[Haskell-beginners] Are these soloutions all valid and a good use of Haskell

Benjamin Edwards edwards.benj at gmail.com
Mon Nov 10 17:07:02 UTC 2014

> It is complining but as soon as I want to run it , I see this message :

> Non-exhaustive patterns in function acc

Yep, Maybe has two constructors, and you are only handling one. You should
handle the Nothing case as well.
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