error: for loop over `option`, which is an `Option`. This is more readably written as an `if let` statement. --> $DIR/for_loop.rs:17:14 | 17 | for x in option { | ^^^^^^ | = note: `-D 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:22:14 | 22 | for x in result { | ^^^^^^ | = note: `-D 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:26:14 | 26 | 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:32:5 | 32 | / for x in v.iter().next() { 33 | | println!("{}", x); 34 | | } | |_____^ | = note: `-D 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:37:14 | 37 | 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:41:14 | 41 | 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:53:5 | 53 | / while let Some(x) = option { 54 | | println!("{}", x); 55 | | break; 56 | | } | |_____^ | = note: `-D never-loop` implied by `-D warnings` error: this loop never actually loops --> $DIR/for_loop.rs:59:5 | 59 | / while let Ok(x) = result { 60 | | println!("{}", x); 61 | | break; 62 | | } | |_____^ error: the loop variable `i` is only used to index `vec`. --> $DIR/for_loop.rs:86:5 | 86 | / for i in 0..vec.len() { 87 | | println!("{}", vec[i]); 88 | | } | |_____^ | = note: `-D needless-range-loop` implied by `-D warnings` help: consider using an iterator | 86 | for in &vec { | ^^^^^^ error: the loop variable `i` is only used to index `vec`. --> $DIR/for_loop.rs:95:5 | 95 | / for i in 0..vec.len() { 96 | | let _ = vec[i]; 97 | | } | |_____^ | help: consider using an iterator | 95 | for in &vec { | ^^^^^^ error: the loop variable `j` is only used to index `STATIC`. --> $DIR/for_loop.rs:100:5 | 100 | / for j in 0..4 { 101 | | println!("{:?}", STATIC[j]); 102 | | } | |_____^ | help: consider using an iterator | 100 | for in STATIC.iter().take(4) { | ^^^^^^ error: the loop variable `j` is only used to index `CONST`. --> $DIR/for_loop.rs:104:5 | 104 | / for j in 0..4 { 105 | | println!("{:?}", CONST[j]); 106 | | } | |_____^ | help: consider using an iterator | 104 | for in CONST.iter().take(4) { | ^^^^^^ error: the loop variable `i` is used to index `vec` --> $DIR/for_loop.rs:108:5 | 108 | / for i in 0..vec.len() { 109 | | println!("{} {}", vec[i], i); 110 | | } | |_____^ | help: consider using an iterator | 108 | for (i, ) in vec.iter().enumerate() { | ^^^^^^^^^^^ error: the loop variable `i` is only used to index `vec2`. --> $DIR/for_loop.rs:116:5 | 116 | / for i in 0..vec.len() { 117 | | println!("{}", vec2[i]); 118 | | } | |_____^ | help: consider using an iterator | 116 | for in vec2.iter().take(vec.len()) { | ^^^^^^ error: the loop variable `i` is only used to index `vec`. --> $DIR/for_loop.rs:120:5 | 120 | / for i in 5..vec.len() { 121 | | println!("{}", vec[i]); 122 | | } | |_____^ | help: consider using an iterator | 120 | for in vec.iter().skip(5) { | ^^^^^^ error: the loop variable `i` is only used to index `vec`. --> $DIR/for_loop.rs:124:5 | 124 | / for i in 0..MAX_LEN { 125 | | println!("{}", vec[i]); 126 | | } | |_____^ | help: consider using an iterator | 124 | for in vec.iter().take(MAX_LEN) { | ^^^^^^ error: the loop variable `i` is only used to index `vec`. --> $DIR/for_loop.rs:128:5 | 128 | / for i in 0..=MAX_LEN { 129 | | println!("{}", vec[i]); 130 | | } | |_____^ | help: consider using an iterator | 128 | for in vec.iter().take(MAX_LEN + 1) { | ^^^^^^ error: the loop variable `i` is only used to index `vec`. --> $DIR/for_loop.rs:132:5 | 132 | / for i in 5..10 { 133 | | println!("{}", vec[i]); 134 | | } | |_____^ | help: consider using an iterator | 132 | for in vec.iter().take(10).skip(5) { | ^^^^^^ error: the loop variable `i` is only used to index `vec`. --> $DIR/for_loop.rs:136:5 | 136 | / for i in 5..=10 { 137 | | println!("{}", vec[i]); 138 | | } | |_____^ | help: consider using an iterator | 136 | for in vec.iter().take(10 + 1).skip(5) { | ^^^^^^ error: the loop variable `i` is used to index `vec` --> $DIR/for_loop.rs:140:5 | 140 | / for i in 5..vec.len() { 141 | | println!("{} {}", vec[i], i); 142 | | } | |_____^ | help: consider using an iterator | 140 | for (i, ) in vec.iter().enumerate().skip(5) { | ^^^^^^^^^^^ error: the loop variable `i` is used to index `vec` --> $DIR/for_loop.rs:144:5 | 144 | / for i in 5..10 { 145 | | println!("{} {}", vec[i], i); 146 | | } | |_____^ | help: consider using an iterator | 144 | for (i, ) in vec.iter().enumerate().take(10).skip(5) { | ^^^^^^^^^^^ error: this range is empty so this for loop will never run --> $DIR/for_loop.rs:148:5 | 148 | / for i in 10..0 { 149 | | println!("{}", i); 150 | | } | |_____^ | = note: `-D reverse-range-loop` implied by `-D warnings` help: consider using the following if you are attempting to iterate over this range in reverse | 148 | for i in (0..10).rev() { | ^^^^^^^^^^^^^ error: this range is empty so this for loop will never run --> $DIR/for_loop.rs:152:5 | 152 | / for i in 10..=0 { 153 | | println!("{}", i); 154 | | } | |_____^ | help: consider using the following if you are attempting to iterate over this range in reverse | 152 | for i in (0...10).rev() { | ^^^^^^^^^^^^^^ error: this range is empty so this for loop will never run --> $DIR/for_loop.rs:156:5 | 156 | / for i in MAX_LEN..0 { 157 | | println!("{}", i); 158 | | } | |_____^ | help: consider using the following if you are attempting to iterate over this range in reverse | 156 | for i in (0..MAX_LEN).rev() { | ^^^^^^^^^^^^^^^^^^ error: this range is empty so this for loop will never run --> $DIR/for_loop.rs:160:5 | 160 | / for i in 5..5 { 161 | | println!("{}", i); 162 | | } | |_____^ error: this range is empty so this for loop will never run --> $DIR/for_loop.rs:185:5 | 185 | / for i in 10..5 + 4 { 186 | | println!("{}", i); 187 | | } | |_____^ | help: consider using the following if you are attempting to iterate over this range in reverse | 185 | for i in (5 + 4..10).rev() { | ^^^^^^^^^^^^^^^^^ error: this range is empty so this for loop will never run --> $DIR/for_loop.rs:189:5 | 189 | / for i in (5 + 2)..(3 - 1) { 190 | | println!("{}", i); 191 | | } | |_____^ | help: consider using the following if you are attempting to iterate over this range in reverse | 189 | for i in ((3 - 1)..(5 + 2)).rev() { | ^^^^^^^^^^^^^^^^^^^^^^^^ error: this range is empty so this for loop will never run --> $DIR/for_loop.rs:193:5 | 193 | / for i in (5 + 2)..(8 - 1) { 194 | | println!("{}", i); 195 | | } | |_____^ error: it is more idiomatic to loop over references to containers instead of using explicit iteration methods --> $DIR/for_loop.rs:215:15 | 215 | for _v in vec.iter() {} | ^^^^^^^^^^ help: to write this more concisely, try: `&vec` | = note: `-D explicit-iter-loop` implied by `-D warnings` error: it is more idiomatic to loop over references to containers instead of using explicit iteration methods --> $DIR/for_loop.rs:217:15 | 217 | for _v in vec.iter_mut() {} | ^^^^^^^^^^^^^^ help: to write this more concisely, try: `&mut vec` error: it is more idiomatic to loop over containers instead of using explicit iteration methods` --> $DIR/for_loop.rs:220:15 | 220 | for _v in out_vec.into_iter() {} | ^^^^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `out_vec` | = note: `-D explicit-into-iter-loop` implied by `-D warnings` error: it is more idiomatic to loop over references to containers instead of using explicit iteration methods --> $DIR/for_loop.rs:223:15 | 223 | for _v in array.into_iter() {} | ^^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `&array` error: it is more idiomatic to loop over references to containers instead of using explicit iteration methods --> $DIR/for_loop.rs:228:15 | 228 | for _v in [1, 2, 3].iter() {} | ^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `&[1, 2, 3]` error: it is more idiomatic to loop over references to containers instead of using explicit iteration methods --> $DIR/for_loop.rs:232:15 | 232 | for _v in [0; 32].iter() {} | ^^^^^^^^^^^^^^ help: to write this more concisely, try: `&[0; 32]` error: it is more idiomatic to loop over references to containers instead of using explicit iteration methods --> $DIR/for_loop.rs:237:15 | 237 | for _v in ll.iter() {} | ^^^^^^^^^ help: to write this more concisely, try: `&ll` error: it is more idiomatic to loop over references to containers instead of using explicit iteration methods --> $DIR/for_loop.rs:240:15 | 240 | for _v in vd.iter() {} | ^^^^^^^^^ help: to write this more concisely, try: `&vd` error: it is more idiomatic to loop over references to containers instead of using explicit iteration methods --> $DIR/for_loop.rs:243:15 | 243 | for _v in bh.iter() {} | ^^^^^^^^^ help: to write this more concisely, try: `&bh` error: it is more idiomatic to loop over references to containers instead of using explicit iteration methods --> $DIR/for_loop.rs:246:15 | 246 | for _v in hm.iter() {} | ^^^^^^^^^ help: to write this more concisely, try: `&hm` error: it is more idiomatic to loop over references to containers instead of using explicit iteration methods --> $DIR/for_loop.rs:249:15 | 249 | for _v in bt.iter() {} | ^^^^^^^^^ help: to write this more concisely, try: `&bt` error: it is more idiomatic to loop over references to containers instead of using explicit iteration methods --> $DIR/for_loop.rs:252:15 | 252 | for _v in hs.iter() {} | ^^^^^^^^^ help: to write this more concisely, try: `&hs` error: it is more idiomatic to loop over references to containers instead of using explicit iteration methods --> $DIR/for_loop.rs:255:15 | 255 | 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:257:5 | 257 | 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:264:5 | 264 | vec.iter().cloned().map(|x| out.push(x)).collect::>(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `-D 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:269:5 | 269 | / for _v in &vec { 270 | | _index += 1 271 | | } | |_____^ | = note: `-D 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:275:5 | 275 | / for _v in &vec { 276 | | _index += 1 277 | | } | |_____^ error: you seem to want to iterate on a map's values --> $DIR/for_loop.rs:385:5 | 385 | / for (_, v) in &m { 386 | | let _v = v; 387 | | } | |_____^ | = note: `-D for-kv-map` implied by `-D warnings` help: use the corresponding method | 385 | for v in m.values() { | ^ error: you seem to want to iterate on a map's values --> $DIR/for_loop.rs:390:5 | 390 | / for (_, v) in &*m { 391 | | let _v = v; 392 | | // Here the `*` is not actually necesarry, but the test tests that we don't 393 | | // suggest 394 | | // `in *m.values()` as we used to 395 | | } | |_____^ | help: use the corresponding method | 390 | for v in (*m).values() { | ^ error: you seem to want to iterate on a map's values --> $DIR/for_loop.rs:398:5 | 398 | / for (_, v) in &mut m { 399 | | let _v = v; 400 | | } | |_____^ | help: use the corresponding method | 398 | for v in m.values_mut() { | ^ error: you seem to want to iterate on a map's values --> $DIR/for_loop.rs:403:5 | 403 | / for (_, v) in &mut *m { 404 | | let _v = v; 405 | | } | |_____^ | help: use the corresponding method | 403 | for v in (*m).values_mut() { | ^ error: you seem to want to iterate on a map's keys --> $DIR/for_loop.rs:409:5 | 409 | / for (k, _value) in rm { 410 | | let _k = k; 411 | | } | |_____^ | help: use the corresponding method | 409 | for k in rm.keys() { | ^ error: it looks like you're manually copying between slices --> $DIR/for_loop.rs:462:5 | 462 | / for i in 0..src.len() { 463 | | dst[i] = src[i]; 464 | | } | |_____^ help: try replacing the loop by: `dst[..src.len()].clone_from_slice(&src[..])` | = note: `-D manual-memcpy` implied by `-D warnings` error: it looks like you're manually copying between slices --> $DIR/for_loop.rs:467:5 | 467 | / for i in 0..src.len() { 468 | | dst[i + 10] = src[i]; 469 | | } | |_____^ 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:472:5 | 472 | / for i in 0..src.len() { 473 | | dst[i] = src[i + 10]; 474 | | } | |_____^ 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:477:5 | 477 | / for i in 11..src.len() { 478 | | dst[i] = src[i - 10]; 479 | | } | |_____^ 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:482:5 | 482 | / for i in 0..dst.len() { 483 | | dst[i] = src[i]; 484 | | } | |_____^ 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:495:5 | 495 | / for i in 10..256 { 496 | | dst[i] = src[i - 5]; 497 | | dst2[i + 500] = src[i] 498 | | } | |_____^ | help: try replacing the loop by | 495 | dst[10..256].clone_from_slice(&src[(10 - 5)..(256 - 5)]) 496 | 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:507:5 | 507 | / for i in 10..LOOP_OFFSET { 508 | | dst[i + LOOP_OFFSET] = src[i - some_var]; 509 | | } | |_____^ 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:520:5 | 520 | / for i in 0..src_vec.len() { 521 | | dst_vec[i] = src_vec[i]; 522 | | } | |_____^ 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:547:5 | 547 | / for i in 0..src.len() { 548 | | dst[i] = src[i].clone(); 549 | | } | |_____^ help: try replacing the loop by: `dst[..src.len()].clone_from_slice(&src[..])`