f# - 涉及 “Expected incomplete structured construct”的级联错误

Question

给出以下代码:

namespace Backend

open System
open System.Linq
open Npgsql

module helpers =
    let rec second_elms lst =
        match lst with
        | [] -> []
        | (d,o)::xs -> o::(second_elms xs)

    let folder acc elm =
        let result_list,acc_to_substract = acc
        result_list::(elm-acc_to_substract),elm

type ChartManager() =

    static member ConvertOutputNumbersToDifferenceSegments(listOfOutputValuesForADay: list<DateTime*int>) =

        let secs = helpers.second_elms listOfOutputValuesForADay

        let trans = List.fold
            helpers.folder
            ([],snd(secs.First()))
            secs.Tail

        let sndDateTime = fst(listOfOutputValuesForADay.ElementAt(1))

        for each_output in fst(trans) do
            yield (sndDateTime,each_output)

这给了我很多错误，但是我想大多数只是“trans”块中主要错误的级联错误，它表示(突出显示 helpers):

Unexpected identifier in binding. Expected incomplete structured construct at or before this point or other token.

这是什么意思？？

Answer 1

正确缩进简单语法

 let trans = 
       List.fold
           helpers.folder
           ([],snd(secs.First()))
           secs.Tail

要么

 let trans = List.fold
                helpers.folder
                ([],snd(secs.First()))
                secs.Tail

如果是单个语句，则要在多行上拆分，您需要缩进传递语句的开头。