[Haskell-cafe] Painting logs to get a coloured tree

[Luke Palmer]

2009/2/9 Joachim Breitner <mail at joachim-breitner.de>

> 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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