temp

source/recipes/devshell/env-var/tempwork/flake.nix

@@ -8,12 +8,13 @@
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = import nixpkgs { inherit system; };
-        customGhc = pkgs.haskellPackages.ghcWithPackages (p: with p; [ p.extra ]);
       in
       {
         devShells = rec {
           default = pkgs.mkShell {
-	          buildInputs = [ customGhc ];
+            shellHook = ''
+              export FOO="bar"
+            '';
           };
         };
       }

source/recipes/devshell/haskell-pkg/tempwork/Main.hs

@@ -1,6 +0,0 @@
-import Data.List.Extra
-
-main :: IO ()
-main = do
-  print $ lower "ABCDE"
-  print $ upper "XYZ"