anchor.diff:        };
   
       tests = 
  -      { nixos ? /etc/nixos/nixos
  -      , disnix ? (import ../../disnix/trunk/release.nix {}).build {}
  -      }:
  +      { nixos ? /etc/nixos/nixos }:
         
         let
           dydisnix = build { system = "x86_64-linux"; };
  
positive.code:     build =
        { tarball ? jobs.tarball {}
        , system ? "x86_64-linux"
        , disnix ? (import ../../disnix/trunk/release.nix {}).build {}
        }:
  
        with import nixpkgs { inherit system; };
  
negative.code: { nixpkgs ? /etc/nixos/nixpkgs 
  , disnix #? (import ../../disnix/trunk/release.nix {}).build {}
  }:
  
  let
    jobs = rec {
      tarball =
        { dydisnix ? {outPath = ./.; rev = 1234;}
        , officialRelease ? false
        }:
  
        with import nixpkgs {};
  