error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:15:5
   |
LL |     while let Option::Some(x) = iter.next() {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x in iter`
   |
   = note: `-D clippy::while-let-on-iterator` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::while_let_on_iterator)]`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:20:5
   |
LL |     while let Some(x) = iter.next() {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x in iter`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:25:5
   |
LL |     while let Some(_) = iter.next() {}
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for _ in iter`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:101:9
   |
LL |         while let Some([..]) = it.next() {}
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for [..] in it`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:108:9
   |
LL |         while let Some([_x]) = it.next() {}
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for [_x] in it`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:121:9
   |
LL |         while let Some(x @ [_]) = it.next() {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x @ [_] in it`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:141:9
   |
LL |         while let Some(_) = y.next() {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for _ in y`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:198:9
   |
LL |         while let Some(m) = it.next() {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for m in it.by_ref()`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:209:5
   |
LL |     while let Some(n) = it.next() {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for n in it`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:211:9
   |
LL |         while let Some(m) = it.next() {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for m in it`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:220:9
   |
LL |         while let Some(m) = it.next() {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for m in it`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:229:9
   |
LL |         while let Some(m) = it.next() {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for m in it.by_ref()`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:246:9
   |
LL |         while let Some(m) = it.next() {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for m in it.by_ref()`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:261:13
   |
LL |             while let Some(i) = self.0.next() {
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for i in self.0.by_ref()`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:293:13
   |
LL |             while let Some(i) = self.0.0.0.next() {
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for i in self.0.0.0.by_ref()`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:322:5
   |
LL |     while let Some(n) = it.next() {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for n in it.by_ref()`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:334:9
   |
LL |         while let Some(x) = it.next() {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x in it.by_ref()`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:348:5
   |
LL |     while let Some(x) = it.next() {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x in it.by_ref()`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:359:5
   |
LL |     while let Some(x) = it.0.next() {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x in it.0.by_ref()`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:394:5
   |
LL |     while let Some(x) = s.x.next() {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x in s.x.by_ref()`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:401:5
   |
LL |     while let Some(x) = x[0].next() {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x in x[0].by_ref()`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:409:9
   |
LL |         while let Some(x) = it.next() {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x in it.by_ref()`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:419:9
   |
LL |         while let Some(x) = it.next() {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x in it`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:429:9
   |
LL |         while let Some(x) = it.next() {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x in it.by_ref()`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:439:9
   |
LL |         while let Some(x) = it.next() {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x in it`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:451:9
   |
LL |         while let Some(x) = it.next() {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x in it`

error: this loop could be written as a `for` loop
  --> $DIR/while_let_on_iterator.rs:461:5
   |
LL |     while let Some(..) = it.next() {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for _ in it`

error: aborting due to 27 previous errors