{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"Either::Right(source)"}]}
                Either::Right(source) => res[keys::RECORD_FIELD].insert(AstPtr::new(&source), id),
                Either::Left(source) => res[keys::TUPLE_FIELD].insert(AstPtr::new(&source), id),
            }