anchor.diff:  
   buildPythonPackage rec {
     pname = "pyzerproc";
  -  version = "0.4.6";
  +  version = "0.4.8";
     disabled = pythonOlder "3.6";
   
     src = fetchFromGitHub {
       owner = "emlove";
       repo = pname;
       rev = version;
  -    sha256 = "1qlxvvy9fyff56dvc46nsd5ngkxqhdi7s4gwfndj7dn76j81srpq";
  +    sha256 = "sha256-PNvkgjPcBbnETjWpVF3De9O9IprdpCke0nWvJ9Tju1M=";
     };
   
  -  # Remove pytest-runner, https://github.com/emlove/pyzerproc/pull/1
  -  patchPhase = ''
  -    substituteInPlace setup.py --replace "'pytest-runner'," ""
  +  postPatch = ''
  +    sed -i "/--cov/d" setup.cfg
     '';
   
     propagatedBuildInputs = [
  
positive.code:   ];
  
    checkInputs = [
      asynctest
      pytest-asyncio
      pytest-cov
      pytest-mock
      pytestCheckHook
    ];
  
    pythonImportsCheck = [ "pyzerproc" ];
  
negative.code: , buildPythonPackage
  , fetchFromGitHub
  , pytest-asyncio
  , pytest-mock
  , pytestCheckHook
  , pythonOlder
  