gistfile1.txt

diff --git a/pkgs/top-level/stage.nix b/pkgs/top-level/stage.nix
index 06978d1067b..86c30014233 100644
--- a/pkgs/top-level/stage.nix
+++ b/pkgs/top-level/stage.nix
@@ -172,6 +172,13 @@ let
   ] ++ overlays ++ [
     stdenvOverrides ]);
 
+  mapIt = path: attrs:
+    lib.mapAttrs (name: value:
+      builtins.trace (lib.concatStringsSep "." (path ++ [name]))
+      (if lib.isDerivation value then value
+      else if lib.isAttrs value then mapIt (path ++ [name]) value
+      else value)
+    ) attrs;
 in
   # Return the complete set of packages.
-  lib.fix toFix
+  lib.fix (x: mapIt [] (toFix x))