rust-clippy/tests/ui/for_loop.stderr

error: for loop over `option`, which is an `Option`. This is more readably written as an `if let` statement.
  --> $DIR/for_loop.rs:27:14
   |
27 |     for x in option {
   |              ^^^^^^
   |
   = note: `-D clippy::for-loop-over-option` implied by `-D warnings`
   = help: consider replacing `for x in option` with `if let Some(x) = option`

error: for loop over `result`, which is a `Result`. This is more readably written as an `if let` statement.
  --> $DIR/for_loop.rs:32:14
   |
32 |     for x in result {
   |              ^^^^^^
   |
   = note: `-D clippy::for-loop-over-result` implied by `-D warnings`
   = help: consider replacing `for x in result` with `if let Ok(x) = result`

error: for loop over `option.ok_or("x not found")`, which is a `Result`. This is more readably written as an `if let` statement.
  --> $DIR/for_loop.rs:36:14
   |
36 |     for x in option.ok_or("x not found") {
   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: consider replacing `for x in option.ok_or("x not found")` with `if let Ok(x) = option.ok_or("x not found")`

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:42:14
   |
42 |     for x in v.iter().next() {
   |              ^^^^^^^^^^^^^^^
   |
   = note: `-D clippy::iter-next-loop` implied by `-D warnings`

error: for loop over `v.iter().next().and(Some(0))`, which is an `Option`. This is more readably written as an `if let` statement.
  --> $DIR/for_loop.rs:47:14
   |
47 |     for x in v.iter().next().and(Some(0)) {
   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: consider replacing `for x in v.iter().next().and(Some(0))` with `if let Some(x) = v.iter().next().and(Some(0))`

error: for loop over `v.iter().next().ok_or("x not found")`, which is a `Result`. This is more readably written as an `if let` statement.
  --> $DIR/for_loop.rs:51:14
   |
51 |     for x in v.iter().next().ok_or("x not found") {
   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: consider replacing `for x in v.iter().next().ok_or("x not found")` with `if let Ok(x) = v.iter().next().ok_or("x not found")`

error: this loop never actually loops
  --> $DIR/for_loop.rs:63:5
   |
63 | /     while let Some(x) = option {
64 | |         println!("{}", x);
65 | |         break;
66 | |     }
   | |_____^
   |
   = note: `-D clippy::never-loop` implied by `-D warnings`

error: this loop never actually loops
  --> $DIR/for_loop.rs:69:5
   |
69 | /     while let Ok(x) = result {
70 | |         println!("{}", x);
71 | |         break;
72 | |     }
   | |_____^

error: the loop variable `i` is only used to index `vec`.
  --> $DIR/for_loop.rs:96:14
   |
96 |     for i in 0..vec.len() {
   |              ^^^^^^^^^^^^
   |
   = note: `-D clippy::needless-range-loop` implied by `-D warnings`
help: consider using an iterator
   |
96 |     for <item> in &vec {
   |         ^^^^^^    ^^^^

error: the loop variable `i` is only used to index `vec`.
   --> $DIR/for_loop.rs:105:14
    |
105 |     for i in 0..vec.len() {
    |              ^^^^^^^^^^^^
help: consider using an iterator
    |
105 |     for <item> in &vec {
    |         ^^^^^^    ^^^^

error: the loop variable `j` is only used to index `STATIC`.
   --> $DIR/for_loop.rs:110:14
    |
110 |     for j in 0..4 {
    |              ^^^^
help: consider using an iterator
    |
110 |     for <item> in &STATIC {
    |         ^^^^^^    ^^^^^^^

error: the loop variable `j` is only used to index `CONST`.
   --> $DIR/for_loop.rs:114:14
    |
114 |     for j in 0..4 {
    |              ^^^^
help: consider using an iterator
    |
114 |     for <item> in &CONST {
    |         ^^^^^^    ^^^^^^

error: the loop variable `i` is used to index `vec`
   --> $DIR/for_loop.rs:118:14
    |
118 |     for i in 0..vec.len() {
    |              ^^^^^^^^^^^^
help: consider using an iterator
    |
118 |     for (i, <item>) in vec.iter().enumerate() {
    |         ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is only used to index `vec2`.
   --> $DIR/for_loop.rs:126:14
    |
126 |     for i in 0..vec.len() {
    |              ^^^^^^^^^^^^
help: consider using an iterator
    |
126 |     for <item> in vec2.iter().take(vec.len()) {
    |         ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is only used to index `vec`.
   --> $DIR/for_loop.rs:130:14
    |
130 |     for i in 5..vec.len() {
    |              ^^^^^^^^^^^^
help: consider using an iterator
    |
130 |     for <item> in vec.iter().skip(5) {
    |         ^^^^^^    ^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is only used to index `vec`.
   --> $DIR/for_loop.rs:134:14
    |
134 |     for i in 0..MAX_LEN {
    |              ^^^^^^^^^^
help: consider using an iterator
    |
134 |     for <item> in vec.iter().take(MAX_LEN) {
    |         ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is only used to index `vec`.
   --> $DIR/for_loop.rs:138:14
    |
138 |     for i in 0..=MAX_LEN {
    |              ^^^^^^^^^^^
help: consider using an iterator
    |
138 |     for <item> in vec.iter().take(MAX_LEN + 1) {
    |         ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is only used to index `vec`.
   --> $DIR/for_loop.rs:142:14
    |
142 |     for i in 5..10 {
    |              ^^^^^
help: consider using an iterator
    |
142 |     for <item> in vec.iter().take(10).skip(5) {
    |         ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is only used to index `vec`.
   --> $DIR/for_loop.rs:146:14
    |
146 |     for i in 5..=10 {
    |              ^^^^^^
help: consider using an iterator
    |
146 |     for <item> in vec.iter().take(10 + 1).skip(5) {
    |         ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is used to index `vec`
   --> $DIR/for_loop.rs:150:14
    |
150 |     for i in 5..vec.len() {
    |              ^^^^^^^^^^^^
help: consider using an iterator
    |
150 |     for (i, <item>) in vec.iter().enumerate().skip(5) {
    |         ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the loop variable `i` is used to index `vec`
   --> $DIR/for_loop.rs:154:14
    |
154 |     for i in 5..10 {
    |              ^^^^^
help: consider using an iterator
    |
154 |     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:158:14
    |
158 |     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
    |
158 |     for i in (0..10).rev() {
    |              ^^^^^^^^^^^^^

error: this range is empty so this for loop will never run
   --> $DIR/for_loop.rs:162:14
    |
162 |     for i in 10..=0 {
    |              ^^^^^^
help: consider using the following if you are attempting to iterate over this range in reverse
    |
162 |     for i in (0...10).rev() {
    |              ^^^^^^^^^^^^^^

error: this range is empty so this for loop will never run
   --> $DIR/for_loop.rs:166:14
    |
166 |     for i in MAX_LEN..0 {
    |              ^^^^^^^^^^
help: consider using the following if you are attempting to iterate over this range in reverse
    |
166 |     for i in (0..MAX_LEN).rev() {
    |              ^^^^^^^^^^^^^^^^^^

error: this range is empty so this for loop will never run
   --> $DIR/for_loop.rs:170:14
    |
170 |     for i in 5..5 {
    |              ^^^^

error: this range is empty so this for loop will never run
   --> $DIR/for_loop.rs:195:14
    |
195 |     for i in 10..5 + 4 {
    |              ^^^^^^^^^
help: consider using the following if you are attempting to iterate over this range in reverse
    |
195 |     for i in (5 + 4..10).rev() {
    |              ^^^^^^^^^^^^^^^^^

error: this range is empty so this for loop will never run
   --> $DIR/for_loop.rs:199:14
    |
199 |     for i in (5 + 2)..(3 - 1) {
    |              ^^^^^^^^^^^^^^^^
help: consider using the following if you are attempting to iterate over this range in reverse
    |
199 |     for i in ((3 - 1)..(5 + 2)).rev() {
    |              ^^^^^^^^^^^^^^^^^^^^^^^^

error: this range is empty so this for loop will never run
   --> $DIR/for_loop.rs:203:14
    |
203 |     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:225:15
    |
225 |     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:227:15
    |
227 |     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:230:15
    |
230 |     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:233:15
    |
233 |     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:238:15
    |
238 |     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:242:15
    |
242 |     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:247:15
    |
247 |     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:250:15
    |
250 |     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:253:15
    |
253 |     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:256:15
    |
256 |     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:259:15
    |
259 |     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:262:15
    |
262 |     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:265:15
    |
265 |     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:267:15
    |
267 |     for _v in vec.iter().next() {}
    |               ^^^^^^^^^^^^^^^^^

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:274:5
    |
274 |     vec.iter().cloned().map(|x| out.push(x)).collect::<Vec<_>>();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D clippy::unused-collect` implied by `-D warnings`

error: the variable `_index` is used as a loop counter. Consider using `for (_index, item) in &vec.enumerate()` or similar iterators
   --> $DIR/for_loop.rs:279:15
    |
279 |     for _v in &vec {
    |               ^^^^
    |
    = note: `-D clippy::explicit-counter-loop` implied by `-D warnings`

error: the variable `_index` is used as a loop counter. Consider using `for (_index, item) in &vec.enumerate()` or similar iterators
   --> $DIR/for_loop.rs:285:15
    |
285 |     for _v in &vec {
    |               ^^^^

error: you seem to want to iterate on a map's values
   --> $DIR/for_loop.rs:395:19
    |
395 |     for (_, v) in &m {
    |                   ^^
    |
    = note: `-D clippy::for-kv-map` implied by `-D warnings`
help: use the corresponding method
    |
395 |     for v in m.values() {
    |         ^    ^^^^^^^^^^

error: you seem to want to iterate on a map's values
   --> $DIR/for_loop.rs:400:19
    |
400 |     for (_, v) in &*m {
    |                   ^^^
help: use the corresponding method
    |
400 |     for v in (*m).values() {
    |         ^    ^^^^^^^^^^^^^

error: you seem to want to iterate on a map's values
   --> $DIR/for_loop.rs:408:19
    |
408 |     for (_, v) in &mut m {
    |                   ^^^^^^
help: use the corresponding method
    |
408 |     for v in m.values_mut() {
    |         ^    ^^^^^^^^^^^^^^

error: you seem to want to iterate on a map's values
   --> $DIR/for_loop.rs:413:19
    |
413 |     for (_, v) in &mut *m {
    |                   ^^^^^^^
help: use the corresponding method
    |
413 |     for v in (*m).values_mut() {
    |         ^    ^^^^^^^^^^^^^^^^^

error: you seem to want to iterate on a map's keys
   --> $DIR/for_loop.rs:419:24
    |
419 |     for (k, _value) in rm {
    |                        ^^
help: use the corresponding method
    |
419 |     for k in rm.keys() {
    |         ^    ^^^^^^^^^

error: it looks like you're manually copying between slices
   --> $DIR/for_loop.rs:472:14
    |
472 |     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:477:14
    |
477 |     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:482:14
    |
482 |     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:487:14
    |
487 |     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:492:14
    |
492 |     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:505:14
    |
505 |     for i in 10..256 {
    |              ^^^^^^^
help: try replacing the loop by
    |
505 |     for i in dst[10..256].clone_from_slice(&src[(10 - 5)..(256 - 5)])
506 |     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:517:14
    |
517 |     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:530:14
    |
530 |     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:559:14
    |
559 |     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:563:14
    |
563 |     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:570:14
    |
570 |     for i in 0..src.len() {
    |              ^^^^^^^^^^^^ help: try replacing the loop by: `dst[..src.len()].clone_from_slice(&src[..])`

error: the variable `count` is used as a loop counter. Consider using `for (count, item) in text.chars().enumerate()` or similar iterators
   --> $DIR/for_loop.rs:631:19
    |
631 |         for ch in text.chars() {
    |                   ^^^^^^^^^^^^

error: the variable `count` is used as a loop counter. Consider using `for (count, item) in text.chars().enumerate()` or similar iterators
   --> $DIR/for_loop.rs:642:19
    |
642 |         for ch in text.chars() {
    |                   ^^^^^^^^^^^^

error: aborting due to 63 previous errors