add TypeOperators for preempting error

mono-traversable/src/Data/Containers.hs

@@ -4,6 +4,7 @@
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE TypeOperators #-}
 -- | Warning: This module should be considered highly experimental.
 module Data.Containers where
 

mono-traversable/src/Data/MonoTraversable/Unprefixed.hs

@@ -1,6 +1,7 @@
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 -- | The functions in "Data.MonoTraversable" are all prefixed with the letter
 -- @o@ to avoid conflicts with their polymorphic counterparts. This module
 -- exports the same identifiers without the prefix, for all cases where the

mono-traversable/src/Data/Sequences.hs

@@ -5,6 +5,7 @@
 {-# LANGUAGE ConstraintKinds #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE FunctionalDependencies #-}
+{-# LANGUAGE TypeOperators #-}
 -- | Abstractions over sequential data structures, like lists and vectors.
 module Data.Sequences where
 

mutable-containers/bench/deque.hs

@@ -1,5 +1,6 @@
 {-# LANGUAGE ConstraintKinds #-}
 {-# LANGUAGE TypeFamilies    #-}
+{-# LANGUAGE TypeOperators #-}
 import Control.Monad
 import Gauge.Main
 import Data.Mutable

mutable-containers/bench/ref.hs

@@ -1,4 +1,5 @@
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 import Control.Monad
 import Gauge.Main
 import Data.Mutable

mutable-containers/src/Data/Mutable/Class.hs

@@ -2,6 +2,7 @@
 {-# LANGUAGE FlexibleContexts  #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE TypeFamilies      #-}
+{-# LANGUAGE TypeOperators #-}
 -- | Various typeclasses for mutable containers.
 module Data.Mutable.Class
     ( PrimMonad

mutable-containers/test/Spec.hs

@@ -1,5 +1,6 @@
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE TypeOperators #-}
 
 import Control.Monad             (forM_)
 import Data.Mutable