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AccumT is a regular transformer and should have a regular MonadAccum instance. #141

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AccumT is a regular transformer and should have a regular MonadAccum instance. #141

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3 changes: 1 addition & 2 deletions Control/Monad/Accum.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -109,7 +109,6 @@ import qualified Control.Monad.Trans.Writer.CPS as CPSWriter
import qualified Control.Monad.Trans.Writer.Lazy as LazyWriter
import qualified Control.Monad.Trans.Writer.Strict as StrictWriter
import Data.Functor (($>))
import Data.Functor.Identity (Identity)
import Data.Kind (Type)

-- | The capability to accumulate. This can be seen in one of two ways:
Expand Down Expand Up @@ -160,7 +159,7 @@ class (Monoid w, Monad m) => MonadAccum w m | m -> w where
{-# MINIMAL accum | look, add #-}

-- | @since 2.3
instance (Monoid w) => MonadAccum w (AccumT w Identity) where
instance (Monoid w, Monad m) => MonadAccum w (AccumT w m) where
look = Accum.look
add = Accum.add
accum = Accum.accum
Expand Down