Re: [Haskell-cafe] From Rabhi's & Lapalme's book 'Algorithms - A Functional Programming Approach' I'm getting a non-exhaustive pattern match

g!(x, y) can return 'Nothing' as well, but you are not considering it and therefore the non-exhaustive pattern. Best, Mukesh On Thu, Jul 22, 2021 at 12:21 PM Casey Hawthorne wrote:

From Rabhi's & Lapalme's book 'Algorithms - A Functional Programming Approach' 1999, I'm getting a non-exhaustive pattern match

weight x y g = w where (Just w) = g!(x,y)

I can't figure out why

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