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}>`, which is required by `&&std::slice::Iter<'_, {integer}>: IntoIterator`
   = 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`.