Remove MonadZero instances.

Author: thomashoneyman

src/Data/List/Lazy/Types.purs

@@ -8,7 +8,6 @@ import Control.Comonad (class Comonad)
 import Control.Extend (class Extend)
 import Control.Lazy as Z
 import Control.MonadPlus (class MonadPlus)
-import Control.MonadZero (class MonadZero)
 import Control.Plus (class Plus)
 import Data.Eq (class Eq1, eq1)
 import Data.Foldable (class Foldable, foldMap, foldl, foldr)
@@ -185,8 +184,6 @@ instance plusList :: Plus List where
 
 instance alternativeList :: Alternative List
 
-instance monadZeroList :: MonadZero List
-
 instance monadPlusList :: MonadPlus List
 
 instance extendList :: Extend List where

src/Data/List/Types.purs

@@ -14,7 +14,6 @@ import Control.Apply (lift2)
 import Control.Comonad (class Comonad)
 import Control.Extend (class Extend)
 import Control.MonadPlus (class MonadPlus)
-import Control.MonadZero (class MonadZero)
 import Control.Plus (class Plus)
 import Data.Eq (class Eq1, eq1)
 import Data.Foldable (class Foldable, foldl, foldr, intercalate)
@@ -173,8 +172,6 @@ instance plusList :: Plus List where
 
 instance alternativeList :: Alternative List
 
-instance monadZeroList :: MonadZero List
-
 instance monadPlusList :: MonadPlus List
 
 instance extendList :: Extend List where