add simplest possible shell.nix to get ghc-9.10, cabal anc z3

Author: ulysses4ever

shell.nix

@@ -1,20 +1,9 @@
-let
-  pkgs = import (builtins.fetchGit {
-                   name = "nixos-git";
-                   url = "https://github.com/nixos/nixpkgs/";
-                   ref = "refs/heads/master";
-                   # Commit hash for nixos-unstable as of 2021-12-01
-                   # # rev = "8b01281b66cba818abea8dbbdb3614b1b38961e3";
-                   rev = "c610be58c0b6484c18728dc3ed60310cdbfbd456";
-                 }) {};
-  ghc = pkgs.haskell.compiler.ghc8107;
-  ghc901 = pkgs.haskell.compiler.ghc901;
-  stdenv = pkgs.overrideCC pkgs.stdenv pkgs.gcc7;
-  gcc = pkgs.gcc7;
-in
-  with pkgs;
-  stdenv.mkDerivation {
-    name = "lh-array-sort";
-    buildInputs = [ ghc ghc901 cabal-install stack ghcid z3 numactl
-                    stdenv gcc gdb uthash ];
-  }
+{ compiler ? "ghc910", pkgs ? import <nixpkgs> {}, ... }:
+pkgs.mkShell {
+  name = "haskell-shell";
+  buildInputs = [
+    pkgs.haskell.compiler.${compiler}
+    pkgs.haskell.packages.${compiler}.cabal-install
+    pkgs.z3
+    ];
+}