error[E0433]: failed to resolve: `Self` is only available in impls, traits, and type definitions
  --> $DIR/ice-array-into-iter-lint-issue-121532.rs:7:12
   |
LL | fn func(a: Self::ItemsIterator) {
   |            ^^^^ `Self` is only available in impls, traits, and type definitions

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0433`.