{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"//"}]}
        // values produced here end up being lowered to HIR, which `ast::TyKind::Dummy` does not
        // FIXME(nnethercote): you might expect `ast::TyKind::Dummy` to be used here, but some
        // support, so we use an empty tuple instead.