anchor.diff:      inherit pname version;
       sha256 = "9f0cbcc36e08c2c4ae90d02d3d1f9a62231f974bcbc1df85e8045946d8261059";
     };
  -}+
  +  meta = with lib; {
  +    description = "Virtualenv-based automation of test activities";
  +    homepage = https://tox.readthedocs.io/;
  +    license = licenses.mit;
  +  };
  +}
  
positive.code:   version = "3.1.2";
  
    buildInputs = [ setuptools_scm ];
    propagatedBuildInputs = [ py virtualenv pluggy six ];
  
    doCheck = false;
  
  
negative.code: { lib
  , buildPythonPackage
  , fetchPypi
  , packaging
  , pluggy
  , py
  , six
  , virtualenv
  , setuptools_scm
  }:
  
  buildPythonPackage rec {
  