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Define a MonadFail instance for Evaluator.

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This commit is contained in:
Rob Rix 2018-02-28 10:41:28 -05:00
parent 57f478a5ac
commit b9ac2858ec
1 changed files with 4 additions and 0 deletions
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4
src/Analysis/Abstract/Evaluator.hs
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@ -8,6 +8,7 @@ import Control.Monad.Effect.NonDetEff
import Control.Monad.Effect.Reader
import Control.Monad.Effect.State
import Data.Abstract.Value
import Prelude hiding (fail)
data Evaluator effects value a
= Evaluator
@ -37,3 +38,6 @@ instance Monad (Evaluator effects value) where
return = pure
Evaluator runA >>= f = Evaluator (runA >>= runEvaluator . f)
instance MonadFail (Evaluator effects value) where
fail s = Evaluator (fail s)