1error[E0658]: `rustc_doc_primitive` is a rustc internal attribute 2 --> $DIR/feature-gate-doc_primitive.rs:1:1 3 | 4LL | #[rustc_doc_primitive = "usize"] 5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 6 | 7 = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable 8 9error: aborting due to previous error 10 11For more information about this error, try `rustc --explain E0658`. 12