error: extern crate `core` is private, and cannot be re-exported (error E0365), consider declaring with `pub`
  --> $DIR/pub-reexport-priv-extern-crate.rs:4:9
   |
LL | pub use core as reexported_core;
   |         ^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[deny(pub_use_of_private_extern_crate)]` on by default
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>

error: extern crate `core` is private, and cannot be re-exported (error E0365), consider declaring with `pub`
  --> $DIR/pub-reexport-priv-extern-crate.rs:12:9
   |
LL |     use foo1::core;
   |         ^^^^^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>

error: extern crate `core` is private, and cannot be re-exported (error E0365), consider declaring with `pub`
  --> $DIR/pub-reexport-priv-extern-crate.rs:20:13
   |
LL |     pub use foo2::bar::core;
   |             ^^^^^^^^^^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>

error: aborting due to 3 previous errors