anchor.diff:    propagatedBuildInputs = [
       pyannotate
     ];
  +
  +  postPatch = ''
  +    substituteInPlace setup.py \
  +      --replace "pytest>=3.2.0,<7.0.0" "pytest>=3.2.0"
  +  '';
   
     # Module has no tests
     doCheck = false;
  
positive.code: 
    src = fetchPypi {
      inherit pname version;
      sha256 = "d0da4c3d872a7d5796ac85016caa1da38ae902bebdc759e1b6c0f6f8b5802741";
    };
  
    buildInputs = [
  
negative.code: { lib
  , stdenv
  , buildPythonPackage
  , fetchPypi
  , pyannotate
  