anchor.diff: -{ lib, buildPythonPackage, fetchPypi, pythonOlder
  +{ lib
  +, bash
  +, buildPythonPackage
  +, chardet
   , docker
  +, entrypoints
   , escapism
  +, fetchFromGitHub
  +, iso8601
   , jinja2
   , pkgs-docker
   , python-json-logger
  +, pythonOlder
   , pyyaml
   , ruamel_yaml
   , semver
  
positive.code:   ];
  
    meta = with lib; {
      homepage = "https://repo2docker.readthedocs.io/en/latest/";
      description = "Repo2docker: Turn code repositories into Jupyter enabled Docker Images";
      license = licenses.bsdOriginal;
      maintainers = [ maintainers.costrouc ];
    };
  }
  
negative.code:     traitlets
    ];
  
    # Tests require a running Docker instance
    doCheck = false;
  
    pythonImportsCheck = [
  