{"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
                        let lo = span.lo() + BytePos::from_usize(i);
                    let span = if (span.hi() - span.lo()).to_usize() == s.len() {
                        let hi = lo + BytePos::from_usize(1);