Remove overlays.

Author: dmjio

default.nix

@@ -1,25 +1,12 @@
 with (builtins.fromJSON (builtins.readFile ./nixpkgs.json));
-let
-  haskellOverlay = self: super: with super.haskell.lib; {
-    cabal2nix = (self.haskellPackages.override {
-      overrides = self: super: {
-        network = dontCheck (super.network);
-        network_3_1_1_1 = dontCheck (super.network_3_1_1_1);
-      };
-    }).cabal2nix;
-  };
-in
 { pkgs ? import (builtins.fetchTarball {
     url = "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";
     inherit sha256;
-  }) { overlays = [ ]; }
+  }) {}
 , compiler ? "ghc881"
 }:
 let
-  overrides = with pkgs.haskell.lib;
-    self: super: {
-      Diff = self.Diff_0_4_0;
-    };
+  overrides = self: super: { Diff = self.Diff_0_4_0; };
   ghc = pkgs.haskell.packages.${compiler}.override { inherit overrides; };
   language-ecmascript = ghc.callCabal2nix "language-ecmascript" ./. {};
 in