{"ast_node_type":"variable","tokens":[{"end":100,"kind":"keyword","start":0,"text":"let"}]}
                                let rhs_pos = span.lo() + BytePos::from_usize(eq_idx + 2 + rhs_idx);
                            {
                                let rhs_span = span.with_lo(rhs_pos).with_hi(rhs_pos);