From a601787e55c50ca6805a34e5e5190a3943cfb00b Mon Sep 17 00:00:00 2001
From: Bas van Dijk <v.dijk.bas@gmail.com>
Date: Sun, 10 Jun 2018 12:32:20 +0200
Subject: [PATCH] haskell: fix overriding haskellPackages using
 haskell.packageOverrides

Tested using:

$ nix-build -E '(import ./. { overlays = [(final : previous : { haskell = previous.haskell // { packageOverrides = self : super : {blablabla = super.scientific;};};})];}).haskellPackages.blablabla'
/nix/store/s75xbfhn88187jk8238h4ii2ap9kg4m2-scientific-0.3.6.2
---
 pkgs/top-level/all-packages.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index bc48df43f404..db65cd4a9b86 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6460,7 +6460,7 @@ with pkgs;
   haskell = callPackage ./haskell-packages.nix { };
 
   haskellPackages = haskell.packages.ghc822.override {
-    overrides = config.haskellPackageOverrides or (self: super: {});
+    overrides = config.haskellPackageOverrides or haskell.packageOverrides;
   };
 
   inherit (haskellPackages) ghc;