[Haskell-cafe] Data.Tree.Zipper in the standard libraries

Jules Bean jules at jellybean.co.uk
Fri May 23 11:09:10 EDT 2008

Miguel Mitrofanov wrote:
> I think that MonadZero m => ... is better than just Maybe. If you can 
> have more general solution for free, why fight it?

Because Maybe exists and MonadZero doesn't?


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