error[E0658]: `#[doc(notable_trait)]` is experimental --> $DIR/feature-gate-doc_notable_trait.rs:1:1 | LL | #[doc(notable_trait)] | ^^^^^^^^^^^^^^^^^^^^^ | = note: see issue #45040 for more information = help: add `#![feature(doc_notable_trait)]` to the crate attributes to enable error: aborting due to previous error For more information about this error, try `rustc --explain E0658`.