manually copying between slices
   --> $DIR/for_loop.rs:412:14
    |
412 |     for i in 0..src.len() {
    |              ^^^^^^^^^^^^ help: try replacing the loop by: `dst[..src.len()].clone_from_slice(&src[10..])`

error: it looks like you're manually copying between slices
   --> $DIR/for_loop.rs:417:14
    |
417 |     for i in 11..src.len() {
    |              ^^^^^^^^^^^^^ help: try replacing the loop by: `dst[11..src.len()].clone_from_slice(&src[(11 - 10)..(src.len() - 10)])`

error: it looks like you're manually copying between slices
   --> $DIR/for_loop.rs:422:14
    |
422 |     for i in 0..dst.len() {
    |              ^^^^^^^^^^^^ help: try replacing the loop by: `dst.clone_from_slice(&src[..dst.len()])`

error: it looks like you're manually copying between slices
   --> $DIR/for_loop.rs:435:14
    |
435 |     for i in 10..256 {
    |              ^^^^^^^
help: try replacing the loop by
    |
435 |     for i in dst[10..256].clone_from_slice(&src[(10 - 5)..(256 - 5)])
436 |     dst2[(10 + 500)..(256 + 500)].clone_from_slice(&src[10..256]) {
    |

error: it looks like you're manually copying between slices
   --> $DIR/for_loop.rs:447:14
    |
447 |     for i in 10..LOOP_OFFSET {
    |              ^^^^^^^^^^^^^^^ help: try replacing the loop by: `dst[(10 + LOOP_OFFSET)..(LOOP_OFFSET + LOOP_OFFSET)].clone_from_slice(&src[(10 - some_var)..(LOOP_OFFSET - some_var)])`

error: it looks like you're manually copying between slices
   --> $DIR/for_loop.rs:460:14
    |
460 |     for i in 0..src_vec.len() {
    |              ^^^^^^^^^^^^^^^^ help: try replacing the loop by: `dst_vec[..src_vec.len()].clone_from_slice(&src_vec[..])`

error: it looks like you're manually copying between slices
   --> $DIR/for_loop.rs:489:14
    |
489 |     for i in from..from + src.len() {
    |              ^^^^^^^^^^^^^^^^^^^^^^ help: try replacing the loop by: `dst[from..from + src.len()].clone_from_slice(&src[0..(from + src.len() - from)])`

error: it looks like you're manually copying between slices
   --> $DIR/for_loop.rs:493:14
    |
493 |     for i in from..from + 3 {
    |              ^^^^^^^^^^^^^^ help: try replacing the loop by: `dst[from..from + 3].clone_from_slice(&src[0..(from + 3 - from)])`

error: it looks like you're manually copying between slices
   --> $DIR/for_loop.rs:500:14
    |
500 |     for i in 0..src.len() {
    |              ^^^^^^^^^^^^ help: try replacing the loop by: `dst[..src.len()].clone_from_slice(&src[..])`

error: aborting due to 51 previous errors