error: expected `{`, found keyword `unsafe`
  --> $DIR/unsafe-foreign-mod-2.rs:1:12
   |
LL | extern "C" unsafe {
   |            ^^^^^^ expected `{`

error: extern block cannot be declared unsafe
  --> $DIR/unsafe-foreign-mod-2.rs:1:12
   |
LL | extern "C" unsafe {
   |            ^^^^^^
   |
   = note: see issue #123743 <https://github.com/rust-lang/rust/issues/123743> for more information
   = help: add `#![feature(unsafe_extern_blocks)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error: items in unadorned `extern` blocks cannot have safety qualifiers
  --> $DIR/unsafe-foreign-mod-2.rs:4:5
   |
LL |     unsafe fn foo();
   |     ^^^^^^^^^^^^^^^^

error: aborting due to 3 previous errors