error: malformed `instruction_set` attribute input
  --> $DIR/feature-gate-isa_attribute.rs:1:1
   |
LL | #[instruction_set]
   | ^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[instruction_set(set)]`

error[E0658]: the `#[instruction_set]` attribute is an experimental feature
  --> $DIR/feature-gate-isa_attribute.rs:1:1
   |
LL | #[instruction_set]
   | ^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #74727 <https://github.com/rust-lang/rust/issues/74727> for more information
   = help: add `#![feature(isa_attribute)]` to the crate attributes to enable

error[E0778]: must specify an instruction set
  --> $DIR/feature-gate-isa_attribute.rs:1:1
   |
LL | #[instruction_set]
   | ^^^^^^^^^^^^^^^^^^

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0658, E0778.
For more information about an error, try `rustc --explain E0658`.