For anyone interested, here's a patch I came up with that seems to fix the build failure. I'm trying now to reach the relevant parties to get this included in the package.

diff -rN -u old-hs-plugins/src/System/Plugins/Load.hs new-hs-plugins/src/System/Plugins/Load.hs --- old-hs-plugins/src/System/Plugins/Load.hs 2011-12-30 17:52:37.000000000 -0500 +++ new-hs-plugins/src/System/Plugins/Load.hs 2011-12-30 17:52:37.000000000 -0500
@@ -84,7 +84,9 @@
 import System.Directory         ( doesFileExist, removeFile )
 import Foreign.C.String         ( CString, withCString, peekCString )

+#if !MIN_VERSION_ghc(7,2,0)
 import GHC                      ( defaultCallbacks )
+#endif
 import GHC.Ptr                  ( Ptr(..), nullPtr )
 import GHC.Exts                 ( addrToHValue# )
 import GHC.Prim                 ( unsafeCoerce# )
@@ -99,7 +101,12 @@
 readBinIface' :: FilePath -> IO ModIface
 readBinIface' hi_path = do
     -- kludgy as hell
+#if MIN_VERSION_ghc(7,2,0)
+    e <- newHscEnv undefined
+#else
     e <- newHscEnv defaultCallbacks undefined
+#endif
+
initTcRnIf 'r' e undefined undefined (readBinIface IgnoreHiWay QuietBinIFaceReading hi_path)

 -- TODO need a loadPackage p package.conf :: IO () primitive
@@ -679,7 +686,11 @@

                 -- and find some packages to load, as well.
                 let ps = dep_pkgs ds
+#if MIN_VERSION_ghc(7,2,0)
+ ps' <- filterM loaded . map packageIdString . nub $ map fst ps
+#else
                 ps' <- filterM loaded . map packageIdString . nub $ ps
+#endif

 #if DEBUG
                 when (not (null ps')) $

On 12/30/11 4:32 PM, Brian Victor wrote:
Hi all,

As a getting-my-feet-wet project I was starting to look into using
plugins-auto with the yesod devel server, but I was quickly stymied
because the plugins package isn't building on GHC 7.2. The error I get
locally is the same as the one reported by hackage[1]. In short,
defaultCallbacks seems to be gone from 7.2.

It doesn't look like that function has simply been moved. So can someone
give me an idea about how to proceed?

Thanks!

[1]
http://hackage.haskell.org/packages/archive/plugins/1.5.1.4/logs/failure/ghc-7.2





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