flake: hide flattenTests prefix accumulator behind inner go function

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: parzivale

flake.nix

@@ -29,21 +29,26 @@
       pkgsFor = system: import sources.nixpkgs { inherit system; };
 
       flattenTests =
-        lib: prefix: tests:
-        builtins.foldl' lib.recursiveUpdate { } (
-          lib.mapAttrsToList (
-            name: value:
-            let
-              key = if prefix == "" then name else "${prefix}-${name}";
-            in
-            if lib.isDerivation value then
-              { ${key} = value; }
-            else if builtins.isAttrs value then
-              flattenTests lib key value
-            else
-              { }
-          ) tests
-        );
+        lib: tests:
+        let
+          go =
+            prefix: attrs:
+            builtins.foldl' lib.recursiveUpdate { } (
+              lib.mapAttrsToList (
+                name: value:
+                let
+                  key = if prefix == "" then name else "${prefix}-${name}";
+                in
+                if lib.isDerivation value then
+                  { ${key} = value; }
+                else if builtins.isAttrs value then
+                  go key value
+                else
+                  { }
+              ) attrs
+            );
+        in
+        go "" tests;
     in
     {
       formatter = forSystems systems (system: (pkgsFor system).nixfmt-tree);
@@ -53,7 +58,7 @@
         let
           pkgs = pkgsFor system;
         in
-        flattenTests pkgs.lib "" (import ./tests { inherit pkgs; })
+        flattenTests pkgs.lib (import ./tests { inherit pkgs; })
       );
 
       finixModules = import ./modules;