tests/rustdoc/extern/hidden-extern-34025.rs

// https://github.com/rust-lang/rust/issues/34025
#![crate_name = "foo"]

//@ !has 'foo/sys/index.html'
//@ !has 'foo/sys/sidebar-items.js'
#[doc(hidden)]
pub mod sys {
    extern "C" {
        //@ !has 'foo/sys/fn.foo.html'
        #[doc(hidden)]
        pub fn foo();
    }
}