[Haskell-beginners] A problem about Haskell 99 questions

[Arlen Cuss]

On Tue, 2011-05-17 at 17:51 +0800, amazingjxq wrote:
> In problem 7, the example in haskell is below:
> 
>         *Main> flatten (Elem 5)
>         [5]
>         *Main> flatten (List [Elem 1, List [Elem 2, List [Elem 3, Elem 4], Elem 5]])
>         [1,2,3,4,5]
>         *Main> flatten (List [])
>         []
>  What are the functions List and Elem? I cann't hoogle it.

Those would be type constructors for the aforementioned "nested list
structure." I'm not sure if defining that type is part of the problem,
so I won't give it away!

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