Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/prelude/List/ElemBy.hs

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Distributed under the MIT License.
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module List where

elemBy        :: (a -> a -> Bool) -> a -> [a] -> Bool
elemBy eq _ []          =  False
elemBy eq x (y:ys)      =  x `eq` y || elemBy eq x ys

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