error[E0277]: `&Enumerate<std::slice::Iter<'_, {integer}>>` is not an iterator
  --> $DIR/suggest-remove-refs-1.rs:6:19
   |
LL |     for (i, _) in &v.iter().enumerate() {
   |                   -^^^^^^^^^^^^^^^^^^^^
   |                   |
   |                   `&Enumerate<std::slice::Iter<'_, {integer}>>` is not an iterator
   |                   help: consider removing the leading `&`-reference
   |
   = help: the trait `Iterator` is not implemented for `&Enumerate<std::slice::Iter<'_, {integer}>>`
   = note: required because of the requirements on the impl of `IntoIterator` for `&Enumerate<std::slice::Iter<'_, {integer}>>`

error: aborting due to previous error

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