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Haskell library for OpenBSD's pledge(2)

Example Haskell program:

import System.Pledge
import System.IO

main :: IO ()
main = do
  pledge [Stdio] []
  print "Pledge works"
  withFile "/dev/urandom" ReadMode $ \f ->
    hGetContents f >>= putStr

pledge(2) kills this when withFile tries to open file.