overlay.nix: also override the ghc841 package set

basvandijk · basvandijk · commit 385dab874e77 · 2018-04-02T13:40:11.000+02:00
diff --git a/overlay.nix b/overlay.nix
@@ -12,10 +12,10 @@ let
 in  {
   haskellPackages = previous.haskellPackages.override haskellOverrides;
   haskell = previous.haskell // {
-    packages = previous.haskell.packages // {
-      ghc802 = previous.haskell.packages.ghc802.override haskellOverrides;
-      ghc822 = previous.haskell.packages.ghc822.override haskellOverrides;
-    };
+    packages = previous.haskell.packages //
+      previous.lib.genAttrs [ "ghc802" "ghc822" "ghc841" ] (compiler:
+        previous.haskell.packages.${compiler}.override haskellOverrides
+      );
   };
 
   opencv3 = previous.opencv3.override {
