error[E0658]: the `#[rustc_align]` attribute is an experimental feature
  --> $DIR/feature-gate-fn_align.rs:7:1
   |
LL | #[rustc_align(16)]
   | ^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #82232 <https://github.com/rust-lang/rust/issues/82232> for more information
   = help: add `#![feature(fn_align)]` 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   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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[E0658]: the `#[rustc_align]` attribute is an experimental feature
  --> $DIR/feature-gate-fn_align.rs:12:5
   |
LL |     #[rustc_align]
   |     ^^^^^^^^^^^^^^
   |
   = note: see issue #82232 <https://github.com/rust-lang/rust/issues/82232> for more information
   = help: add `#![feature(fn_align)]` 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   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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[E0539]: malformed `rustc_align` attribute input
  --> $DIR/feature-gate-fn_align.rs:12:5
   |
LL |     #[rustc_align]
   |     ^^^^^^^^^^^^^^
   |     |
   |     expected this to be a list
   |     help: must be of the form: `#[rustc_align(<alignment in bytes>)]`

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0539, E0658.
For more information about an error, try `rustc --explain E0539`.