error[E0658]: the `#[must_not_suspend]` attribute is an experimental feature
  --> $DIR/feature-gate-must_not_suspend.rs:3:1
   |
LL | #[must_not_suspend = "You gotta use Umm's, ya know?"]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #83310 <https://github.com/rust-lang/rust/issues/83310> for more information
   = help: add `#![feature(must_not_suspend)]` to the crate attributes to enable

error: aborting due to previous error

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