one flake }:)

flake.nix

@@ -28,6 +28,9 @@
             compiler-nix-name = "ghc912";
             shell = {
               withHoogle = true;
+              inputsFrom = [
+                self.packages.${final.stdenv.hostPlatform.system}.runtime
+              ];
               tools = {
                 cabal = {};
                 haskell-language-server = {};