tests/ui/nll/polonius/nll-problem-case-3-issue-124254.nll.stderr

error[E0499]: cannot borrow `list[_]` as mutable more than once at a time
  --> $DIR/nll-problem-case-3-issue-124254.rs:30:5
   |
LL | fn find_lowest_or_first_empty_pos(list: &mut [Option<u8>]) -> &mut Option<u8> {
   |                                         - let's call the lifetime of this reference `'1`
LL |     let mut low_pos_val: Option<(usize, u8)> = None;
LL |     for (idx, i) in list.iter_mut().enumerate() {
   |                     ---- first mutable borrow occurs here
LL |         let Some(s) = i else {
LL |             return i;
   |                    - returning this value requires that `*list` is borrowed for `'1`
...
LL |     &mut list[lowest_idx]
   |     ^^^^^^^^^^^^^^^^^^^^^ second mutable borrow occurs here

error[E0503]: cannot use `*list` because it was mutably borrowed
  --> $DIR/nll-problem-case-3-issue-124254.rs:30:10
   |
LL | fn find_lowest_or_first_empty_pos(list: &mut [Option<u8>]) -> &mut Option<u8> {
   |                                         - let's call the lifetime of this reference `'1`
LL |     let mut low_pos_val: Option<(usize, u8)> = None;
LL |     for (idx, i) in list.iter_mut().enumerate() {
   |                     ---- `*list` is borrowed here
LL |         let Some(s) = i else {
LL |             return i;
   |                    - returning this value requires that `*list` is borrowed for `'1`
...
LL |     &mut list[lowest_idx]
   |          ^^^^^^^^^^^^^^^^ use of borrowed `*list`

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0499, E0503.
For more information about an error, try `rustc --explain E0499`.