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

where (Just On Thu, 22 Jul 2021 at 14:21, 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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