{"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"if"}]}
        if doc_alias == sym::empty {
            &format!("`#[doc(alias{})]`", if is_list { "(\"...\")" } else { " = \"...\"" });
            tcx.dcx().emit_err(errors::DocAliasEmpty { span, attr_str });