error[E0277]: `&&&&&Enumerate<std::slice::Iter<'_, {integer}>>` is not an iterator
  --> $DIR/suggest-remove-refs-3.rs:6:19
   |
LL |       for (i, _) in & & &
   |  ___________________^
LL | |         & &v
LL | |         .iter()
LL | |         .enumerate() {
   | |____________________^ `&&&&&Enumerate<std::slice::Iter<'_, {integer}>>` is not an iterator
   |
   = help: the trait `Iterator` is not implemented for `&&&&&Enumerate<std::slice::Iter<'_, {integer}>>`
   = note: required for `&&&&&Enumerate<std::slice::Iter<'_, {integer}>>` to implement `IntoIterator`
help: consider removing 5 leading `&`-references
   |
LL -     for (i, _) in & & &
LL +     for (i, _) in v
   |

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.