top-level/stage: assert no by-name overwrites (#483820)

          overlays

          ;

      } res self super;

      conflictingAttrs = lib.intersectAttrs res super;

    in

    assert lib.assertMsg (conflictingAttrs == { })

      "The following attributes were defined both in `pkgs/top-level/all-packages.nix` and elsewhere, most likely in `pkgs/by-name/`: ${lib.concatStringsSep ", " (lib.attrNames conflictingAttrs)}";

    res;

  aliases = self: super: lib.optionalAttrs config.allowAliases (import ./aliases.nix lib self super);