anchor.diff:    checkInputs = [
       pytest
     ];
  +
     checkPhase = ''
       runHook preCheck
   
  
positive.code: { buildPythonPackage, fetchFromGitHub, lib, pythonOlder, pytest }:
  buildPythonPackage rec {
    pname = "typed-ast";
    version = "1.5.0";
    src = fetchFromGitHub {
      owner = "python";
      repo = "typed_ast";
      rev = version;
      sha256 = "sha256-z3l5gMG1Jp6EI7SnGn5ABVXVBi+bK///iJBqEWn4d+s=";
    };
    # Only works with Python 3.3 and newer;
    disabled = pythonOlder "3.3";
  
    pythonImportsCheck = [
      "typed_ast"
  
negative.code:     runHook postCheck
    '';
  
    meta = with lib; {
      homepage = "https://github.com/python/typed_ast";
      description = "Python 2 and 3 ast modules with type comment support";
      license = licenses.asl20;
      maintainers = with maintainers; [ SuperSandro2000 ];
    };
  }
  