anchor.diff:  { lib
   , buildPythonPackage
   , fetchPypi
  +, pythonOlder
   , sphinx
   , mock
  -, coverage
  -, unittest2
  +, repeated-test
  +, unittestCheckHook
   , attrs
  -, funcsigs
  -, six
   , setuptools-scm
   }:
   
  
positive.code:   pname = "sigtools";
    version = "4.0.1";
    format = "pyproject";
  
    src = fetchPypi {
      inherit pname version;
  
negative.code:     attrs
    ];
  
    checkInputs = [
      mock
      repeated-test
      sphinx
      unittestCheckHook
    ];
  
    meta = with lib; {
      description = "Utilities for working with 3.3's inspect.Signature objects.";
  