Generalize the type of Foreign.Marshal.Utils.maybeNew; fixes trac #5044

git conversion of:
Tue Mar  8 22:31:07 CET 2011  Bas van Dijk <v.dijk.bas@gmail.com>
  * Generalize the type of Foreign.Marshal.Utils.maybeNew
  This makes it consistent with maybeWith

diff --git a/Foreign/Marshal/Utils.hs b/Foreign/Marshal/Utils.hs
index 5ae677a..bf9bdb3 100644 (file)
--- a/Foreign/Marshal/Utils.hs
+++ b/Foreign/Marshal/Utils.hs
@@ -118,8 +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