From: Ross Paterson <ross@soi.city.ac.uk>
Date: Wed, 20 Jun 2007 00:03:43 +0000 (+0000)
Subject: Hugs now gets MonadFix(mfix) from its prelude
X-Git-Url: http://git.megacz.com/?a=commitdiff_plain;h=f3f90f1ce9063cf63ea75318440b7fc6809350ef;p=ghc-base.git

Hugs now gets MonadFix(mfix) from its prelude
---

diff --git a/Control/Monad/Fix.hs b/Control/Monad/Fix.hs
index ea481d8..6196f73 100644
--- a/Control/Monad/Fix.hs
+++ b/Control/Monad/Fix.hs
@@ -26,7 +26,11 @@ import Prelude
 import System.IO
 import Control.Monad.Instances ()
 import Data.Function (fix)
+#ifdef __HUGS__
+import Hugs.Prelude (MonadFix(mfix))
+#endif
 
+#ifndef __HUGS__
 -- | Monads having fixed points with a \'knot-tying\' semantics.
 -- Instances of 'MonadFix' should satisfy the following laws:
 --
@@ -51,6 +55,7 @@ class (Monad m) => MonadFix m where
 	-- output fed back as the input.  Hence @f@ should not be strict,
 	-- for then @'mfix' f@ would diverge.
 	mfix :: (a -> m a) -> m a
+#endif /* !__HUGS__ */
 
 -- Instances of MonadFix for Prelude monads