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miaout17/gist:154453

Created July 24, 2009 18:08
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gistfile1.hs
import Control.Monad.State
type IntState = State Int
inc :: IntState ()
inc = do
v <- get
put (v + 1)
twice :: IntState ()
twice = modify ( * 2 )
calculate = do
twice
inc
twice
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