anchor.diff:    };
     guiPreview = mkGui {
       stable = false;
  -    sha256Hash = "1frfhys5s5lnqzk216y3wj2pli5g3b5imfzcmddxdcibksx13i17";
  +    sha256Hash = "0yc5lr01xb7lk4dsrwx79mimbr91vldpvqbrx37j3kym6p5m84cn";
     };
   
     serverStable = mkServer {
  
positive.code: 
  let
    stableVersion = "2.0.3";
    previewVersion = "2.1.0rc2";
    addVersion = args:
      let version = if args.stable then stableVersion else previewVersion;
          branch = if args.stable then "stable" else "preview";
  
negative.code:   };
    serverPreview = mkServer {
      stable = false;
      sha256Hash = "1lac88d9cmlhrwmlvxv1sk86600rwznw3lpsm440bax6qbdfcis3";
    };
  }
  