[Haskell-beginners] A problem about Haskell 99 questions

[amazingjxq]

In problem 7 <http://www.haskell.org/haskellwiki/99_questions/1_to_10>, 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.
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