X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Futils%2FMaybes.lhs;h=7d1fa4e306957a69621b81c695c7b06a4afb65d0;hb=2423c249f5ca7785d0ec89eb33e72662da7561c1;hp=3c9bd693e6d944f8bfe23f7c59f728bb60ee090b;hpb=0065d5ab628975892cea1ec7303f968c3338cbe1;p=ghc-hetmet.git

diff --git a/compiler/utils/Maybes.lhs b/compiler/utils/Maybes.lhs
index 3c9bd69..7d1fa4e 100644
--- a/compiler/utils/Maybes.lhs
+++ b/compiler/utils/Maybes.lhs
@@ -1,14 +1,14 @@
 %
+% (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,
+	failME, isSuccess,
 
 	orElse, 
 	mapCatMaybes,
@@ -22,8 +22,7 @@ module Maybes (
 
 #include "HsVersions.h"
 
-import Maybe
-
+import Data.Maybe
 
 infixr 4 `orElse`
 \end{code}
@@ -118,6 +117,10 @@ instance Monad (MaybeErr err) where
   Succeeded v >>= k = k v
   Failed e    >>= k = Failed e
 
+isSuccess :: MaybeErr err val -> Bool
+isSuccess (Succeeded {}) = True
+isSuccess (Failed {})    = False
+
 failME :: err -> MaybeErr err val
 failME e = Failed e
 \end{code}