tests/ui/rustdoc/feature-gate-doc_primitive.rs - rust-lang/rust - Git at Google

 #[rustc_doc_primitive = "usize"]
 //~^ ERROR use of an internal attribute [E0658]
 //~| NOTE the `#[rustc_doc_primitive]` attribute is an internal implementation detail that will never be stable
 //~| NOTE the `#[rustc_doc_primitive]` attribute is used by the standard library to provide a way to generate documentation for primitive types
 /// Some docs
 mod usize {}

 fn main() {}
	#[rustc_doc_primitive = "usize"]
	//~^ ERROR use of an internal attribute [E0658]
	//~\| NOTE the `#[rustc_doc_primitive]` attribute is an internal implementation detail that will never be stable
	//~\| NOTE the `#[rustc_doc_primitive]` attribute is used by the standard library to provide a way to generate documentation for primitive types
	/// Some docs
	mod usize {}

	fn main() {}