error[E0603]: crate import `core` is private
  --> $DIR/pub-reexport-priv-extern-crate.rs:10:15
   |
LL |     use foo1::core;
   |               ^^^^ private crate import
   |
note: the crate import `core` is defined here
  --> $DIR/pub-reexport-priv-extern-crate.rs:6:5
   |
LL |     extern crate core;
   |     ^^^^^^^^^^^^^^^^^^

error[E0603]: crate import `core` is private
  --> $DIR/pub-reexport-priv-extern-crate.rs:17:24
   |
LL |     pub use foo2::bar::core;
   |                        ^^^^ private crate import
   |
note: the crate import `core` is defined here
  --> $DIR/pub-reexport-priv-extern-crate.rs:12:9
   |
LL |         extern crate core;
   |         ^^^^^^^^^^^^^^^^^^

error[E0365]: extern crate `core` is private and cannot be re-exported
  --> $DIR/pub-reexport-priv-extern-crate.rs:2:9
   |
LL | pub use core as reexported_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 #127909 <https://github.com/rust-lang/rust/issues/127909>
   = note: `#[deny(pub_use_of_private_extern_crate)]` on by default
help: consider making the `extern crate` item publicly accessible
   |
LL | pub extern crate core;
   | +++

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0365, E0603.
For more information about an error, try `rustc --explain E0365`.
Future incompatibility report: Future breakage diagnostic:
error[E0365]: extern crate `core` is private and cannot be re-exported
  --> $DIR/pub-reexport-priv-extern-crate.rs:2:9
   |
LL | pub use core as reexported_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 #127909 <https://github.com/rust-lang/rust/issues/127909>
   = note: `#[deny(pub_use_of_private_extern_crate)]` on by default
help: consider making the `extern crate` item publicly accessible
   |
LL | pub extern crate core;
   | +++