anchor.diff:  
         # A Nixpkgs overlay that overrides the 'nix' and
         # 'nix.perl-bindings' packages.
  -      overlay = overlayFor (p: p.stdenv);
  +      overlays.default = overlayFor (p: p.stdenv);
   
         hydraJobs = {
   
  
positive.code:         tests.remoteBuilds = import ./tests/remote-builds.nix {
            system = "x86_64-linux";
            inherit nixpkgs;
            inherit (self) overlay;
          };
  
          tests.nix-copy-closure = import ./tests/nix-copy-closure.nix {
            system = "x86_64-linux";
            inherit nixpkgs;
            inherit (self) overlay;
          };
  
          tests.nssPreload = (import ./tests/nss-preload.nix rec {
            system = "x86_64-linux";
            inherit nixpkgs;
            inherit (self) overlay;
          });
  
          tests.githubFlakes = (import ./tests/github-flakes.nix rec {
            system = "x86_64-linux";
            inherit nixpkgs;
            inherit (self) overlay;
          });
  
          tests.sourcehutFlakes = (import ./tests/sourcehut-flakes.nix rec {
            system = "x86_64-linux";
            inherit nixpkgs;
            inherit (self) overlay;
          });
  
          tests.setuid = nixpkgs.lib.genAttrs
  
negative.code:           (system:
              import ./tests/setuid.nix rec {
                inherit nixpkgs system;
                overlay = self.overlays.default;
              });
  
          # Make sure that nix-env still produces the exact same result
  