error[E0365]: `foo` is only public within the crate, and cannot be re-exported outside
  --> $DIR/E0365.rs:5:9
   |
LL | pub use foo as foo2;
   |         ^^^^^^^^^^^ re-export of crate public `foo`
   |
   = note: consider declaring type or module `foo` with `pub`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0365`.