{"ast_node_type":"function","tokens":[{"end":86,"kind":"keyword","start":0,"text":"pub"}]}
    pub fn opt_item_ident(self, def_id: impl IntoQueryParam<DefId>) -> Option<Ident> {
    /// See [`item_name`][Self::item_name] for more information.
        let def_id = def_id.into_query_param();