error[E0277]: `&&std::slice::Iter<'_, {integer}>` is not an iterator --> $DIR/suggest-remove-refs-4.rs:4:15 | LL | for _i in &foo {} | ^^^^ `&&std::slice::Iter<'_, {integer}>` is not an iterator | = help: the trait `Iterator` is not implemented for `&&std::slice::Iter<'_, {integer}>` = note: required for `&&std::slice::Iter<'_, {integer}>` to implement `IntoIterator` help: consider removing 2 leading `&`-references | LL ~ let foo = [1,2,3].iter(); LL ~ for _i in foo {} | error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`.