2009/2/9 Joachim Breitner <[email protected]> > Now while this works, and while ST is still somewhat pure, I'm wondering > if there is no better way of expressing "This piece of information came > from the point in a data structure, so something else can be put here > easily".
You might want to look into zippers: http://haskell.org/haskellwiki/Zipper Luke
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