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{-# LANGUAGE Arrows #-}
{-# LANGUAGE QualifiedDo #-}
import Control.Arrow
import Prelude as P
main = runKleisli kleisliIO 1
-- Tests the error message when a qualified do
-- is used in a command.
kleisliIO = proc x -> P.do
y <- arr id -< x+1
Kleisli print -< 2*y
let z = x+y
t <- arr id -< x*z
returnA -< t+z
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