未定义的数据构造函数“？”在Hugs intepreter

Question

尝试将文件加载到拥抱时发生奇怪错误：

@model CMS.DomainClass.Configuration 
@{
    ViewBag.Title = "تنظیمات سایت";
    Layout = "~/Areas/FAdmin/Views/Shared/_FAdminMaster.cshtml";
}

<!-- Content Header (Page header) -->
<section class="content-header">
    <h1>تنظیمات

    </h1>

</section>


@using (@Html.BeginForm("Create", "Configuration", FormMethod.Post,
    new { id = "form", enctype = "multipart/form-data" }))
{

    if (TempData["Error"] != null)
    {
    <div class="pad margin no-print">
        <div class="callout callout-info" style="margin-bottom: 0!important;background-color: #ea0000 !important;">
            <h4>پیام:</h4>
            @TempData["Error"]
        </div>
    </div>
    }
    if (TempData["Information"] != null)
    {
    <div class="pad margin no-print">
        <div class="callout callout-info" style="margin-bottom: 0!important;background-color: orangered !important">
            <h4>پیام:</h4>
            @TempData["Information"]
        </div>
    </div>
    }
    if (TempData["Success"] != null)
    {
    <div class="pad margin no-print">
        <div class="callout callout-info" style="margin-bottom: 0!important;background-color: #00A65A !important">
            <h4>پیام:</h4>
            @TempData["Success"]
        </div>
    </div>
    }
    <div class="row">
        <!-- left column -->
        <div class="col-md-6">
            <!-- general form elements -->
            <div class="box box-primary">
                <div class="box-header with-border">
                    <h3 class="box-title">اطلاعات پایه</h3>
                </div>
                <!-- /.box-header -->
                <!-- form start -->
                <div class="box-body">
                    <div class="form-group">
                        <label for="Title">عنوان سایت</label>
                        <input class="form-control" id="Title" name="Title" type="text">
                    </div>
                    <div class="form-group">
                        <label for="WebSite">وب سایت</label>
                        <input class="form-control" id="WebSite" name="WebSite" type="tel">
                    </div>
                    <div class="form-group">
                        <label for="Email">ایمیل</label>
                        <input class="form-control" id="Email" name="Email" type="tel">
                    </div>
                    <div class="form-group">
                        <label for="ImgByte">لوگو</label>
                        <input id="ImgByte" name="ImgByte" type="file">
                        <p class="help-block">سایز : 33*114</p>
                    </div>
                </div>
                <!-- /.box-body -->

            </div>
            <!-- /.box -->

        </div>
        <!--/.col (left) -->
        <!-- right column -->
        <div class="col-md-6">
            <!-- Horizontal Form -->
            <div class="box box-primary">
                <div class="box-header with-border">
                    <h3 class="box-title">اطلاعات پایه</h3>
                </div>
                <!-- /.box-header -->
                <!-- form start -->
                <div class="box-body">
                    <div class="form-group">
                        <label for="Telephone">تلفن</label>
                        <input class="form-control" id="Telephone" name="Telephone" type="tel">
                    </div>
                    <div class="form-group">
                        <label for="Fax">فکس</label>

                        <input class="form-control" id="Fax" name="Fax" type="tel">
                    </div>
                    <div class="form-group">
                        <label for="ZipCode">کد پستی</label>

                        <input class="form-control" id="ZipCode" name="ZipCode" type="number">
                    </div>
                    <div class="form-group">
                        <label for="ZipCode">آدرس</label>

                        <textarea class="form-control" rows="3" id="Address" name="Address"></textarea>

                    </div>
                    <div class="form-group">
                        <label for="GPS">GPS</label>

                        <input class="form-control" id="GPS" name="GPS" type="text">
                    </div>
                </div>
                <!-- /.box-body -->
            </div>
            <!-- /.box -->

        </div>
        <!--/.col (right) -->
    </div>
    <div class="row">
        <div class="box-footer" style="direction: ltr">
            <button type="submit" class="btn btn-success">ذخیره</button>
            <button type="submit" class="btn btn-gray">انصراف</button>

        </div>
    </div>
}

文件的完整内容（是，一行）：

Hugs> :l test.hs
ERROR "test.hs":3 - Undefined data constructor "?"

任何人都可以启发我吗？

注意：尝试在ghci中加载相同的文件也不起作用，但出于有意义的原因：

test :: [a] -> ([a],[a])