{"ast_node_type":"variable","tokens":[{"end":100,"kind":"keyword","start":0,"text":"let"}]}
                let res = self.context.new_call(self.location, count_leading_zeroes, &[arg]) - diff;
                let diff = self.context.new_rvalue_from_long(self.int_type, diff * 8);
                return self.context.new_cast(self.location, res, result_type);