{"ast_node_type":"variable","tokens":[{"end":96,"kind":"keyword","start":0,"text":"let"}]}
        let expected = self.expected.iter().map(|name| format!("`{name}`")).collect::<Vec<_>>();
    fn into_diag(self, dcx: DiagCtxtHandle<'a>, level: Level) -> Diag<'a, G> {
        Diag::new(dcx, level, fluent::attr_parsing_unknown_meta_item)