fix newer ghc: Don't try to be backwards compatible

src/compiler/GF/Compile/TypeCheck/ConcreteNew.hs

@@ -19,10 +19,6 @@ import GF.Text.Pretty
 import Data.List (nub, (\\), tails)
 import qualified Data.IntMap as IntMap
 import Data.Maybe(fromMaybe,isNothing)
-#if !MIN_VERSION_base(4,11,0)
--- Control.Monad.Fail import is redundant since GHC 8.8.1
-import qualified Control.Monad.Fail as Fail
-#endif
 
 checkLType :: GlobalEnv -> Term -> Type -> Check (Term, Type)
 checkLType ge t ty = runTcM $ do
@@ -651,16 +647,8 @@ instance Monad TcM where
                                 TcOk x ms msgs -> unTcM (g x) ms msgs
                                 TcFail    msgs -> TcFail msgs)
 
-#if !(MIN_VERSION_base(4,13,0))
+instance MonadFail TcM where
   fail     = tcError . pp
-#endif
-
-instance Fail.MonadFail TcM where
-  fail     = tcError . pp
-
-
--- Control.Monad.Fail import will become redundant in GHC 8.8+
-import qualified Control.Monad.Fail as Fail
 
 
 instance Applicative TcM where