F#尾部。头部加列表

我正试图编写一些用于处理多项式的F#代码，作为其中的一部分，我想将列表中的重复元素合并到单个元素中。以下是相关代码：

type PolynomialElem(Coeff : double, Power : int) =
  member x.Coeff = Coeff
  member x.Power = Power
let rec removeDuplicates (inlist:list<PolynomialElem>) (outlist:list<PolynomialElem>) =   
    match inlist with
        |head:: tail ->if head.Power = tail.Head.Power then
                            PolynomialElem(head.Coeff + tail.Head.Coeff) :: removeDuplicates tail.Tail
                        else
                            head :: (removeDuplicates(tail))
        |[] -> []      

此外，编译器对我连接列表的方式感到不满意，并说：

This expression was expected to have type PolynomialElem list but here has type PolynomialElem list -> PolynomialElem list      

---

有什么帮助吗？

以下是编译的代码：

type PolynomialElem(Coeff : double, Power : int) =
  member x.Coeff = Coeff
  member x.Power = Power
let rec removeDuplicates (inlist:list<PolynomialElem>)  =   
    match inlist with
        |head:: tail ->if head.Power = tail.Head.Power then
                            PolynomialElem(head.Coeff + tail.Head.Coeff, head.Power) :: removeDuplicates tail.Tail
                        else
                            head :: (removeDuplicates(tail))
        |[] -> []      

类型多项式lem（系数：双精度，幂：整数）=
成员x.系数=系数
成员x.权力=权力
让rec移除副本（inlist:list）=
在列表中匹配
|head:：tail->如果head.Power=tail.head.Power，则
多项式lem（head.Coeff+tail.head.Coeff，head.Power）：：移除复制tail.tail
其他的
头：：（拆下两个（尾））
|[] -> []      

您忘记了传递给polynomialem的第二个参数（幂）

您有一些未使用/不需要的“outlist”参数

type PolynomialElem(Coeff : double, Power : int) =
  member x.Coeff = Coeff
  member x.Power = Power
let rec removeDuplicates (inlist:list<PolynomialElem>)  =   
    match inlist with
        |head:: tail ->if head.Power = tail.Head.Power then
                            PolynomialElem(head.Coeff + tail.Head.Coeff, head.Power) :: removeDuplicates tail.Tail
                        else
                            head :: (removeDuplicates(tail))
        |[] -> []