Add test

Signed-off-by: xizheyin <[email protected]>

Author: xizheyin

tests/rustdoc/doc-hidden-source.rs

@@ -13,4 +13,4 @@ pub use crate::Bar as A;
 pub use crate::A as B;
 //@ has - '//dt/a[@class="struct"]' 'C'
 #[doc(inline)]
-pub use crate::Bar as C;
+pub use crate::Bar as C;