anchor.diff:  }:
   
   let
  -  version = "3.30.2";
  +  version = "3.31";
   
     baseUrl = "https://ftp.mozilla.org/pub/mozilla.org/security/nss/releases"
       + "/NSS_${stdenv.lib.replaceStrings ["."] ["_"] version}_RTM/src";
  
positive.code: 
    passthru = {
      inherit version;
    };
  
    meta = with stdenv.lib; {
  
negative.code: 
    src = fetchurl {
      url = "${baseUrl}/${name}.tar.gz";
      hashOutput = false;
      sha256 = "e90561256a3271486162c1fbe8d614d118c333d36a4455be2af8688bd420a65d";
    };
  
    buildInputs = [
  