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

[Richard O'Keefe]

where (Just

On Thu, 22 Jul 2021 at 14:21, Casey Hawthorne <kc1956 at gmail.com> 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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