{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"Add"}]}
                    Add | AddUnchecked | AddWithOverflow => u128::overflowing_add,
                let op: fn(u128, u128) -> (u128, bool) = match bin_op {
                    Sub | SubUnchecked | SubWithOverflow => u128::overflowing_sub,