error[E0277]: `&Enumerate>` is not an iterator --> $DIR/suggest-remove-refs-1.rs:6:19 | LL | for (i, _) in &v.iter().enumerate() { | ^^^^^^^^^^^^^^^^^^^^^ `&Enumerate>` is not an iterator | = help: the trait `Iterator` is not implemented for `&Enumerate>` = note: required for `&Enumerate>` to implement `IntoIterator` help: consider removing the leading `&`-reference | LL - for (i, _) in &v.iter().enumerate() { LL + for (i, _) in v.iter().enumerate() { | error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.