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error[E0107]: missing generics for struct `Vec`
  --> $DIR/issue-92305.rs:5:45
   |
LL | fn f<T>(data: &[T]) -> impl Iterator<Item = Vec> {
   |                                             ^^^ expected at least 1 generic argument
   |
help: add missing generic argument
   |
LL | fn f<T>(data: &[T]) -> impl Iterator<Item = Vec<T>> {
   |                                                +++

error[E0107]: missing generics for struct `Vec`
  --> $DIR/issue-92305.rs:5:45
   |
LL | fn f<T>(data: &[T]) -> impl Iterator<Item = Vec> {
   |                                             ^^^ expected at least 1 generic argument
   |
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
help: add missing generic argument
   |
LL | fn f<T>(data: &[T]) -> impl Iterator<Item = Vec<T>> {
   |                                                +++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0107`.