TMP COMMIT: fix 2743c19

TODO: use `recursiveUpdate`

Author: runeksvendsen

default.nix

@@ -2,15 +2,25 @@
 , compiler ? "ghc90"
 }:
 let
+  # Trick I learned from https://nix.dev/guides/best-practices.html#updating-nested-attribute-sets
+  # TODO:
+  #  pkgs.lib.recursiveUpdate { a = { b = 1; }; } { a = { c = 3;}; }
+
   nixpkgs =
     nixpkgsRaw //
-      { haskellPackages =
-          nixpkgsRaw.haskellPackages.override {
-            overrides = self: super: {
-              statistics = self.haskell.lib.dontCheck super.statistics;
-              flatparse = self.haskell.lib.dontCheck super.flatparse;
+      { pkgs = nixpkgsRaw.pkgs //
+        { haskell = nixpkgsRaw.pkgs.haskell //
+          { packages = nixpkgsRaw.pkgs.haskell.packages //
+            { "${compiler}" =
+                nixpkgsRaw.pkgs.haskell.packages.${compiler}.override {
+                  overrides = self: super: {
+                    statistics = nixpkgsRaw.pkgs.haskell.lib.dontCheck super.statistics;
+                    flatparse = nixpkgsRaw.pkgs.haskell.lib.dontCheck super.flatparse;
+                  };
+                };
             };
           };
+        };
       };
 
   bellman-ford =