anchor.diff:  }:
   buildPythonPackage rec {
     pname = "daphne";
  -  version = "2.1.0";
  +  version = "2.2.2";
   
     disabled = !isPy3k;
   
  
positive.code:     owner = "django";
      repo = pname;
      rev = version;
      sha256 = "1lbpn0l796ar77amqy8dap30zxmsn6as8y2lbmp4lk8m9awscwi8";
    };
  
    nativeBuildInputs = [ pytestrunner ];
  
negative.code: 
    checkInputs = [ hypothesis pytest pytest-asyncio ];
  
    doCheck = !stdenv.isDarwin; # most tests fail on darwin
  
    checkPhase = ''
      py.test
    '';
  
    meta = with stdenv.lib; {
  