anchor.diff:  { lib
   , boto3
   , buildPythonPackage
  -, enum34
   , fetchFromGitHub
   , jsonschema
   , mock
  
positive.code:     boto3
      jsonschema
      six
    ] ++ lib.optionals (pythonOlder "3.4") [
      enum34
    ];
  
    postPatch = ''
      substituteInPlace pytest.ini \
        --replace " --cov samtranslator --cov-report term-missing --cov-fail-under 95" ""
    '';
  
negative.code:     pyyaml
    ];
  
    disabledTests = [
      # AssertionError: Expected 7 errors, found 9:
      "test_errors_13_error_definitionuri"
    ];
  
    pythonImportsCheck = [
      "samtranslator"
    ];
  
    meta = with lib; {
      description = "Python library to transform SAM templates into AWS CloudFormation templates";
  