{"ast_node_type":"function","tokens":[{"end":81,"kind":"keyword","start":0,"text":"pub"}]}
    pub fn opt_rpitit_info(self, def_id: DefId) -> Option<ImplTraitInTraitData> {
    /// about where that RPITIT came from.
        if let DefKind::AssocTy = self.def_kind(def_id)