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{-# LANGUAGE Arrows #-}
module ShouldCompile where
import Control.Arrow
f :: Arrow a => a (Int,Int,Int) Int
f = proc (x,y,z) -> returnA -< x+y
g :: Arrow a => Int -> a Int Int
g x = proc y -> returnA -< x*y
h :: Arrow a => Int -> a (Int,Int) Int
h x = proc (y,z) -> do
a <- f -< (x,y,3)
b <- g (2+x) -< y+a
returnA -< a*b+z
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