It looks like a CSS rule is being applied incorrectly. It also looks weird if you click through to the type alias's page (`Visibilities`). ### [nightly](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/struct.MacroDef.html) (incorrect)  ### [beta](https://doc.rust-lang.org/beta/nightly-rustc/rustc_hir/struct.MacroDef.html) (correct) 