error[E0658]: the `#[expect]` attribute is an experimental feature
  --> $DIR/expect_missing_feature_gate.rs:5:1
   |
LL | #[expect(unused)]
   | ^^^^^^^^^^^^^^^^^
   |
   = note: see issue #54503 <https://github.com/rust-lang/rust/issues/54503> for more information
   = help: add `#![feature(lint_reasons)]` to the crate attributes to enable

error: aborting due to previous error

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