error[E0499]: cannot borrow `*elements` as mutable more than once at a time
  --> $DIR/iterating-updating-cursor-issue-108704.rs:41:26
   |
LL |         for (idx, el) in elements.iter_mut().enumerate() {
   |                          ^^^^^^^^
   |                          |
   |                          `*elements` was mutably borrowed here in the previous iteration of the loop
   |                          first borrow used here, in later iteration of loop

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0499`.