error[E0446]: private type `Bar` in public interface
 --> tests/fail/private_in_pub_trait.rs:8:1
  |
4 | pub(crate) struct Bar;
  | --------------------- `Bar` declared as private
...
8 | #[implicit_trait(pub)]
  | ^^^^^^^^^^^^^^^^^^^^^^ can't leak private type
  |
  = note: this error originates in the attribute macro `implicit_trait` (in Nightly builds, run with -Z macro-backtrace for more info)