Jonathan Gilbert jpg0
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| import Control.Monad (guard) | |
| import Control.Monad.Trans.Maybe (MaybeT(..), runMaybeT) | |
| import Control.Monad.Error | |
| import Data.Char | |
| readBoth :: IO (Maybe String) | |
| readBoth = runMaybeT $ do a <- funA2 | |
| funB2 a | |