X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Futils%2FMaybes.lhs;h=af7d3f6ca51c3e3fecfc88dcf6a26426702d969e;hb=84923cc7de2a93c22a2f72daf9ac863959efae13;hp=f1f859a5ea3d7e60fdd5232cd54c55e1acdb4c96;hpb=2763f56de2097a34176aa883dd4f0b3de1cb896c;p=ghc-hetmet.git

diff --git a/compiler/utils/Maybes.lhs b/compiler/utils/Maybes.lhs
index f1f859a..af7d3f6 100644
--- a/compiler/utils/Maybes.lhs
+++ b/compiler/utils/Maybes.lhs
@@ -1,11 +1,11 @@
 %
+% (c) The University of Glasgow 2006
 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
 %
-\section[Maybes]{The `Maybe' types and associated utility functions}
 
 \begin{code}
 module Maybes (
-	module Maybe,		-- Re-export all of Maybe
+	module Data.Maybe,	-- Re-export all of Maybe
 
 	MaybeErr(..),	-- Instance of Monad
 	failME, isSuccess,
@@ -17,13 +17,12 @@ module Maybes (
 	expectJust,
 	maybeToBool,
 
-	thenMaybe, seqMaybe, returnMaybe, failMaybe
+	thenMaybe, seqMaybe, returnMaybe, failMaybe, fmapMMaybe
     ) where
 
 #include "HsVersions.h"
 
-import Maybe
-
+import Data.Maybe
 
 infixr 4 `orElse`
 \end{code}
@@ -101,6 +100,11 @@ failMaybe = Nothing
 orElse :: Maybe a -> a -> a
 (Just x) `orElse` y = x
 Nothing  `orElse` y = y
+
+fmapMMaybe :: Monad m => (a -> m b) -> Maybe a -> m (Maybe b)
+fmapMMaybe f Nothing  = return Nothing
+fmapMMaybe f (Just x) = f x >>= \x' -> return (Just x')
+
 \end{code}