anchor.diff:            (import lib/eval-config.nix {
               modules = [ { fileSystems = []; } ];
             }).options;
  -        revision =
  -          if nixosSrc.rev == 1234 then "HEAD" else toString nixosSrc.rev;
  +        revision = toString nixosSrc.rev;
         }).manual;
   
   
  
positive.code:       };
  
  
      manual =
        { officialRelease ? false }:
  
  
negative.code: { nixosSrc ? {outPath = ./.; rev = 1234;}
  , nixpkgs ? {outPath = <nixpkgs>; rev = 5678;}
  }:
  
  let
  
  