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yelouafi/stream-span.hs

Created July 17, 2015 01:56
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stream-span.hs
span :: (a -> Bool) -> [a] -> ([a],[a])
span _ this@[] = (this, this)
span p this@(x:xs)
| p x = let (ys,zs) = span p xs in (x:ys,zs)
| otherwise = ([],this)
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