无法重现Hood（Haskell Object Observation Debugger）包文档

Question

为了更深入地了解表达式评估中涉及的中间步骤，我想尝试一下（http://hackage.haskell.org/package/hood）包。

在软件包的主页（http://ku-fpg.github.io/software/hood/）上，有一些引擎功能的例子，即这个例子：

import Debug.Hood.Observe

ex2 = print
    . reverse
    . (observe "intermediate")
    . reverse
    $ [1..9]
n = runO ex2

当我尝试运行此示例时，出现以下错误：

hoodTests.hs:10:10: error:
    • Ambiguous type variable ‘a0’ arising from the literal ‘1’
      prevents the constraint ‘(Num a0)’ from being solved.
      Probable fix: use a type annotation to specify what ‘a0’ should be.
      These potential instances exist:
        instance Num Integer -- Defined in ‘GHC.Num’
        instance Num Double -- Defined in ‘GHC.Float’
        instance Num Float -- Defined in ‘GHC.Float’
        ...plus two others
        (use -fprint-potential-instances to see them all)
    • In the expression: 1
      In the second argument of ‘($)’, namely ‘[1 .. 9]’
      In the expression:
        print . reverse . (observe "intermediate") . reverse $ [1 .. 9] Failed, modules loaded: none.

我想这意味着[1..9]应该有明确的类型，例如Int或Float。

然后我改变了这样的脚本：

import Debug.Hood.Observe

al :: [Int]
al = [0..9]

ex2 = print
    . reverse
    . (observe "intermediate")
    . reverse
    $ al
n = runO ex2

现在错误已消失，但输出不符合预期。而不是

[0,1,2,3,4,5,6,7,8,9]

-- intermediate
  9 : 8 : 7 : 6 : 5 : 4 : 3 : 2 : 1 : 0 : []

输出

*Main> n
[0,1,2,3,4,5,6,7,8,9]


*Main>

我认为包装是旧的，它最后更新为ghc-6.x并且我使用ghc-8。这是它不起作用的原因还是我错过了其他的东西？