Ocaml错误消息错误：分析错误：[binding]（in[expr]）之后应为“in”

我试图写一个函数，计算n到m的除数，其中current是当前的除数，count是到目前为止的除数总数

最后一行代码的[expr]中的[binding]之后会出现错误：Parse error:in，但我不知道in怎么会是最后一行。我在这里做错了什么

    (* Counts the number of divisors*)
    let rec count_divisors (n: int) (m: int) (current: int) (count: int): int =
       if count > m || current > n then count
       else  if (n mod current) = 0 then count_divisors n m (current+1) (count+1)
       else (count_divisors n m (current+1) count);;

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我假设你在另一个函数中使用这个函数，因为它有很多参数，而我只需要一个参数——你想计算其除数的数字，对吗

如果是，请尝试将代码更改为以下内容：

let num_divisors n =
    let rec count_divisors (n: int) (m: int) (current: int) (count: int): int =
           if count > m || current > n then count
           else  if (n mod current) = 0 then count_divisors n m (current+1) (count+1)
           else (count_divisors n m (current+1) count)
    in count_divisors n n 1 0;;