{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"if"}]}
        if !$has_feature && !$span.allows_unstable($name) {
    ($visitor:expr, $has_feature:expr, $name:expr, $span:expr, $explain:expr) => {{
            #[allow(rustc::untranslatable_diagnostic)] // FIXME: make this translatable