final revision to GArrow classes

[ghc-base.git] / Foreign / Marshal / Utils.hs

diff --git a/Foreign/Marshal/Utils.hs b/Foreign/Marshal/Utils.hs
index 7fcacfa..bf9bdb3 100644 (file)
--- a/Foreign/Marshal/Utils.hs
+++ b/Foreign/Marshal/Utils.hs
@@ -1,4 +1,5 @@
-{-# OPTIONS_GHC -XNoImplicitPrelude #-}
+{-# LANGUAGE CPP, NoImplicitPrelude, ForeignFunctionInterface #-}
+
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Foreign.Marshal.Utils
@@ -117,8 +118,8 @@ toBool  = (/= 0)
 --
 -- * the 'nullPtr' is used to represent 'Nothing'
 --
-maybeNew :: (      a -> IO (Ptr a))
-         -> (Maybe a -> IO (Ptr a))
+maybeNew :: (      a -> IO (Ptr b))
+         -> (Maybe a -> IO (Ptr b))
 maybeNew  = maybe (return nullPtr)
 
 -- |Converts a @withXXX@ combinator into one marshalling a value wrapped