Update default Haskell compiler from GHC 7.8.3 to 7.8.4.

pkgs/development/compilers/ghc/7.8.3.nix

@@ -1,44 +0,0 @@
-{ stdenv, fetchurl, ghc, perl, gmp, ncurses }:
-
-stdenv.mkDerivation rec {
-  version = "7.8.3";
-  name = "ghc-${version}";
-
-  src = fetchurl {
-    url = "http://www.haskell.org/ghc/dist/7.8.3/${name}-src.tar.xz";
-    sha256 = "0n5rhwl83yv8qm0zrbaxnyrf8x1i3b6si927518mwfxs96jrdkdh";
-  };
-
-  buildInputs = [ ghc perl gmp ncurses ];
-
-  enableParallelBuilding = true;
-
-  buildMK = ''
-    libraries/integer-gmp_CONFIGURE_OPTS += --configure-option=--with-gmp-libraries="${gmp}/lib"
-    libraries/integer-gmp_CONFIGURE_OPTS += --configure-option=--with-gmp-includes="${gmp}/include"
-    DYNAMIC_BY_DEFAULT = NO
-  '';
-
-  preConfigure = ''
-    echo "${buildMK}" > mk/build.mk
-    sed -i -e 's|-isysroot /Developer/SDKs/MacOSX10.5.sdk||' configure
-  '' + stdenv.lib.optionalString (!stdenv.isDarwin) ''
-    export NIX_LDFLAGS="$NIX_LDFLAGS -rpath $out/lib/ghc-${version}"
-  '';
-
-  # required, because otherwise all symbols from HSffi.o are stripped, and
-  # that in turn causes GHCi to abort
-  stripDebugFlags = [ "-S" "--keep-file-symbols" ];
-
-  meta = with stdenv.lib; {
-    homepage = "http://haskell.org/ghc";
-    description = "The Glasgow Haskell Compiler";
-    maintainers = [ maintainers.marcweber maintainers.andres maintainers.simons ];
-    inherit (ghc.meta) license;
-    # Filter old "i686-darwin" platform which is unsupported these days.
-    platforms = filter (x: elem x platforms.all) ghc.meta.platforms;
-    # Disable Darwin builds: <https://github.com/NixOS/nixpkgs/issues/2689>.
-    hydraPlatforms = filter (x: !elem x platforms.darwin) meta.platforms;
-  };
-
-}

pkgs/top-level/all-packages.nix

@@ -3352,7 +3352,7 @@ let
     builtins.substring 0 (builtins.stringLength "packages_") name == "packages_"
   ) haskell));
 
-  haskellPackages = haskellPackages_ghc783;
+  haskellPackages = haskellPackages_ghc784;
 
   haskellPackages_ghc6104 = haskell.packages_ghc6104;
   haskellPackages_ghc6123 = haskell.packages_ghc6123;
@@ -3360,10 +3360,9 @@ let
   haskellPackages_ghc722  = haskell.packages_ghc722;
   haskellPackages_ghc742  = haskell.packages_ghc742;
   haskellPackages_ghc763  = haskell.packages_ghc763;
-  haskellPackages_ghc783_no_profiling = recurseIntoAttrs haskell.packages_ghc783.noProfiling;
+  haskellPackages_ghc784_no_profiling = recurseIntoAttrs haskell.packages_ghc784.noProfiling;
-  haskellPackages_ghc783_profiling    = recurseIntoAttrs haskell.packages_ghc783.profiling;
+  haskellPackages_ghc784_profiling    = recurseIntoAttrs haskell.packages_ghc784.profiling;
-  haskellPackages_ghc783              = recurseIntoAttrs haskell.packages_ghc783.highPrio;
+  haskellPackages_ghc784              = recurseIntoAttrs haskell.packages_ghc784.highPrio;
-  haskellPackages_ghc784  = haskell.packages_ghc784;
   haskellPackages_ghcHEAD = haskell.packages_ghcHEAD;
 
   haxe = callPackage ../development/compilers/haxe { };
@@ -9313,7 +9312,7 @@ let
 
   d4x = callPackage ../applications/misc/d4x { };
 
-  darcs = with haskellPackages_ghc783; callPackage ../applications/version-management/darcs {
+  darcs = with haskellPackages_ghc784; callPackage ../applications/version-management/darcs {
     cabal = cabal.override {
       extension = self : super : {
         enableSharedExecutables = false;

pkgs/top-level/haskell-defaults.nix

@@ -19,7 +19,7 @@
     mtl = self.mtl_2_2_1;
   };
 
-  ghc783Prefs = self : super : ghcHEADPrefs self super // {
+  ghc784Prefs = self : super : ghcHEADPrefs self super // {
     cabalInstall_1_20_0_4 = super.cabalInstall_1_20_0_4.override { Cabal = self.Cabal_1_20_0_2; };
     codex = super.codex.override { hackageDb = super.hackageDb.override { Cabal = self.Cabal_1_20_0_2; }; };
     jailbreakCabal = super.jailbreakCabal.override { Cabal = self.Cabal_1_20_0_2; };
@@ -30,7 +30,7 @@
     }; };
   };
 
-  ghc763Prefs = self : super : ghc783Prefs self super // {
+  ghc763Prefs = self : super : ghc784Prefs self super // {
     aeson = self.aeson_0_7_0_4;
     ariadne = super.ariadne.override {
       haskellNames = self.haskellNames.override {
@@ -226,17 +226,10 @@
                };
              };
 
-  packages_ghc783 =
-    packages { ghcPath = ../development/compilers/ghc/7.8.3.nix;
-               ghcBinary = if stdenv.isDarwin then ghc783Binary else ghc742Binary;
-               prefFun = ghc783Prefs;
-             };
-
-
   packages_ghc784 =
     packages { ghcPath = ../development/compilers/ghc/7.8.4.nix;
                ghcBinary = if stdenv.isDarwin then ghc783Binary else ghc742Binary;
-               prefFun = ghc783Prefs;
+               prefFun = ghc784Prefs;
              };
 
   packages_ghc763 =