Merge pull request #427 from a5ob7r/compatible_with_mtl_2.3

Fix compatibilities with mtl 2.3.1

src/XMonad/Core.hs

@@ -44,9 +44,10 @@ import Control.Exception (fromException, try, bracket_, throw, finally, SomeExce
 import qualified Control.Exception as E
 import Control.Applicative ((<|>), empty)
 import Control.Monad.Fail
+import Control.Monad.Fix (fix)
 import Control.Monad.State
 import Control.Monad.Reader
-import Control.Monad (void)
+import Control.Monad (filterM, guard, liftM2, void, when)
 import Data.Semigroup
 import Data.Traversable (for)
 import Data.Time.Clock (UTCTime)

src/XMonad/Main.hs

@@ -26,6 +26,7 @@ import qualified Data.Map as M
 import qualified Data.Set as S
 import Control.Monad.Reader
 import Control.Monad.State
+import Control.Monad (filterM, guard, unless, void, when)
 import Data.Maybe (fromMaybe, isJust)
 import Data.Monoid (getAll)
 

src/XMonad/Operations.hs

@@ -71,9 +71,10 @@ import qualified Data.Map as M
 import qualified Data.Set as S
 
 import Control.Arrow (second)
+import Control.Monad.Fix (fix)
 import Control.Monad.Reader
 import Control.Monad.State
-import Control.Monad (void)
+import Control.Monad (forM, forM_, guard, join, unless, void, when)
 import qualified Control.Exception as C
 
 import System.IO