{"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"self.opt_item_name(id).unwrap_or_else(||"}]}
        self.opt_item_name(id).unwrap_or_else(|| {
        let id = id.into_query_param();
            bug!("item_name: no name for {:?}", self.def_path(id));