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jb55/failures.hs

Created September 15, 2014 19:57
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failures.hs
type Error = Text
type Url = Text
downloadPage :: Url -> IO (Either Error Text)
downloadPage url = -- ...
operations :: [Url] -> IO ()
operations urls = do
pages :: [Either Error Text]
pages <- concurrentMap downloadPage urls
let failures = filter isLeft pages
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