Cris Okasaki [http://www.cs.columbia.edu/~cdo] has written tons of papers on functional data structures, I guess you can steal code from there. There was also a file containing all the examples from his book `Purely Functional Data Structures' (Cambridge University Press, 1998, and everybody sais it's a must although I haven't seen it yet). Unfortunately, I could not find it any more. Matthias Maldonado Castiblanco Camilo Ernesto <2003250@mail.escuelaing.edu.co> writes:

I need a class tree for haskell. where can i find it?

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