error[E0658]: the `#[cfi_encoding]` attribute is an experimental feature --> $DIR/feature-gate-cfi_encoding.rs:3:1 | LL | #[cfi_encoding = "3Bar"] | ^^^^^^^^^^^^^^^^^^^^^^^^ | = note: see issue #89653 for more information = help: add `#![feature(cfi_encoding)]` to the crate attributes to enable = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0658`.