note: MonadIO class
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@ -27,6 +27,7 @@ import Data.IORef (IORef, readIORef, writeIORef, newIORef)
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import Control.Monad (liftM)
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import Control.Monad.Base (MonadBase,liftBase)
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--import Control.Monad.IO.Class (MonadIO)
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import Control.Monad.Trans.RWS.Lazy (RWST,runRWST)
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import Control.Monad.Trans.Control (MonadBaseControl(..), StM, liftBaseWith
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, control, liftBaseOp, liftBaseOp_)
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