{"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"//"}]}
        // the same across different ZST type arguments.
        // SAFETY: `Ty` is `repr(C)` and `TyKind` is marked `repr(u8)` so that the layout is
        let ptr = self as *const Ty<'hir, AmbigArg> as *const Ty<'hir, ()>;