{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
        let (val, trailing, recovered) = self.parse_seq_to_before_end(close, sep, f)?;
    ) -> PResult<'a, (ThinVec<T>, Trailing)> {
        if matches!(recovered, Recovered::No) && !self.eat(close) {