On Sun, 26 Oct 2008, Hugo Pacheco wrote:

Hi all,
I have been searching for examples of Haskell "real scenarios" that employ
mutually recursive datatype definitions.
Does anyone know some interesting libraries or structures that I could play
with?

http://darcs.haskell.org/wraxml/src/Data/Tree/BranchLeafTag.hs

Here Elem uses Tree.T and Tree.T uses Elem. Is this what you are looking for?
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