1error[E0277]: `()` is not an iterator 2 --> $DIR/conservative_impl_trait.rs:3:33 3 | 4LL | fn will_ice(something: &u32) -> impl Iterator<Item = &u32> { 5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^ `()` is not an iterator 6 | 7 = help: the trait `Iterator` is not implemented for `()` 8 9error: aborting due to previous error 10 11For more information about this error, try `rustc --explain E0277`. 12