This has something to do with the Enum instance for NominalDiffTime: ghci> [0..2] :: [NominalDiffTime] ... Appears to also diverge. This works though: ghci> mapM_ putStrLn $ map (mkDated . fromIntegral) [0..2] 2015-01-01T00:00:00Z 2015-01-01T01:00:00Z 2015-01-01T02:00:00Z Ryan On Sun, Jan 18, 2015 at 7:45 PM, mariopal wrote:

This code produces an infinite output... why? it's a bug in ghc?

...

-- Glasgow Haskell Compiler, Version 7.6.3 on Debian Sid import System.Locale (defaultTimeLocale) import Data.Time

mkDated n = formatTime defaultTimeLocale "%FT%TZ" $ addUTCTime (3600*n) $ UTCTime (fromGregorian 2015 1 1) (timeOfDayToTime $ TimeOfDay 0 0 0)

main = mapM_ putStrLn $ map mkDated [0..2]

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe