error[E0277]: `&&&&&Enumerate>` is not an iterator --> $DIR/suggest-remove-refs-2.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 5 leading `&`-references | LL - for (i, _) in & & & & &v.iter().enumerate() { LL + for (i, _) in v.iter().enumerate() { | error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`.