testers.testBuildFailure': use default.nix and move recurseIntoAttrs into tests.nix

pkgs/build-support/testers/default.nix

@@ -37,7 +37,7 @@
   # See https://nixos.org/manual/nixpkgs/unstable/#tester-testBuildFailurePrime
   # or doc/build-helpers/testers.chapter.md
   # NOTE: Must be `import`-ed rather than `callPackage`-d to preserve the `override` attribute.
-  testBuildFailure' = import ./testBuildFailurePrime/tester.nix { inherit lib stdenvNoCC testers; };
+  testBuildFailure' = import ./testBuildFailurePrime { inherit lib stdenvNoCC testers; };
 
   # See https://nixos.org/manual/nixpkgs/unstable/#tester-testEqualDerivation
   # or doc/build-helpers/testers.chapter.md

pkgs/build-support/testers/testBuildFailurePrime/tests.nix

@@ -1,12 +1,14 @@
 {
   emptyDirectory,
   hello,
+  lib,
   overrideStructuredAttrs,
   runCommand,
   stdenvNoCC,
   testers,
 }:
 let
+  inherit (lib.attrsets) recurseIntoAttrs;
   final = {
     # NOTE: This example is used in the docs.
     # See https://nixos.org/manual/nixpkgs/unstable/#tester-testBuildFailurePrime
@@ -144,4 +146,4 @@ let
     logNegativeTestStructuredAttrs = overrideStructuredAttrs true final.logNegativeTest;
   };
 in
-final
+recurseIntoAttrs final