error[E0658]: the `#[deprecated_safe]` attribute is an experimental feature
  --> $DIR/feature-gate-deprecated_safe.rs:1:1
   |
LL | #[deprecated_safe(since = "TBD", note = "...")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #94978 <https://github.com/rust-lang/rust/issues/94978> for more information
   = help: add `#![feature(deprecated_safe)]` to the crate attributes to enable

error[E0658]: the `#[deprecated_safe]` attribute is an experimental feature
  --> $DIR/feature-gate-deprecated_safe.rs:4:1
   |
LL | #[deprecated_safe(since = "TBD", note = "...")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #94978 <https://github.com/rust-lang/rust/issues/94978> for more information
   = help: add `#![feature(deprecated_safe)]` to the crate attributes to enable

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0658`.