anchor.diff:  , fetchFromGitHub
   , hypothesis
   , isort
  -, pytest
  +, pytestCheckHook
   , python
   , pythonOlder
   , pyyaml
  +, rustPlatform
  +, setuptools-rust
   , setuptools-scm
   , typing-extensions
   , typing-inspect
  
positive.code:     owner = "instagram";
      repo = pname;
      rev = "v${version}";
      sha256 = "1r4aiqpndqa75119faknsghi7zxyjrx5r6i7cb3d0liwiqrkzrvx";
    };
  
    postPatch = ''
      # test try to format files, which isn't necessary when consuming releases
  
negative.code: 
  buildPythonPackage rec {
    pname = "libcst";
    version = "0.4.1";
    format = "pyproject";
  
    disabled = pythonOlder "3.6";
  
  