error: functions tagged with `#[proc_macro]` must be `pub`
  --> $DIR/visibility-path.rs:12:1
   |
LL | pub(self) fn outer(input: TokenStream) -> TokenStream {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: functions tagged with `#[proc_macro]` must currently reside in the root of the crate
  --> $DIR/visibility-path.rs:21:5
   |
LL |     pub(super) fn inner(input: TokenStream) -> TokenStream {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors