[Gtk2hs-devel] darcs patch: fix build failure on ghc-7.4 (Eq constraints)

[Sergei T. <sl...@gm...>]

1 patch for repository http://code.haskell.org/gstreamer:

Mon Apr 23 09:58:12 FET 2012  Sergei Trofimovich <sl...@co...>
  * fix build failure on ghc-7.4 (Eq constraints)
  
  Media/Streaming/GStreamer/Core/Buffer.chs:216:13:
      Could not deduce (Eq numT) arising from a use of `/='
      from the context (BufferClass bufferT, Integral intT, Num numT)
        bound by the type signature for
                   marshalGetNum :: (BufferClass bufferT, Integral intT, Num numT) =>
                                    (Ptr Buffer -> IO intT) -> numT -> bufferT -> Maybe numT
        at Media/Streaming/GStreamer/Core/Buffer.chs:(213,1)-(218,22)
      Possible fix:
        add (Eq numT) to the context of
          the type signature for
            marshalGetNum :: (BufferClass bufferT, Integral intT, Num numT) =>
             (Ptr Buffer -> IO intT) -> numT -> bufferT -> Maybe numT
             In the expression: n /= invalid
             In the expression: if n /= invalid then Just n else Nothing
     In the expression:
         let
              n = fromIntegral
                  $ unsafePerformIO $ withMiniObject (toBuffer buffer) getAction
         in if n /= invalid then Just n else Nothing