{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"Err(Determinacy::Undetermined)"}]}
                        Err(Determinacy::Undetermined) => {
                        Ok(_) | Err(Determinacy::Determined) => self.dummy_ext(MacroKind::Derive),
                            assert!(self.derive_data.is_empty());