Hi Graham, There is one implementation here: http://code.haskell.org/yi/Data/Tree/ I wrote it for Yi but it is quite general. It is a pity that we don't have it in the standard libraries. It is not completely tested but it seems to work for me. Regards, Krasimir 2008/4/23 Graham Fawcett :

Hi folks,

Is there a common zipper implementation for the "Tree a" datatype, defined in Data.Tree? The wiki gives examples for binary trees and B-trees, but not for these.

Thanks, Graham

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