diff --git a/nixos/modules/services/x11/display-managers/default.nix b/nixos/modules/services/x11/display-managers/default.nix
index 6945a241f92..9fdbe753dad 100644
--- a/nixos/modules/services/x11/display-managers/default.nix
+++ b/nixos/modules/services/x11/display-managers/default.nix
@@ -444,8 +444,8 @@ in
       in
         # We will generate every possible pair of WM and DM.
         concatLists (
-          crossLists
-            (dm: wm: let
+            builtins.map
+            ({dm, wm}: let
               sessionName = "${dm.name}${optionalString (wm.name != "none") ("+" + wm.name)}";
               script = xsession dm wm;
               desktopNames = if dm ? desktopNames
@@ -472,7 +472,7 @@ in
                   providedSessions = [ sessionName ];
                 })
             )
-            [dms wms]
+            (cartesianProductOfSets { dm = dms; wm = wms; })
           );
 
     # Make xsessions and wayland sessions available in XDG_DATA_DIRS
diff --git a/nixos/tests/predictable-interface-names.nix b/nixos/tests/predictable-interface-names.nix
index bab091d57ac..c0b472638a1 100644
--- a/nixos/tests/predictable-interface-names.nix
+++ b/nixos/tests/predictable-interface-names.nix
@@ -5,7 +5,11 @@
 
 let
   inherit (import ../lib/testing-python.nix { inherit system pkgs; }) makeTest;
-in pkgs.lib.listToAttrs (pkgs.lib.crossLists (predictable: withNetworkd: {
+  testCombinations = pkgs.lib.cartesianProductOfSets {
+    predictable = [true false];
+    withNetworkd = [true false];
+  };
+in pkgs.lib.listToAttrs (builtins.map ({ predictable, withNetworkd }: {
   name = pkgs.lib.optionalString (!predictable) "un" + "predictable"
        + pkgs.lib.optionalString withNetworkd "Networkd";
   value = makeTest {
@@ -30,4 +34,4 @@ in pkgs.lib.listToAttrs (pkgs.lib.crossLists (predictable: withNetworkd: {
       machine.${if predictable then "fail" else "succeed"}("ip link show eth0")
     '';
   };
-}) [[true false] [true false]])
+}) testCombinations)
diff --git a/pkgs/os-specific/solo5/default.nix b/pkgs/os-specific/solo5/default.nix
index 2dbeca98051..19d1aa3b5eb 100644
--- a/pkgs/os-specific/solo5/default.nix
+++ b/pkgs/os-specific/solo5/default.nix
@@ -50,10 +50,11 @@ in stdenv.mkDerivation {
     homepage = "https://github.com/solo5/solo5";
     license = licenses.isc;
     maintainers = [ maintainers.ehmry ];
-    platforms = lib.crossLists (arch: os: "${arch}-${os}") [
-      [ "aarch64" "x86_64" ]
-      [ "freebsd" "genode" "linux" "openbsd" ]
-    ];
+    platforms = builtins.map ({arch, os}: "${arch}-${os}")
+      (cartesianProductOfSets {
+        arch = [ "aarch64" "x86_64" ];
+        os = [ "freebsd" "genode" "linux" "openbsd" ];
+      });
   };
 
 }