anchor.diff:  
   
       manual =
  -      { nixosSrc ? {outPath = ./.; rev = 1234;}
  -      , officialRelease ? false
  -      }:
  +      { officialRelease ? false }:
   
         (import "${nixosSrc}/doc/manual" {
           pkgs = import <nixpkgs> {};
  
positive.code: 
  
      tarball =
        { nixosSrc ? {outPath = ./.; rev = 1234;}
        , officialRelease ? false
        }:
  
        with import <nixpkgs> {};
  
  
negative.code: 
    makeSystemTarball =
      { module, maintainers ? ["viric"]}:
      { officialRelease ? false
      , system ? "i686-linux"
      }:
  
  