anchor.diff:    checkInputs = [
       black
       isort
  -    pytest
  +    pytestCheckHook
     ];
   
     preCheck = ''
  
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:   SETUPTOOLS_SCM_PRETEND_VERSION = version;
  
    nativeBuildInputs = [
      setuptools-rust
      setuptools-scm
      rustPlatform.cargoSetupHook
    ] ++ (with rustPlatform; [ rust.cargo rust.rustc ]);
  
    propagatedBuildInputs = [
      hypothesis
  