error[E0658]: `#[doc(cfg)]` is experimental --> $DIR/feature-gate-doc_cfg.rs:1:1 | LL | #[doc(cfg(unix))] | ^^^^^^^^^^^^^^^^^ | = note: see issue #43781 for more information = help: add `#![feature(doc_cfg)]` to the crate attributes to enable error: aborting due to previous error For more information about this error, try `rustc --explain E0658`.