小编y.w*_*est的帖子

doubles :: Floating -> Floating
doubles  =  (0.1 + 1.1) - 1.2

我在 Haskell 中收到此错误

• Expecting one more argument to ‘Floating’
      Expected a type, but ‘Floating’ has kind ‘* -> Constraint’
    • In the type signature: doubles :: Floating -> Floating
   |
32 | doubles :: Floating -> Floating 
   |                        ^^^^^^^^

当我尝试|>在 elm 中使用运算符时出现错误

kl : List Float
kl =
    List.map toFloat (List.range 1 10)

kll : Float
kll =
    let
        half x =
            x / 2
    in
    List.sum (List.map half (List.map toFloat (List.range 1 10)))

下面的代码我使用|>并得到一个错误：

klpipe : List Float
klpipe =
    1 10 |> List.range |> toFloat |> List.map