Remove legacy code that isn't used now that we require GHC >= 6.8

[ghc-hetmet.git] / compiler / utils / IOEnv.hs

diff --git a/compiler/utils/IOEnv.hs b/compiler/utils/IOEnv.hs
index 5f354f0..305e30e 100644 (file)
--- a/compiler/utils/IOEnv.hs
+++ b/compiler/utils/IOEnv.hs
@@ -139,15 +139,9 @@ unsafeInterleaveM (IOEnv m) = IOEnv (\ env -> unsafeInterleaveIO (m env))
 
 -- For use if the user has imported Control.Monad.Error from MTL
 -- Requires UndecidableInstances
-#if __GLASGOW_HASKELL__ > 606
--- for some reason, this doesn't compile with GHC 6.6:
--- utils/IOEnv.hs:144:33:
---     No instance for (MonadPlus IO)
---       arising from use of `mplus' at utils/IOEnv.hs:144:33-67
 instance MonadPlus IO => MonadPlus (IOEnv env) where
     mzero = IOEnv (const mzero)
     m `mplus` n = IOEnv (\env -> unIOEnv m env `mplus` unIOEnv n env)
-#endif
 
 ----------------------------------------------------------------------
 -- Accessing input/output