anchor.diff:  
   buildPythonPackage rec {
     pname = "python-can";
  -  version = "unstable-2022-01-11";
  +  version = "4.0.0";
     format = "setuptools";
   
     disabled = pythonOlder "3.6";
  
positive.code:     # Tests require access socket
      "BasicTestUdpMulticastBusIPv4"
      "BasicTestUdpMulticastBusIPv6"
    ];
  
    preCheck = ''
  
negative.code:   src = fetchFromGitHub {
      owner = "hardbyte";
      repo = pname;
      rev = version;
      hash = "sha256-/z7zBfVbO7x4UtzWOXolH2YrtYWgsvRLObWwz8sqOEc=";
    };
  
    propagatedBuildInputs = [
  