Got error when I wrote like this:
(int balance, _) = get_balance();


Error:
Error: Func compilation error: contracts/jetton/jetton.fc:273:37: error: cannot assign an expression of type [int, cell] to a variable or pattern of type (int, ??304): cannot unify type (int, ??304) with [int, cell]
(int balance, _) = get_balance();