Add mold to darwin

home-manager/darwin/default.nix

@@ -14,6 +14,7 @@ with nLib; {
     ../common/programs/terminal.nix
     ./programs/core.nix
     ./programs/emacs.nix
+    ./programs/devel.nix
   ];
 
   options = {

home-manager/darwin/programs/devel.nix

@@ -0,0 +1,21 @@
+{ config, lib, pkgs, inputs, ... }:
+let
+  devel = config.nathan.programs.devel;
+  unstable = inputs.nixpkgs-unstable.legacyPackages."${pkgs.system}";
+  inherit (import ../../../modules/lib.nix {
+    inherit lib;
+    inherit pkgs;
+  })
+    nLib;
+
+in with lib;
+with nLib; {
+  config = mkMerge [
+    # Core development utilites
+    (mkIf devel.core {
+      home.packages = with pkgs;
+      # Experimental mold!
+        [ unstable.mold ];
+    })
+  ];
+}