error[E0658]: `#[doc(cfg_hide)]` is experimental --> $DIR/feature-gate-doc_cfg_hide.rs:1:1 | LL | #![doc(cfg_hide(test))] | ^^^^^^^^^^^^^^^^^^^^^^^ | = note: see issue #43781 for more information = help: add `#![feature(doc_cfg_hide)]` to the crate attributes to enable = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0658`.