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Add MonadFail for Generator for GHC 8.6
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@ -52,6 +52,7 @@ import GHC.TypeLits
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import Control.Lens
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import qualified Control.Monad.Cont as Ct
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import qualified Control.Monad.Except as ET
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import Control.Monad.Fail
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import qualified Control.Monad.Reader as Rd
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import Control.Monad.ST ( ST )
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import qualified Control.Monad.State.Strict as St
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@ -248,6 +249,9 @@ instance St.MonadState (GenState arch ids s) (Generator arch ids s) where
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instance ET.MonadError GeneratorError (Generator arch ids s) where
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throwError e = Generator (Ct.ContT (\_ -> ET.throwError e))
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instance MonadFail (Generator arch ids s) where
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fail err = ET.throwError $ GeneratorMessage $ show err
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-- | The type of continuations provided by 'shiftGen'
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type GenCont arch ids s a = a -> GenState arch ids s -> ET.ExceptT GeneratorError (ST s) (GenResult arch ids)
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