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{-# LANGUAGE Arrows #-}
import Control.Arrow
import qualified Control.Category as Cat
test :: Int -> Int
test = proc x -> do
let neg = x < 0
case x of
x | neg -> returnA -< 0 -- GHC panics
--x | x < 0 -> returnA -< 0 -- GHC doesn't panic
_ -> returnA -< 10
main = do
print $ test (-1)
print $ test 1
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