error[E0658]: `#[doc(masked)]` is experimental --> $DIR/feature-gate-doc_masked.rs:1:1 | LL | #[doc(masked)] | ^^^^^^^^^^^^^^ | = note: see issue #44027 for more information = help: add `#![feature(doc_masked)]` to the crate attributes to enable error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0658`.