{"ast_node_type":"variable","tokens":[{"end":59,"kind":"keyword","start":0,"text":"let"}]}
        let mut fields: ThinVec<PatField> = ThinVec::new();
    fn parse_pat_fields(&mut self) -> PResult<'a, (ThinVec<PatField>, PatFieldsRest)> {
        let mut etc = PatFieldsRest::None;