{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"ast::FieldList::RecordFieldList(_)"}]}
                ast::FieldList::RecordFieldList(_) => None,
            let tfl = self.field_list().and_then(|fl| match fl {
                ast::FieldList::TupleFieldList(it) => Some(it),